An electron in a mercury atom jumps from level a to level g by absorbing a single
photon. Determine the energy of the photon in joules.
Answers
Answer:
7.39ev
Explanation:
Energy levels are found inside the atom. Electrons occupy these energy levels depending on the energy they possess. Electrons can move from one energy level to another due to absorption or emission of a photon or other factors. As the electron, jumps from a higher energy level to a lower energy level emitting a photon of measurable frequency, the photon carries energy equal to the amount of energy between the gap of the levels. This idea was first proposed by Neils Bohr and became the forerunner of the wave mechanical model of the atom.
Hence the energy of a photon is the energy of the gap between the two energy levels. Since Ea= 2.48ev and Eg= 10.38 ev.
If an electron jumps from Ea to Eg, the energy of the photon absorbed is given by;
E=Eg-Ea
E= 10.38ev - 2.48ev
E= 7.39ev
Related Questions
describe a cars velocity when it goes around a track at a constant speed
Answers
Answer:
A race car on an oval track has a constant speed. But, as the race car goes around the track, the direction in which the car is moving changes. This means that the velocity of the car is changing. An object has constant velocity if neither the speed nor direction it is moving changes.An eraser is tied to a string swung in a horizontal circle. Identify the type of force which causes this object to travel along a circular path.
Answers
Answer:
A centripetal force
Explanation:
The type of force in the given scenario is tension. The correct option is c.
What is tension force?Tension is defined in physics as the pulling force conveyed axially by a string, cable, loop, or similar material, or by every end of a rod, truss member, or similar three-dimensional object.
Tension can also be defined as the action-reaction pair of forces acting at each end of said elements.
Newton's second law states that the tension in the rope must equal the weight of the backed mass.
Tension, the normal force, and friction are all examples of contact forces.
Since the weight is not moving, the acceleration is zero. Even if the acceleration is not zero, this equals zero.
Thus, the correct option is c.
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Your question seems incomplete, the missing options are:
a) gravityb) appliedc) tensiond) normal5) Apply according to the Law of Universal Gravitation, is there a stronger gravitational force between you and Earth or an elephant and Earth? Why?
Answers
Answer:
Elephant and the eath because Fg is determined by Mass of an object.. So elephant has greater mass therefore, it's Fg is higher
According the universal law of gravitation, the gravitational force is directly proportional to the mass of an object. An elephant weighs so much than a man and thus it will experience larger gravitational force from earth.
What is gravitational force?Gravitational force is a resistive force by which an object attracts other objects towards its centre of mass. The force exerted by the object depends on the mass and the force experienced by the other object depends on its mass and distance between the two objects.
According to universal law of gravitation, the gravitational force is directly proportional to the mass of the object and distance from the ground. The expression for the law is written as:
\(\rm g = G \frac{M_{1} M_{2}}{r^{2}}\)
Where, G is the universal gravitational constant and M1 and M2 be the masses of two objects which and r be the distance between them. As per this relation gravity decreases with increase in distance and increase with an increase in mass.
Therefore, a massive body such as an elephant will experience greater gravitational force from the earth.
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Consider mechanical energy to find the coefficient of friction between the sledge and the ground
Answers
Answer:
0.08
Explanation:
We can represent the situation with the following figure
Now, by the conservation of energy, we can write the following equation
\(\begin{gathered} K_i+U_i-Wnc=K_f \\ \frac{1}{2}mv_i^2+mgh-F_fd=\frac{1}{2}mv_f^2 \end{gathered}\)Where m is the mass, vi is the initial velocity, g is the gravity, h is the height, Ff is the force of friction, d is the distance traveled by the sledge, and vf is the final velocity.
