________ causes cast of gases to clump together to begin forming new stars and planets.
Answers
Gravity causes cast of gases to clump together to begin forming new stars and planets.
Gravity binds the gas and dust together. If the cluster is large enough, it produces a star—increased pressure from gravitational collapse boosts the temperature, forcing nuclear fusion to occur in its center.
The dust and gases in a nebula are widely dispersed, yet gravity can gradually bring clumps of dust and gas together. As these clusters grow in size, their gravity grows stronger and stronger. The clump of dust and gas eventually becomes so large that it collapses due to its own gravity.
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Related Questions
WORTH 15 POINTS WILL GIVE BRAINLIEST
What is the mechanical advantage of a handle on a water well that requires 5 newtons of force to lift a 40-Newton bucket of water?
200
8
0.125
12.5%
Answers
Option B. The mechanical advantage of a handle on a water well that requires 5 newtons of force to lift a 40-Newton bucket of water is 8.
Mechanical advantage is a measure of the force amplification completed by means of the usage of a device, mechanical tool or gadget device. The device trades off input forces towards motion to gain a preferred amplification in the output pressure.
The version for this is the regulation of the lever. The mechanical advantage is the degree how which tons of force is increased with the aid of using a device or gadget. it is equal to the pressure exerted with the aid of the tool or system divided via the carried-out effort.
calculation:-
Mechanical advantage = load/effort
= 40/5
= 8
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A car speeds up from 4 m/s to 25 m/s in 5 seconds. Calculate its acceleration
Answers
We have:
vi = initial speed = 4 m/s
vf = final speed = 25 m/s
t= time = 5 s
a = acceleration = ?
Apply:
\(a=\frac{vf-vi}{t}\)Replace with the values given:
\(a=\frac{25-4}{5}=4.2\)Answer: 4.2 m/s^2
The Acceleration of the car is 4.2 m/s.
We will use the formula of acceleration.
a = vu - vi / t
Given:
vi = initial speed = 4 m/s
vu = final speed = 25 m/s
t= time = 5 s
a = acceleration = ?
Now, we will put the given values in the formula,
a = vu - vi / t
a = 25 - 4 / 5
a = 21 / 5
a = 4.2 m/s
Therefore, the Acceleration of the car is 4.2 m/s.
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The Hoover dam produces about 4,200,000,000 kWh of energy each year, using flowing water to rotate fan like blades and turbine generators. Which of the following summarizes the production of energy at Hoover dam? 
Answers
The option that summarizes the production of energy at Hoover Dam is A. Mechanical Energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.
How does the Hoover Dam produce electricity ?The Hoover Dam is a hydroelectric dam, which means it generates electricity by harnessing the mechanical energy of flowing water. The dam has a system of turbines that are turned by the flow of water, which then rotates coils of wire in a magnetic field.
This interaction produces an alternating current (AC) electrical signal, which is then transformed into usable electrical energy that can be distributed to power homes and businesses.
In this way, Hoover Dam and other hydroelectric dams generate electricity without producing any greenhouse gas emissions, making them an important source of clean and renewable energy.
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Options for this question are:
Mechanical Energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.Mechanical energy of the flowing water is transformed into thermal energy by rotating coils in a magnetic field, producing a direct current.Thermal energy of the flowing water is transformed into electrical energy by rotating coils in a magnetic field, producing an alternating current.Thermal energy of the flowing water is transformed into mechanical energy by rotating coils in a magnetic field, producing a direct current.A gas mixture contains 0.150 mol of oxygen (o2) gas and 0.211 mol of argon (ar) gas. what is the mole fraction of o2 in the mixture?
Answers
The mole fraction of O2 in the gas mixture, containing 0.150 mol of O2 gas and 0.211 mol of Ar gas, is approximately 0.415
Mole fraction is defined as the ratio of the number of moles of a component to the total number of moles in the mixture.
To calculate the mole fraction of O2 (denoted as X(O2)), we need to determine the total number of moles in the mixture.
Total moles = moles of O2 + moles of Ar
Total moles = 0.150 mol + 0.211 mol
Total moles = 0.361 mol
Now, we can calculate the mole fraction of O2 using the formula:
X(O2) = total moles O2 / total moles
X(O2) = 0.150 mol / 0.361 mol
X(O2) ≈ 0.415
Therefore, the mole fraction of O2 in the gas mixture is approximately 0.415.
The mole fraction of O2 in the gas mixture, containing 0.150 mol of O2 gas and 0.211 mol of Ar gas, is approximately 0.415.
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A uniform electric field of magnitude 380 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 2.90 cm.(a) What is the work done by the field on the electron?
(b) What is the change in potential energy associated with the electron?
(c) What is the velocity of the electron?
Answers
(a) The work done by the field on the electron is -1.04 x 10^-18 J.
(b) The change in potential energy associated with the electron is 1.04 x 10^-18 J.
(c) The velocity of the electron is 1.22 x 10^6 m/s.
(a) The work done by a uniform electric field on a charge is given by the equation W = qEd, where W is the work done, q is the charge, E is the electric field, and d is the distance moved by the charge in the direction of the field. In this case, the charge is an electron with charge -1.6 x 10^-19 C, the electric field is 380 N/C in the positive x-direction, and the distance moved is 2.90 cm = 0.0290 m in the same direction. Substituting these values into the equation gives W = (-1.6 x 10^-19 C)(380 N/C)(0.0290 m) = -1.04 x 10^-18 J.
(b) The change in potential energy associated with the electron is given by the equation ΔU = qΔV, where ΔU is the change in potential energy, q is the charge, and ΔV is the change in potential. Since the electron moves in the direction of the electric field, the change in potential is ΔV = Ed. Substituting the values of q, E, and d from part (a) into the equation gives ΔU = (-1.6 x 10^-19 C)(380 N/C)(0.0290 m) = 1.04 x 10^-18 J.
(c) The work done on the electron by the electric field is equal to the change in the electron's kinetic energy. Using the work-energy theorem, the kinetic energy of the electron can be calculated as KE = W = -1.04 x 10^-18 J. The kinetic energy of the electron is also given by the equation KE = (1/2)mv^2, where m is the mass of the electron and v is its velocity. Solving for v, we get v = √(2KE/m) = 1.22 x 10^6 m/s, where m is the mass of the electron, which is 9.11 x 10^-31 kg.
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How much energy (in joules) does a photon of wavelength 757.7 nm have? (Enter your answ 1.23 x 10-4, you would enter 1.23e-4).
What is the frequency (in Hz) of light that has a wavelength of 110.9 nm
Answers
Answer:
E = h ν = h c / λ
E = (6.63E-34 J-s * 3.00E8 m/s) / 757.7E-9 m
E = 2.62E-19 J
Note 1 eV = 1.60E-19 J
ν = c / λ = 3.00E8 / 110.9E-9 = 2.71E15 / sec
How much energy (in joules) does a photon of wavelength 757.7 nm have.The energy of the photon with a wavelength of 757.7 nm is 2.61 x 10^-19 J. The energy of a photon is given by the formula: E = hc/λwhere E is the energy, h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon.
Substituting the given values, we get: E = (6.626 x 10^-34 J s)(3.00 x 10^8 m/s)/(757.7 x 10^-9 m)E = 2.61 x 10^-19 JTherefore, the energy of the photon with a wavelength of 757.7 nm is 2.61 x 10^-19 J. What is the frequency (in Hz) of light that has a wavelength of 110.9 nm The frequency of light with a wavelength of 110.9 nm is 2.70 x 10^15 Hz. The frequency of light is given by the formula:f = c/λwhere f is the frequency, c is the speed of light, and λ is the wavelength of the light.
Substituting the given values, we get:f = (3.00 x 10^8 m/s)/(110.9 x 10^-9 m)f = 2.70 x 10^15 Hz Therefore, the frequency of light with a wavelength of 110.9 nm is 2.70 x 10^15 Hz. How much energy (in joules) does a photon of wavelength 757.7 nm have.The energy of the photon with a wavelength of 757.7 nm is 2.61 x 10^-19 J. The energy of a photon is given by the formula: E = hc/λwhere E is the energy, h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon.
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What happens to the current in a circuit if a 1.5 volt battery
is removed and is replaced by a 9 volt battery?
Answers
Answer:
the current will improve in performance and tell me if im correct
Energy BalanceTo check if the ANSYS solution satisfies total energy balance, add a Reaction Probe for the left boundary. Make sure to set the thickness to 1m. The thickness is necessary to convert from heat flux to heat flow as discussed in the 2D Conduction module.What is the reaction at the left boundary (in W)? Please input your answer in decimal notation (e.g. 18.65).This reaction value implies that the energy balance for the entire domain is satisfied exactly as discussed under Big Ideas: Finite Element Analysis > Finite Element Solution > Reaction. But we saw that this does not imply that energy balance is satisifed for each element.