Using the free body diagram, we get that the force of friction is equal to
\(\begin{gathered} F_n=mg\sin60 \\ \text{ Then} \\ F_f=\mu F_n \\ F_f=\mu mg\sin60 \end{gathered}\)Now, we can replace the expression for Ff in the equation above and solve for the coefficient of friction μ
\(\begin{gathered} \frac{1}{2}mv_i^2+mgh-(\mu mg\sin60)d=\frac{1}{2}mv_f^2 \\ \\ \frac{1}{2}v_i^2+gh-\mu gd\sin60=\frac{1}{2}v_f^2 \\ \\ \mu gd\sin60=\frac{1}{2}v_i^2+gh-\frac{1}{2}v_f^2 \\ \\ \mu=\frac{1}{gd\sin60}(\frac{1}{2}v_i^2+gh-\frac{1}{2}v_f^2) \\ \end{gathered}\)Replacing g = 9.8 m/s², d = 16 m, vi = 3 m/s, h = 8 m, and vf = 12 m/s, we get
\(\begin{gathered} \mu=\frac{1}{(9.8)(16)\sin60}(\frac{1}{2}(3)^2+(9.8)(8)-\frac{1}{2}(12)^2) \\ \\ \mu=0.08 \end{gathered}\)Therefore, the coefficient of friction is 0.08
Most car engines have air cooling systems. True or False.
Answers
Answer:
true
hopefully, it's right
Answer:
true
Explanation:
hopefully this is what you needed
a 2.40 kg wooden block is tied to a rope and spun in a circular path of radius 1.08 m. the block obtains a maximum speed of 11.0 m/s. what is the magnitude of the maximum radial acceleration (in m/s2) of the block?
Answers
The maximum radial acceleration of the block is 11.67 m/s2.
What is acceleration ?Acceleration is the rate of change of an object's velocity, which is the speed and direction of its motion. It is defined as the rate of change of velocity with respect to time. Acceleration is often referred to as a vector quantity, as it has both magnitude and direction. A body moving in a straight line with increasing speed is said to be accelerating, while one with decreasing speed is said to be decelerating. Acceleration is a fundamental concept in classical mechanics, and is related to force, mass, and momentum.
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explore how archemides principle is applied in building a ship and submarine
Answers
Answer:
Principle Archimedes is applied in building a ship and submarine using the manipulating that buoyancy, is controlled the ballast tank system.
Explanation:
Submarine is rather had they focused on main parts of the submarine,he is complex and long process implementation,the most submarine design like submarine stability.
Submarine stability is complete and the fundamental Archimedes principle to arrive the weight of submarine is equal to buoyancy force.
Submarine into the parts and components of ballast tank the sequence in diving and surfacing,there two vital parts:- flood parts and air vents
flood parts:- at the bottom position and allow water to enter or leave that tank.
air vents:- air vents at the top of the pressure hall,and that they submarine dive.
this time submarine is most modern system is depth is 300 to 450 meters,high pressure air is 15 bar is tank air valve.
submarine is basic of the effective volume of all the submarine surfaced condition,submarine minus to the free water flood is equal to the fully pressure hull,submarine is the surfaced condition.
Please help me Calculate the total energy stored in the capacitor
Answers
La fórmula: P = W/t ó W = P x t. donde:
P = potencia
W = trabajo
t = tiempo
Otra fórmula de potencia es: P= I x V
Proceso de carga de un capacitor - condensador
Una fórmula muy importante que también hay que tener en cuenta es: V = q/C que indica que el voltaje es proporcional a la carga que hay en un condensador.
De la fórmula de potencia P= I x V y considerando que la corriente es constante (corriente continua), entonces la potencia es proporcional al voltaje. Si el voltaje aumenta en forma lineal, la potencia aumentará igual. Ver el siguiente diagrama.
Como la potencia varía en función del tiempo, no se puede aplicar la fórmula W = P x t, para calcular la energía transferida. Pero observando el gráfico, se ve que esta energía se puede determinar midiendo el área bajo la curva de la figura.
Energía Almacenada en un Condensador - Capacitor
El área bajo la curva es igual a la mitad de la potencia en el momento “t”, multiplicada por “t”.
Entonces: W = (P x t) / 2. Pero se sabe que P = V x I. Si se reemplaza esta última fórmula en la anterior se obtiene: W = (V x I x t) / 2, y como I x t = CV = Q, entonces para saber cuanta energía (W) hay en un condensador usamos una de las siguientes fórmulas:
W = (CV2/2) julios
W = (QV/2) julios
W = (Q2/2C) julios
, donde:
W = Trabajo (Energía) en julios
C = Capacidad en faradios
V = voltaje en voltios en los extremos del condensador
Q = carga del condensador
Answer with the given explanations below: First the given formula that looks like this is: or where:
P = power
W = work
t = time
Next with another given power formula that looks like this is:
This is the charging process of a capacitor - capacitor #1.
Then it's a very important given formula that it must also be taken into account is: which it was indicated that the voltage is proportional to the charge on a capacitor.
In the following below, from the given power formula that looks like this is: and we are considering that the current is the constant (direct current), and then the power is proportional to the voltage. If the voltage increases linearly, the power will increase the same. See the following diagram. (I'm sorry, Yhungbabe, I don't have the diagram to show you in order to refer to the total energy stored in the capacitor because I havenèt learned the energy stored in the capacitor)
Anyway, since the power varies as a function of the time, the given formula that looks like this is: cannot be applied to calculate the energy transferred. But looking at the graph, it seems that this energy can also be determined by measuring the area under the curve of the figure.
This is The Energy Stored in a Capacitor - Capacitor #2.
The area under the curve is equal to the half of the power at time "t", being multiplied by "t".
Then with the given formula below that looks like this is:
But it's known that If this is the last given formula is being replaced in the previous one, we obtain the new given formula that looks like this is: and as another new given formula that looks like this is: there's so to find out how much energy (W) that there's in a capacitor that we use in one of the new given formulas that looks like in the listed below are:
joules
joules
joules
Now finally where:
W = Work (In The Energy) in Joules
C = Capacity in the farads
V = voltage in the volts at the ends of the capacitor
Q = a capacitor charge
I apologize for the late answer and the replies, so anyway, I use the online language translator in order to translate Spanish to English for you in order to understand my work given below, so, I hope my answer with the given explanation below here is very helpful to your own question about how to calculate the total energy stored in the capacitor with the image has been provided, please mark me as Brainliest and have a great rest of the day! :D
Sincerely,
Jason Ta,
The Ambitious of The Brainly And The Role of The TDSB And WHCI Student of The High School.
A specified volume of space contains an electric field for which the magnitude is given by E=E0cos(ωt). Suppose that E0 = 20 V/m and ω = 1.0 × 107 s−1. What is the maximum displacement current through a 0.40 m2 cross-sectional area of this volume?
Answers
Answer: \(0.708\ mA\)
Explanation:
Given
\(E_o=20\ V/m\)
\(\omega =10^7\ s^{-1}\)
Cross-sectional area \(A=0.40\ m^2\)
Current density is given by
\(J=\epsilon_o \dfrac{dE}{dt}\)
Displacement current
\(\Rightarrow I=JA\\\Rightarrow I=8.854\times 10^{-12}\times 20\times 10^7\times 0.4\\\Rightarrow I=0.708\times 10^{-3}\ A\)
The required value of the maximum displacement current of the given space is \(7.08 \times 10^{-4} \;\rm A\).
Given data:
The intensity of electric field is, \(E_{0}=20 \;\rm V/m\).
The angular frequency of electric field is, \(\omega=1.0 \times 10^{7} \;\rm s^{-1}\).
The cross-sectional area of space is, \(A =0.40 \;\rm m^{2}\).