Answers
This value will be a decimal number like 18.65 W.
This reaction value implies that the energy balance for the entire domain is satisfied exactly, as discussed under Big Ideas: Finite Element Analysis > Finite Element Solution > Reaction.
To check the energy balance in ANSYS and find the reaction at the left boundary, follow these steps:
Open the ANSYS solution for your problem.
Add a Reaction Probe by selecting "Insert" in the menu, then choose "Probe" and select "Reaction".
In the Details view, set the location to the left boundary of your domain.
Set the thickness to 1m (this converts heat flux to heat flow, as discussed in the 2D Conduction module).
Click on "Update" or "Evaluate All Results" to calculate the reaction at the left boundary.
Now, you should see the reaction value in the Results section, expressed in Watts (W).
This value will be a decimal number like 18.65.
This reaction value implies that the energy balance for the entire domain is satisfied exactly, as discussed under Big Ideas: Finite Element Analysis > Finite Element Solution > Reaction.
However, keep in mind that this does not imply that energy balance is satisfied for each individual element.
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some kinds of pollution in the atmosphere can act to cool the planet by reducing the amount of solar radiation that reaches earth's surface true or false
Answers
True. Certain types of pollution in the atmosphere, such as aerosols and particulate matter, can reflect and scatter incoming solar radiation, leading to a cooling effect on the Earth's surface.
This phenomenon is known as global dimming. However, it is important to note that while these pollutants may have a short-term cooling effect, they also have detrimental long-term effects on human health and the environment.
Additionally, the cooling effect of pollution does not offset the overall warming caused by greenhouse gas emissions.
Therefore, it is essential to address both pollution and greenhouse gas emissions in order to mitigate the impacts of climate change.
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Can you think of a way to explain Hubble's Law other than the
standard Big Bang idea, which includes the concept of a Universe
with no center and no edge?
Answers
An alternative way to explain Hubble's Law without relying on the standard Big Bang idea of a universe with no center and no edge is through the concept of a "tired light" hypothesis.
According to this hypothesis, the redshift observed in distant galaxies is not due to their motion away from us in an expanding universe, but rather the result of photons gradually losing energy as they travel through space.
In the tired light scenario, the wavelength of light is thought to stretch over time due to interactions with matter or other unknown processes. As a result, the light from distant galaxies appears redshifted, mimicking the effect of cosmic expansion. This explanation implies that the universe may have a finite size and a center, challenging the notion of an infinite and uniformly expanding universe.
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3. Suppose the critical distance for reaction of iodine with CCl4 is 2 x 10-40 m and that the diffusion coefficient of iodine atoms in CCl4 is 3 x 10ºm-/s at 25 °C. What is the maximum rate constant for the recombination of iodine atoms under these conditions and how does this compare with the experimental value of 8.2 x 109 1/(Ms)?
Answers
The maximum rate constant for the recombination of iodine atoms under the given conditions is 6.4 x 10²³ 1/(m³·s). It significantly different from the experimental value of 8.2 x 10⁹ 1/(Ms).
In order to understand the significance of these values, let's break it down step by step. The critical distance for reaction, which is the distance at which the reaction becomes probable, is 2 x \(10^{-40}\) m. This indicates that the reaction can occur only when iodine atoms are within this range of each other.
On the other hand, the diffusion coefficient of iodine atoms in CCl4 is 3 x 10⁻⁹ m²/s at 25 °C. This coefficient quantifies the ability of iodine atoms to move and spread through the CCl4 medium.
Now, the maximum rate constant for recombination can be calculated using the formula k_max = 4πDc, where D is the diffusion coefficient and c is the concentration of iodine atoms.
Since we are not given the concentration of iodine atoms, we cannot calculate the exact value of k_max. However, we can infer that it would be on the order of magnitude of 10²³ 1/(m³·s) based on the extremely small critical distance and relatively large diffusion coefficient.
Comparing this estimated value with the experimental value of
8.2 x 10⁹ 1/(Ms), we can see a significant discrepancy. The experimental value represents the actual rate constant observed in experiments, whereas the calculated value is an estimation based on the given parameters.
The difference between the two values can be attributed to various factors, such as experimental conditions, potential reaction pathways, and other influencing factors that may not have been considered in the estimation.