In the given problem, the instantaneous electric field is given by \(E = E_{0} \times cos(\omega t)\)
So, the expression for the current density is,
\(J= \epsilon_{0} \times \dfrac{dE}{dt}\)
Here, \(\epsilon_{0}\) is the permittivity of free space. Solving as,
\(J= \epsilon_{0} \times \dfrac{d(E_{0} \times cos(\omega t))}{dt}\\\\J= -\epsilon_{0} \times E_{0} \times \omega \times sin(\omega t)\)
And the expression for the maximum displacement current is,
\(I = J \times A\)
And the maximum displacement current is possible only when, J is positive and J will be positive for \(sin(\omega t)=-1\).
Then solving as,
\(I = (-\epsilon_{0} \times E_{0} \times \omega \times sin(\omega t)) \times A\\\\I = (-8.85 \times 10^{-12} \times 20 \times (1.0 \times 10^{7}) \times (-1)) \times 0.40\\\\I = 7.08 \times 10^{-4} \;\rm A\)
Thus, we can conclude that the required value of the maximum displacement current of the given space is \(7.08 \times 10^{-4} \;\rm A\).
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Is a structure stable when force is applied in a certain direction?
Answers
Answer:
It can be, but no, mostly it won't be, and it will fall.
Explanation:
When you put force on a structure it will most likely fall unless, it's a big statue.
A boat produces a wave as it passes an aluminum can floating in a lake. Explain why the can merely moves up and down while waves propagate away from the disturbance caused by the boat.
Answers
Answer:
Due to waves.
Explanation:
The can merely moves up and down because the movement of the waves that propagate away from the disturbance caused by the boat. The Can has low density due to low mass and high volume which allow the can to float on the surface of water after prevent it from the drowning. The wave moves the can up and down but prevent it from going deep inside the water so we can say that the can moves due to movement of waves in water.
Are the following forces balanced or unbalanced
25N
10N
10N
25N
Answers
Answer:
The forces are balanced
Explanation:
For an object to be unbalanced, each force has to be in the opposite direction of another force and have equal strength.
Taking a look at this photo:
The left side has a force acting towards the left and a strength of 25 Newtons.The right side has a force acting towards the right and a strength of 25 NewtonsThe bottom has a force acting downwards and a strength of 10 NewtonsThe top has a force acting forward and a strength of 10 Newtons.The forces are balanced because the left and right side both have forces acting in the opposite direction and will equal strength, 25 Newtons.
The same is said about the top and bottom of the rectangle, but the equal strength is 10 Newtons.
Which of the following statements correctly summarizes the events in the early universe according to the Big Bang theory?A. The Big Bang began with the initiation of what we call inflation, which gradually slowed to the current expansion rate of the universe. Forces came to exist for a different reason, having to do with quantum fluctuations in the space-time continuum. Particles came to exist as a result of cracks made when forces froze. Once there were particles, gravity brought them together to make stars, and the stars then turned the particles into hydrogen, helium, and other elements.B. An episode of what we call inflation initiated the event of the Big Bang. Once the Big Bang got underway, particles and forces began to appear one by one. The forces produced protons, which fused to make hydrogen and helium until the universe was about 380,000 years old. Then gravity began to act, turning the hydrogen and helium into galaxies.C. Forces and various subatomic particles began to appear during the first second after the Big Bang. For reasons not understood, the particles were all made of ordinary matter and none were made of antimatter, thus explaining why we live in a universe made of matter. The particles underwent some fusion for the first 380,000 years after the Big Bang, at which time the first stars were born.D. The universe began with the forces unified. During the first fraction of a second, the forces separated and there was a brief but important episode of inflation. Subatomic particles of both matter and antimatter then began to appear from the energy present in the universe. Most of the particles annihilated to make photons, but some became protons, neutrons, electrons, and neutrinos. The protons and neutrons underwent some fusion during the first three minutes, thereby determining the basic chemical composition of the universe.
Answers
The correct statement summarizing the events in the early universe according to the Big Bang theory is option D.
After the forces of the cosmos came together, there was a time of inflation. Then subatomic matter and antimatter particles appeared, the majority of which annihilated to produce photons. Protons, neutrons, electrons, and neutrinos were among the particles that did not decay, though. During the first three minutes, protons and neutrons fused, revealing the universe's basic chemical make-up.
All of the fundamental forces of nature were combined in the early moments of the Big Bang. But the forces split into various interactions as the cosmos grew and contracted. This trend was accompanied by inflation, a rapid expansion. After inflation, a hot, thick soup of energy flooded the entire cosmos.
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A soil with modest CEC of 15 cmol(+)/kg soil has a pH of 6.0. If you took 100 pounds of soil and mixed it with 100 pounds of KCl, the resulting soil would: have a pH near 7.0 have a pH less than 6 have a pH remaining at 6.0 be a moderately alkaline soil (pH 7.5 to 8.5) be calcareous
Answers
When you mix 100 pounds of soil with 100 pounds of KCl, the resulting soil would have a pH near 7.0.
This is because KCl is a neutral salt and does not affect the pH of the soil. The modest CEC of the soil means that it has a relatively low capacity to retain positively charged ions such as K+. Therefore, adding KCl would not significantly affect the pH of the soil. The resulting soil would have a similar pH to the original soil, but it may have a slightly higher pH due to the dilution effect of adding more material. However, the pH increase would be minimal and would not make the soil moderately alkaline (pH 7.5 to 8.5) or calcareous.
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18. all of the following are units of power except (a) watts (b) joules per second (c) electron volts per second (d) newton meters per second (e) kilogram meters per second
Answers
joule is not the unit of power.
In physics, power measures the rate of transfer of electrical energy through a circuit per unit of time. It is denoted by P and is measured using the SI unit of power (watts or 1 joule/second). Electrical energy is usually supplied by batteries and produced by generators. Power refers to the rate per unit of time at which electrical energy is transferred through a circuit. When we talk about units of power, it is joules per second or joules per unit of time. A watt is a unit of electrical power equivalent to 1 ampere under 1 volt of pressure.
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What fraction of chlorine-36 remains UN-decayed after 800,000 years?
Answers
What is the weight of an object (mass = 60 kilograms) on Mars, where the acceleration due to gravity is 3.75 meters/second2?
Answers
Answer:
weight = 225 N
Explanation:
We are asked to calculate the weight of an object of mass 60 kg on Mars given that the acceleration due to gravity (g) on Mars is 3.75 m/s². We can do so using the following formula:
\(\boxed{W = mg}\),
where:
• W = weight of object in Newtons (N)
• m = mass of object in kg
• g = acceleration due to gravity in m/s².
Substituting the given data into the formula above, we can calculate the weight of the object:
W = 60 × 3.75
= 225 N
Therefore the weight of the 60 kg object on Mars is 225 N.
half-wave rectified power is obtained by placing a(n) _____ in one of the ac power lines.
Answers
Half-wave rectified power is obtained by placing a diode in one of the AC power lines.
A diode is an electronic component that allows current to flow in only one direction while blocking it in the opposite direction. By placing a diode in one of the AC power lines, it allows current to flow during half of the AC cycle while blocking it during the other half. This results in half of the waveform being rectified or converted to a unidirectional current.
The rectified output obtained through this arrangement is known as half-wave rectified power. It is commonly used in certain applications where a pulsating DC output is sufficient, such as in some low-power devices or for simple battery charging.
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Determine the hydrostatic force of a circular gate of radius 3m
which is submerged under water.
a). 50m from its center.
b). 50m from its top.
Answers
The hydrostatic force of a circular gate with a radius of 3m submerged under water is determined as follows:
a) The hydrostatic force 50m from its center.
b) The hydrostatic force 50m from its top.