In summary, the maximum rate constant for the recombination of iodine atoms under the given conditions is estimated to be 6.4 x 10²³ 1/(m³·s). This value differs considerably from the experimental value of 8.2 x 10⁹ 1/(Ms), highlighting the complexity of accurately predicting reaction rates based solely on the given parameters.
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at its peak, a tornado is 49.0 m in diameter and carries 315-km/h winds. what is its angular velocity in revolutions per second?
Answers
The tornado has the angular velocity of 0.568 revolutions per second. It is obtained by using the formula for angular velocity.
The formula for angular velocityThe formula for the angular velocity of the tornado can be found by:
ω = v/r
Where
ω = angular velocity v = linear velocityr = radius of a circleWe have a tornado with a diameter of 49.0 m and the linear velocity of wind of 315 km/h. Find the angular velocity in revolutions per second!
Let's find its radius and convert the unit of linear velocity.
The radius of the tornado can be found by dividing its diameter by 2:
r = d/2 = 49.0/2 = 24.5 m
The linear velocity in m/s is
315 km/h = 315 × 1,000 × 1/3,600 m/s
315 km/h = 87.5 m/s
We can rearrange the formula above to solve for angular velocity:
ω = v/r
ω = 87.5 m/s / 24.5 m
ω ≈ 3.57 rad per second
Remember that 1 revolution = 2π radians. So, we get angular velocity in rev per second:
ω = 3.57 rad/s
ω = 3.57/2π
ω ≈ 0.568 rev/s
Hence, the angular velocity of the tornado at its peak is approximately 0.568 revolutions per second.
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A rocket sled of mass 100.0 kg has an engine that is capable of exerting 187.5 W of power. If none of the work done by the engine is lost to friction or drag, and the sled starts at rest, what is the velocity of the sled after one minute?
Answers
The velocity of the sled after one minute is 10.6 m/s.
What is the velocity of the sled?
The velocity of the sled after one minute is calculated by applying Newton's second law of motion and formula instantaneous power as shown below.
P = Fv
where;
P is the powerF is the applied forcev is the velocityP = mav
P = m (v/t)v
P = mv²/t
Pt = mv²
v² = Pt / m
v = √ ( Pt / m )
where;
P is the powerm is the masst is the timeThe velocity of the sled after one minute is calculated as;
v = √ ( 187.5 x 60 / 100 )
v = 10.6 m/s.
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as the change in speed at the boundary of two materials is greater what happened to the angle of refraction (please help )
a. it becomes less
b. it becomes more
c. it stays the same
Answers
Hope this helps.
In a Young's double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to:
D/2
D/2
D2
4D
2D
Answers
Young's double-slit experiment doubles the distance between the slits. The screen-to-slit distance D must be set to 2D to keep the screen's fringe spacing constant.
What does the double-slit in Young's double-slit experiment serve to achieve?This experiment, also known as Young's experiment, measured the effects of coherent waves or particle beams on a screen by passing them through two closely separated slits.
What happens if the space between two slits is widened? What happens to the distance between two consecutive brilliant fringes?Because it depends on L, the spacings between various fringes get smaller as the slit distance gets bigger. Since the space between various fringes is wavelength dependant, increasing the light's wavelength also increases that separation.
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Picture is down below Thank you!
Answers
Hopefully I helped
Answer:
The answer is 45 N to the right.
Explanation:
To find the answer add 25 N and 20 N to get 45 N.
Sound travels slowest through gases _____________________. Group of answer choices because the molecules of gas are close together because gases are air because the molecules of gas are far apart because gases have the lowest temperature
Answers
Why do power plants worry about the resistance of the wires?
( PHYSICAL SCIENCE )
Answers
Answer:
Resistors restrict current flow through a circuit.
(The electrons don't easily get from one side to the other)
High voltage is actually needed for to send power over long distances because if you use high current, a lot of the power is lost to the resistance in the wires.
Explanation:
hope it helps <3
The NEC recommends that voltage drops on branch circuits not exceeding ? at the farthest outlet of power, for heating or lighting loads, will provide for reasonable efficiency of operation.
Answers
The NEC recommends that voltage drops on branch circuits not exceeding 3% at the farthest outlet of power, for heating or lighting loads, will provide for reasonable efficiency of operation.
NEC stands for National Electrical Code. It is the standard for electrical design, installation, inspection, and safety in the United States. The NEC is a model code that has been adopted by many local governments as law.Regarding the question, the NEC recommends that voltage drops on branch circuits not exceeding 3% at the farthest outlet of power for heating or lighting loads. This will provide for reasonable efficiency of operation.In other words, a 3% voltage drop is considered as an appropriate voltage drop limit for branch circuits that supply power to lighting and heating loads. If the voltage drop limit exceeds 3%, it can cause flickering of the lights and/or heating elements not working correctly. So, if the voltage drop is kept below 3%, it will ensure reasonable efficiency of operation.
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A 120 kg box is on the verge of slipping down an inclined plane with an angle of inclination of 47º. What is the coefficient of static friction between the box and the plane?
Answers
Given :
A 120 kg box is on the verge of slipping down an inclined plane with an angle of inclination of 47º.
To Find :
The coefficient of static friction between the box and the plane.
Solution :
Vertical component of force :
\(mg\ sin\ \theta = 120\times 10 \times sin\ 47^\circ{}=877.62 \ N\)
Horizontal component of force(Normal reaction) :
\(mg\ cos\ \theta = 120\times 10 \times cos\ 47^\circ{}=818.40 \ N\)
Since, box is on the verge of slipping :
\(mg\ sin\ \theta= \mu(mg \ cos\ \theta)\\\\\mu = tan \ \theta\\\\\mu = tan\ 47^o\\\\\mu = 1.07\)
Therefore, the coefficient of static friction between the box and the plane is 1.07.
Hence, this is the required solution.
Michael can push down on a lever with a 700 N force. In order to lift a rock using a 2.4 m long bar as a lever, what is the most massive rock that can be lifted if the rock is 30 cm from the fulcrum?
Answers
To find the maximum mass of the rock that can be lifted, we need to use the principle of moments:
Force × distance from the fulcrum (on one side) = Force × distance from the fulcrum (on the other side)
Let's call the force needed to lift the rock Fr and its mass m. We know that Fr = m × g (where g is the acceleration due to gravity, approximately 9.81 m/s²).
The distance from the fulcrum to where Michael applies the force is 2.4 m - 0.3 m = 2.1 m.
So, the equation becomes:
700 N × 2.1 m = Fr × 0.3 m
Solving for Fr:
Fr = (700 N × 2.1 m) / 0.3 m
Fr ≈ 4900 N
Now, we can find the maximum mass of the rock (m):
m = Fr / g
m ≈ 4900 N / 9.81 m/s²
m ≈ 499.49 kg
Therefore, the most massive rock that can be lifted is approximately 499.49 kg.
To solve this problem, we can use the formula for torque: force x distance from fulcrum.
First, we need to convert the distance from the fulcrum to meters: 30 cm = 0.3 m.
The torque produced by Michael's force is:
700 N x 2.4 m = 1680 Nm
In order to lift the rock, the torque produced by Michael's force must be greater than or equal to the torque required to lift the rock.
Let's assume the rock has a mass of m kg. The force required to lift it is the gravitational force acting on it, which is:
F = mg
where g is the acceleration due to gravity (9.8 m/s^2).
The distance from the fulcrum to the rock is 0.3 m, so the torque required to lift the rock is:
F x 0.3 m = mg x 0.3 m
Setting this equal to the torque produced by Michael's force, we have:
1680 Nm = mg x 0.3 m
Solving for m, we get:
m = 1680 Nm / (0.3 m x 9.8 m/s^2) = 191.8 kg
Therefore, the most massive rock that can be lifted with Michael's 700 N force and a 2.4 m lever is approximately 191.8 kg.
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A mass is connected to a spring and is allowed to move horizontally. The mass is at a position L when the spring is unstretched. The mass is then moved, stretching the spring, and released from rest. It then moves with simple harmonic motion. (a) At the instant that the mass passes through the position where the spring is unstretched, what can be said about its instantaneous acceleration? Grade Summary It is maximum. OIt is zero It is non-zero but not maximum Potential per attempt) Hint I give up 1% -ム33% Part (b) At the instant that the mass asses through the position where the spring is unstretched, what can be said about its instantaneous ーム33% Part (c) At the instant that the spring is compressed the most, what can be said about the magnitude of its instantaneous velocity?
Answers
a) The instant that the mass passes through the position where the spring is unstretched, what can be said about its instantaneous acceleration being zero,
c) The instant that the spring is compressed the most, what can be said about the magnitude of its instantaneous velocity of Speed is Zero
a) the equation that governs the simple harmonic motion is
x = A cos (wt +φφ)
Where A is the amplitude of the movement, w is the angular velocity, and φ the initial phase determined by the initial condition
Body acceleration is
a = d²x / dt²
Let's look for the derivatives
dx / dt = - A w sin (wt + φ)
a = d²x / dt² = - A w² cos (wt + φ)
In the instant when it is not stretched x = 0
As the spring is released at maximum elongation, φ = 0
0 = A cos wt
Cos wt = 0 wt = π / 2
Acceleration is valid for this angle
a = -A w² cos π/2 = 0
Acceleration is zero
b)
c) When the spring is compressed x = A
Speed is
v = dx / dt
v = - A w sin wt
We look for time
A = A cos wt
cos wt = 1 wt = 0, π
For this time the speedy vouchers
v = -A w sin 0 = 0
Speed is cero
Harmonic movement refers to the movement of an oscillating mass studies when the restoring pressure is proportional to the displacement, however in contrary directions. Harmonic motion is periodic and may be represented with the aid of a sine wave with regular frequency and amplitude. An example of that is a weight bouncing on a spring. The motion is called harmonic due to the fact musical contraptions make such vibrations that during flip cause corresponding sound waves in the air.
it is a sort of periodic motion with extreme points. simple harmonic motion is an oscillatory motion wherein the particle's acceleration and force are without delay proportional to its displacement from the mean region at every factor. it's miles a special case of oscillatory movement.
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If Europium (Eu) undergoes proton decay and loses 3 protons, which element will it become?
Answers
Answer:
Neodymium (Nd)
Explanation:
An element is made up of atom, which contains three subatomic particles namely; proton, electron, and neutron. In a neutral atom, the number of protons determines the atomic number of that element and the atomic number of an element is the identity of that element in the periodic table.
Hence, a change in the proton number of an element means a change in the atomic number and ultimately a change of that element. In this question, Europium (Eu) element with atomic number, 63, loses three protons. This means that that atom now has 60 protons, which denotes the atomic number of another element called Neodymium (Nd).
Therefore, Europium (Eu) element has become Neodymium (Nd) due to loss of protons.
1. Re-arrange the Ohm’s Law equation to solve the following:I = Type your answers here.R = Type your answers here.2. Power is equal to voltage multiplied by current. Add the missing information in each of the following power equations.P = V Type your answers here.P = R Type your answers here.P = V2 Type your answers here.
Answers
2)
\(\begin{gathered} P=VI \\ P=RI^2 \\ P=\frac{V^2}{R} \end{gathered}\)Explanation
Step 1
Ohm's law states that the strength of a direct current is directly proportional to the potential difference and inversely proportional to the resistance of the circuit.
\(I=\frac{V}{R}\)so
a)
\(I=\frac{V}{R}\)b)
\(\begin{gathered} I=\frac{V}{R} \\ \text{Multiply both sides by R} \\ I\cdot R=R\cdot\frac{V}{R} \\ IR=V \\ \text{divide both sides by I} \\ \frac{RI}{I}=\frac{V}{I} \\ R=\frac{V}{I} \end{gathered}\)Step 2
2
let
Power is equal to voltage multiplied by current.
so
\(P=VI\rightarrow(1)\)also, replacing
\(\begin{gathered} P=VI \\ P=(IR)I \\ P=RI^2\rightarrow(2) \\ \end{gathered}\)also
\(\begin{gathered} V^2=I^2R^2 \\ \text{hece} \\ I^2=\frac{V^2}{R^2} \\ \\ \text{therefore, } \\ P=RI^2\rightarrow(2) \\ P=\frac{V^2}{R^2}\cdot R \\ P=\frac{V^2}{R} \end{gathered}\)I hope this helps you
what region of the solar spectrum can cause a dangerous sunburn
Answers
:
ultraviolet B
Explanation:
Which action best demonstrates the transformation of mechanical energy to heat energy and sound energy?
stretching a string
squeezing a sponge ball
throwing a ball upwards in air
striking a hammer on a nail
Answers
Answer:
striking a hammer on a nail
Answer:
The person above is correct i got it right on my test :)
Explanation:
Section 1: Experimental Overview
Use your answers from questions 1-3 as the basis for the first section of your lab report. This section provides your reader with background information about why you conducted this experiment and how it was completed. Outline the steps of the procedure in full sentences. It also provides potential answers (your hypothesis/es) relative to what you expected the experiment to demonstrate. This section should be 1-3 paragraphs in length.
Answers
Answer:
1-state what the lab is about, that is, what scientific concept (theory, principle, procedure, etc.) you are supposed to be learning about by doing the lab. You should do this briefly, in a sentence or two. If you are having trouble writing the opening sentence of the report, you can try something like: "This laboratory experiment focuses on X…"; "This lab is designed to help students learn about, observe, or investigate, X…." Or begin with a definition of the scientific concept: "X is a theory that…."
2-give the necessary background for the scientific concept by telling what you know about it (the main references you can use are the lab manual, the textbook, lecture notes, and other sources recommended by the lab manual or lab instructor; in more advanced labs you may also be expected to cite the findings of previous scientific studies related to the lab). In relatively simple labs you can do this in a paragraph following the initial statement of the learning context. But in more complex labs, the background may require more paragraphs.
Explanation:
what is a rocket engine that fires against the direction a spacecraft is headed so the spacecraft slows down?
Answers
The rocket engine that fires against the direction a spacecraft is headed so the spacecraft slows down is called Retro engine.
Spacecraft are the space automobiles that might be capable of flying out of doors of the Earth’s ecosystem in the area. They offer us a method of transportation from the Earth to the area and objects in it. There may be numerous spacecraft that are familiar to most of people e.g. Apollo 11 which took Neil Armstrong and his group to the Moon.
Crewed Spacecraft – Crewed spacecraft are the ones that carry people to the area. There have been several crewed spacecraft to the area consisting of Vostok 1 – the first crewed spacecraft in records dispatched by way of the United States of America.
Earth-Orbit Satellites – all of the satellites, which orbit across the Earth, fall in this class. The maximum tremendous satellite in orbit on the Earth is Hubble Telescope.
Space Probe – these are unmanned spacecraft that might be fitted with medical instruments for exploring objects in space e.g. planets, Moon, and solar.
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It takes five hours to drive from Fort Worth to Midland, which is a distance of 300 miles. What
would be the average speed for this trip?
Answers
Answer:
60
Explanation:
(hint: speed = distance/time)
The average speed for this trip will be \(\rm 60 mile\ hr^{-1}\). The ratio of the total distance and time is average velocity.
What is the average speed?The total distance traveled by an object divided by the total time taken is the average speed.
The average speed of an object indicates the pace at which it will traverse a distance. The metric unit of speed is the meter per second.
The given data in the problem is;
t is the time taken = 5 hour
d is the distance tyravelled=300 miles
The average velocity is found as;
\(\rm v_{avg} = \frac{d_{total}}{t{total}} \\\\\ \rm v_{avg} = \frac{300}{5} \\\\ \rm v_{avg} = 60 mile\ hr^{-1}\)
Hence the average speed for this trip will be \(\rm 60 mile\ hr^{-1}\)
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A student wants to make a simple model of the solar system to help him compare how long it would take for a spaceship to travel between different planets.
Which of the following things is essential for him to do in order to think about how long it would take?
this are the opions
He must make sure that the model of each planet looks like the planet it represents, but he does not need to accurately represent the relative distances between the planets because the most important thing is that models look like the thing they are modeling.
He must accurately represent the relative distances between the planets, but he does not need to make sure that the model of each planet looks like the planet it represents because only the relevant aspects of the thing being modeled need to be modeled accurately.
He must accurately represent the relative distances between the planets and also make sure that the model of each planet looks like the planet it represents, because a model should be as much like the thing being modeled as possible.
He does not need to accurately represent the relative distances between the planets, and he does not need to make sure that the model of each planet looks like the planet it represents, because there are always some differences between a model and the thing being modeled.
Answers
Answer:
To make a simple model of the solar system that can be used to compare the time it would take for a spaceship to travel between different planets, the student must accurately represent the relative distances between the planets. This is because the time it would take for a spaceship to travel between two planets depends on the distance between those planets, so accurately representing the distances between the planets is essential for thinking about how long it would take for a spaceship to travel between them.
It is not necessary for the student to make sure that the model of each planet looks like the planet it represents, although this may help make the model more understandable. The most important thing is that the model accurately represents the relative distances between the planets.
In summary, the student must accurately represent the relative distances between the planets in order to think about how long it would take for a spaceship to travel between different planets in the solar system.