When calculating the hydrostatic force on a submerged object, we use the principle of Pascal's law, which states that the pressure on an object submerged in a fluid is exerted uniformly in all directions. In this case, we are dealing with a circular gate submerged under water.
a) To determine the hydrostatic force 50m from its center, we need to find the depth of the circular gate at that point. The depth can be calculated by subtracting the radius of the gate (3m) from the distance from the center (50m). Therefore, the depth is 47m (50m - 3m). The hydrostatic force can be calculated using the formula F = ρghA, where F is the force, ρ is the density of the fluid (water), g is the acceleration due to gravity, h is the depth, and A is the cross-sectional area of the gate. The cross-sectional area of a circular gate is given by A = πr\(^2\), where r is the radius. Plugging in the values, we get the hydrostatic force.
b) To determine the hydrostatic force 50m from its top, we need to find the depth from the water surface to that point. The depth is equal to the distance from the top (50m). Therefore, the depth is 50m. Using the same formula as above, we can calculate the hydrostatic force.
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Question 22 (1 point) Please select the shapes of galaxies. Irregular Spherical Catical Conical Spiral Elliptical
Answers
The universe has four different types of galaxies: elliptical, spiral, barred spiral, and irregular. Although there are other sorts of galaxies besides these, which are the four primary categories, they are all categorized according to their shapes.
What governs the structure of galaxies?A galaxy's shape is a result of a combination of the gravitational pull of the gas clouds' internal gravity and the spinning gas cloud's centrifugal force. Because of the spinning gas cloud's centrifugal force, all galaxies were born with an elliptical form.
The galaxy has a spiral shape, why?Due to the fact that galaxies rotate around a central axis and due to a phenomenon known as "density waves," astronomers think that galaxies have spiral arms. Galactic density waves are comparable to ocean waves. In a pond, the water doesn't actually move; instead, wave energy moves and changes the water as it passes.
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The current through a piece of lab equipment
must be limited to 2.75 a when it is run by a
120-v dc power supply. what must be the
resistance of this equipment?
Answers
The resistance is approximately 43.64 ohms for the lab equipment to limit the current to 2.75 A.
To calculate the resistance of the lab equipment, we can use Ohm's law, which states that resistance equals voltage divided by current (R = V/I). In this case, we know the current should be limited to 2.75 A and the power supply is 120 V DC. Thus, the resistance can be calculated as follows:
R = V/I = 120/2.75 = 43.64 ohms.
Therefore, the resistance of the lab equipment must be 43.64 ohms in order to limit the current to 2.75 A when it is run by a 120 V DC power supply. It's important to use equipment with the appropriate resistance in order to avoid damaging the equipment or the power supply.
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How many week are in .62 years?
Answers
Answer:
32.32857
Explanation:
Searched on the web
a bus with a mass of 3000kg has a force of 15,000 newtons applied to it while traveling down the highway. what is the resulting acceleration on the bus?
Answers
Answer:
5m/s^2
Explanation:
acceleration= force/ mass
a = 15,000/3000
a = 5m/s^2
Answer:
uqvajwvabab
Explanation:
hiusbsvbskws wjq d wbsbb akwbwbs
If the mass of both vehicles were doubled, how would the final velocity and the change in kinetic energy be affected?
-The change in kinetic energy would be 2 times as great.
-The final velocities would each have the same magnitude as before
Answers
The kinetic energy of the vehicles would double, and the mass would also double, the change in kinetic energy would be twice as great as it was before.
Explanation:-
The change in kinetic energy would be 2 times as great and the final velocities would each have the same magnitude as before if the mass of both vehicles were doubled.
The law of conservation of energy states that the change in kinetic energy of an object is equal to the work done on it. Kinetic energy is directly proportional to mass and the square of the velocity;
thus, the final velocity and the change in kinetic energy can be determined as follows:
KE = (1/2)mv²,
where KE is the kinetic energy, m is the mass, and v is the velocity.
When the mass of both vehicles is doubled, it is expected that their final velocities would each have the same magnitude as before.
According to Newton's Second Law, the acceleration is inversely proportional to the mass when the force remains constant.
F = ma,
where F is the force, m is the mass, and a is the acceleration.
The magnitude of the force acting on each vehicle would be constant,
so the acceleration would be inversely proportional to the mass.
As a result, the final velocities would each have the same magnitude as before.
Mathematically,
v = √(2KE/m)
Since the kinetic energy of the vehicles would double, and the mass would also double, the change in kinetic energy would be twice as great as it was before.
Therefore, the change in kinetic energy would be 2 times as great.
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A pair of wires support a heavy painting. Tension in the wires is greater when they are
A)vertical.
B)not vertical.
C)the same regardless of the wire orientation.
D)none of the above
Answers
The tension in the wires is greater when they are not vertical (option B).
When the wires are vertical, they are only supporting the weight of the painting, which is acting straight down due to gravity.
However, when the wires are at an angle, they are not only supporting the weight of the painting but also providing a force to counteract the component of the weight that is acting perpendicular to the direction of the wires.
This means that the wires are under more tension when they are at an angle than when they are vertical.
In other words, the tension in the wires is directly proportional to the angle between the wires and the vertical direction.
The greater the angle, the greater the tension in the wires. This is why it is important to use an appropriate angle when hanging heavy objects with wires, to ensure that the wires are under enough tension to support the weight without breaking.
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When a race car drives around a circular path, it must accelerate toward the center of the track so it doesn’t hit the outer wall due to what?
a. centripetal force
b. gravitational force
c. friction force
d. momentum
Answers
Answer:
Gravitational Force
Explanation:
If you enter a turn too fast, the front wheels will lose grip and possibly even the back wheels. This happens because of the gravitational force on the car.
a dynamite blast at a quarry launches a rock straight upward, and 2.1 s later it is rising at a rate of 12 m/s. assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b) 4.5 s after launch.
Answers
The rock was launched in the upward direction with an initial velocity of 8.58 m/s.The speed of the rock 4.5 seconds after launch is 35.52 m/s.
Given:
Time after launch (t) = 2.1 s
Rising rate (v) = 12 m/s
(a) By using the equation of motion v = u + at
where,
v denotes the final velocity, u initial velocity, a is the acceleration, and t is the time.
v = u + at
12= u + (9.8) × 2.1 s
u = 12 - (9.8 m/s² × 2.1 s)
u = 12 - 20.58
u = -8.58 m/s
The negative sign indicates that the rock was launched in the upward direction with an initial velocity of 8.58 m/s.
(b) To calculate the speed 4.5 seconds after launch,
v = u + at
v = -8.58 + (9.8) × 4.5 s
v = 35.52 m/s
The speed of the rock 4.5 seconds after launch is 35.52 m/s.
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what type of stars can collapse in a supernova explosion and become neutron stars
Answers
Answer:
red supergiants can
help
Jerry pushes against a solid brick wall as hard as he can, with a force of 500 N. How much work does he do on the wall?
Answers
Explanation:
work = 0
Work is zero because it remains in its place x=0
Briefly explain the circumstances in which velocity and acceleration of a car are
a) parallel
b) anti parallel
Answers
Explanation:
a) Velocity and acceleration of a car are parallel when the car is moving along a straight line in the same direction. For example, when a car is gaining speed as it moves forward in a straight line, both velocity and acceleration are directed in the same direction.
b) Velocity and acceleration of a car are anti-parallel when the car is moving along a straight line in the opposite direction. For example, when a car slows down while moving in a straight line, its acceleration is directed opposite to the direction of its velocity, or the other way around.
Answer:
a)
There is only one case where velocity and acceleration are parallel only when they are moving in the same direction.
b)
There are 3 cases where velocity and acceleration are antiparallel.
(i) When both are moving in different direction
It means :
Either velocity towards +ve direction and acceleration towards -ve direction.Or, velocity towards -ve direction and acceleration towards +ve direction.It is applicable for both 2D (x-y plane) and 3D (x-y-z plane)(ii) When the object is slowing down, where velocity and acceleration are in the opposite direction.
(iii) In case of motion reversal.
Explanation: