If you have 10 grams of a substance that decays with a half-life of 14 days, then how much will you have after 42 days? 1.25 g 2.50 g 3.13 g 6.25 g
Answers
Nt=10 x (0.5)^(42/14)
Nt=1.25 g
Answer:
1.25 g
Explanation:
Related Questions
matter and energy- how are they interrelated?
Answers
Any substance that possesses mass and volume is considered to be matter. In general, atoms and anything composed of them are considered to be "matter."
Energy is the power to effect change or carry out work.
The connection between energy and matter is determined by the speed of light, per the theory of relativity. E = M x C^2, where E is energy, M is mass, and C is the speed of light, describes how matter and energy are related.
Matter and Energy - How are they inter-related?
The variation in a body's mass is inversely proportional to the square of the speed of light and directly correlated with the amount of energy released during the conversion process. An energy conversion process can be carried out by a system using this kind of transformations, in which some of the body's intrinsic energy is converted into thermal energy or radiant light. Also implied by this process is a loss of mass. At the atomic level, the shift of mass is significant because it demonstrates that matter is not an immutable property of the body and that it may, in fact, "disappear," releasing energy to the outside.
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On a day with complete cloud cover, what happens to the visible light headed toward Earth?
(a) The clouds reflect much of it back to space, though some still reaches the surface.
(b) It is absorbed by the clouds, which causes the clouds to heat up.
(c) It reaches the surface just as it does on a cloudless day.
Answers
On a day with complete cloud cover, the visible light headed toward Earth: The clouds reflect much of it back to space, though some still reaches the surface.
When the sun shines, the Earth's atmosphere scatters it in all directions. This is why certain sections of the Earth appear brighter than others during the day—the Sun's light has been reflected off of the ground and other objects. When the planet is completely clouded over, no light reaches Earth at all. The term "nowhere" refers to the fact that there is no such thing as a sunrise since there is no such thing as a dawn. On a cloudy day, visible light directed toward the earth is misdirected and darkened by the clouds. This is due to the fact that shorter wavelengths of visible light scatter more than longer wavelengths. Rayleigh scattering is the name given to this phenomena.
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10 solve the following humeric problem - S. a What is the lift height of salu? T. object energy required to 25 kg to mass of a 10 m.
Answers
\(\boxed{\sf E_P=mgh}\)
\(\\ \sf\longmapsto E_P=25(10)(10)\)
\(\\ \sf\longmapsto E_P=25(100)\)
\(\\ \sf\longmapsto E_P=2500J\)
A single-slit diffraction pattern is formed on a distant screen. If the width of the single-slit is reduced, what happens to the width of the central bright fringe? What happens to the fringe-width if the distance between the slit and the screen is reduced?
Answers
If the width of the slit is reduced, the width of the central bright fringe will increase. If the distance between the slit and the screen is reduced, the fringe-width will increase.
What is occurs in a single-slit diffraction pattern?The width of the central bright fringe in a single-slit diffraction pattern is inversely proportional to the width of the slit. So, if the width of the slit is reduced, the width of the central bright fringe will increase.
The fringe-width is also inversely proportional to the distance between the slit and the screen. So, if the distance between the slit and the screen is reduced, the fringe-width will increase.
To see this, consider the equation for the width of the central bright fringe in a single-slit diffraction pattern:
w = λd / a
where:
w = width of the central bright fringe
λ = wavelength of the light
d = distance between the slit and the screen
a = width of the slit
The width of the central bright fringe is inversely proportional to the width of the slit, a. So, if the width of the slit is reduced, the width of the central bright fringe will increase.
The fringe-width is also inversely proportional to the distance between the slit and the screen, d. So, if the distance between the slit and the screen is reduced, the fringe-width will increase.
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A fish inside the water 12cm below the surface looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 the radius of circle is
Answers
Answer:
13.6 cm
Explanation:
From Snell's law:
n₁ sin θ₁ = n₂ sin θ₂
In the air, n₁ = 1, and light from the horizon forms a 90° angle with the vertical, so sin θ₁ = sin 90° = 1.
Given n₂ = 4/3:
1 = 4/3 sin θ
sin θ = 3/4
If x is the radius of the circle, then sin θ is:
sin θ = x / √(x² + 12²)
sin θ = x / √(x² + 144)
Substituting:
3/4 = x / √(x² + 144)
9/16 = x² / (x² + 144)
9/16 x² + 81 = x²
81 = 7/16 x²
x ≈ 13.6
select the intermolecular forces present in water. group of answer choices h-bonding ion-dipole london dispersion dipole-dipole
Answers
The intermolecular forces present in water include hydrogen bonding and dipole-dipole interactions.
Water is a polar molecule, meaning it has a positive and a negative end due to an uneven distribution of electron density. This polarity gives rise to intermolecular forces that hold water molecules together.
One of the intermolecular forces present in water is hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom, which is covalently bonded to an electronegative atom (in this case, oxygen), is attracted to another electronegative atom (such as oxygen or nitrogen) in a different molecule. In water, the oxygen atom of one water molecule forms a hydrogen bond with a hydrogen atom of a neighboring water molecule. Hydrogen bonding is a strong intermolecular force and contributes to many of the unique properties of water, such as its high boiling point and surface tension.
In addition to hydrogen bonding, water also exhibits dipole-dipole interactions. Dipole-dipole interactions occur between the positive end of one polar molecule and the negative end of another polar molecule. In water, the positive hydrogen end of one water molecule is attracted to the negative oxygen end of a neighboring water molecule. These dipole-dipole interactions are weaker than hydrogen bonds but still contribute to the overall intermolecular forces present in water.
Other intermolecular forces, such as ion-dipole interactions and London dispersion forces, are not as significant in water compared to hydrogen bonding and dipole-dipole interactions. Ion-dipole interactions occur between an ion and the charged end of a polar molecule, while London dispersion forces arise from temporary fluctuations in electron distribution. While these forces may exist in other substances, they play a relatively minor role in the intermolecular forces of water.
In conclusion, the intermolecular forces present in water are primarily hydrogen bonding and dipole-dipole interactions. These forces contribute to the unique properties and behavior of water as a liquid.
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3. London equation [4 points (hand-in)] To describe the magnetic induction in a superconductor, we postulate that the corresponding vector potential is proportional to the current density, Ã= -Hoμr X²₂3, where X is the so called London penetration depth; its meaning will become more clear upon solving this exercise. a) Consider the case of a time-independent electric field and magnetic induction and show that the vector potential defined above leads to the differential equation AB: = B. X² b) Consider a superconductor at r < d and vacuum at r > d. A uniform magnetic induction B Boe, exists outside the superconductor. Calculate magnetic induction B inside by solving the differential equation from part a) and imposing B(+d/2) = Bo as boundary conditions. c) Ohm's law states that (r, t) = E(r, t) for conductivity o. Show that it does not hold for a superconductor by proving that E vanishes for a stationary current (03(F) = 0). V x B-H Further reading: Kittel. Introduction to solid state physics. Chapter 10, Superconductivity. Hints: Use the Maxwell equations for linear media in the absence of free charges, V-B = 0, V. E = 0 JË - μομπεrhoες = Hour], VXĒ + = 0. Ət ƏB Ət b) You may use the Ansatz B(r) = B(x)ēz. c) You may use that any physical vector field a vanishes if both V. a = 0 and ▼ x a = 0 (Helmholtz decomposition).
Answers
The provided analysis is mostly correct, but there are a few errors in the calculations and explanations. The vector potential defined above leads to the differential equation B = -2HoμrX^2.
Let's go through the calculations and explanations again:
a) To show that the vector potential defined above leads to the differential equation, we start with the given vector potential A = -Hoμr X².
To find the magnetic induction B, we use the relation B = ∇ x A. Taking the curl of A, we have:
∇ x A = ∇ x (-Hoμr X²)
Using the identity for the curl of a vector in cylindrical coordinates (∇ x (Frφ) = (1/r)(∂Fz/∂r) - (∂F/∂z)), we can express the curl of A as:
∇ x A = (1/r)(∂(-Hoμr X²)/∂z) - (∂(-Hoμr X²)/∂r)
Evaluating the partial derivatives, we have:
∇ x A = -Hoμ(2rX^2/r) - 0
Simplifying, we get:
∇ x A = -2HoμrX^2
Comparing this result with B, we have:
B = -2HoμrX^2
b) Given a superconductor at r < d and vacuum at r > d, with a uniform magnetic induction B = Bo outside the superconductor. We want to calculate the magnetic induction B inside the superconductor by solving the differential equation from part a) and imposing the boundary condition B(+d/2) = Bo.
The differential equation we obtained in part a) is B = -2HoμrX^2. To solve this equation, we need to substitute X with X = r/d.
Substituting X = r/d, we have:
B = -2Hoμ(dX)^2
B = -2Hoμ(d^2)(X^2)
We can rewrite this equation as:
B = -2(Hoμd^2)X^2
Comparing this with the general form of the magnetic induction inside the superconductor, B(X) = Aexp(-X/λ) + Bexp(X/λ), we can identify A = 0 and B = -2(Hoμd^2).
Therefore, the magnetic induction inside the superconductor is given by:
B(X) = -2(Hoμd^2)exp(X/λ)
Using the boundary condition B(+d/2) = Bo, we substitute X = d/2:
Bo = -2(Hoμd^2)exp(d/2λ)
Solving for the constant λ, we have:
λ = -d/(2ln(Bo/(2Hoμd^2)))
Therefore, the magnetic induction B inside the superconductor can be expressed as:
B(X) = -2(Hoμd^2)exp(X/λ)
c) Ohm's law states that J = σE, where J is the current density, σ is the conductivity, and E is the electric field.
For a stationary current (J = 0), Ohm's law implies that E should also be zero. However, in a superconductor, the conductivity becomes infinite at T = 0 K. As a result, the electric field E vanishes for a stationary current, and Ohm's law does not hold in a superconductor.
Therefore, the statement that E vanishes for a stationary current in a superconductor (J × B = 0) is correct.
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Echoing effect produced by many reflections of sound.
a. True
b. False
Answers
This statement is true due to the echoing effect that is caused by numerous sound reflections.
What is the greatest way to define sound?The mechanically maximum flux that is transferred by transverse sound pressure in a transparent medium (like air) that is the direct source of hearing is the feeling experienced by the perception of hearing.
A power, is sound?Sound power (J/s or W in SI units) is the rate of energy, or sound energy per unit of time, that is emitted by the a source. Acoustic audio power is transmitted as sound travels across a medium. The sound intensity is a vector quantity that has direction thru a surface and is defined as the sound transmitting power through a surface (W/m2).
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a piano tuner is tuning a piano when he discovers that the G above middle C is vibrating with a higher frequency than his G tuning fork, which vibrates at 392.0 Hz. He plays the piano key and tuning fork at the same time and hears a beat frequency of 2.0 Hz.
a. What is the frequency of the G on Ms. Carlton's piano?
b. If it had been a lower frequency, creating a beat frequency of 4.0 Hz, what would it have been?
Answers
Answer:
Tuning a piano is the process of adjusting the tension of its strings, thereby altering their pitch, or frequency of vibration, by slightly turning the tuning pins to which they're attached, so that each string sounds pleasingly in harmony with every other string.
Hopefully u will satisfy with my answer of ur question..!!Have a nice day ahead dear..!!In a loudspeaker, an electromagnetic coil rapidly drives a paper cone back and forth, sending out sound waves.Part AIf the cone of a loudspeaker moves sinusoidally at 1.6 kHz with an amplitude of 2.5 μm, what is the cone's maximum speed?Part BWhat is the cone's maximum acceleration?
Answers
Part A
The sound generated moves back and forth in simple harmonic motion. The formula for calculating maximum speed, vmax is expressed as
vmax = wA
where
w is the angular velocity
A is the amplitude
Recall,
w = 2 x pi x frequency
Thus,
vmax = 2 x pi x frequency x amplitude
From the information given,
frequency = 1.6KHz
We would convert from KHz to Hz
Recall,
1 KHz = 1 x 10^3 Hz
1.6 KHz = 1.6 x 10^3 Hz
amplitude = 2.5 μm
we would convert μm to m
Recall,
1 μm = 1 x 10^-6 m
2.5 μm = 2.5 x 10^-6 m
pi = 3.14
By substituting these values into the formula, we have
vmax = 2 x 3.14 x 1.6 x 10^3 x 2.5 x 10^-6
vmax = 0.025 m/s
Part B
The formula for calculating maximum acceleration, Amax is
Amax = w^2A
where
a = amplitude
Amax = (2 x pi x frequency)^2A
Amax = (2 x 3.14 x 1.6 x 10^3)^2 x 2.5 x 10^-6
Amax = 252.4 m/s^2
PLS ANSWERR THIS QUESTION FOR ME !!
Answers
Explanation:
20 joule is your answer
Answer:
here
mass m =100kg
distance d=50m
acceleration due to gravity a =10m/s²
work =force×displacement
= ma/d=100×10/50=20joule
Calculating the Magnitude of the Resultant Vector
R
13 m
5m
What is the magnitude of the resultant vector? Round
your answer to the nearest tenth.
m
Answers
The magnitude of the resultant vector is 13.9m.
The size of the resulting vector can be determined using the Pythagorean theorem. As you can see from these two examples, the result of adding three or more rectangular vectors is easy to determine using the Pythagorean theorem. The vectors should be added in a different order. Equation 2 Subtracts the vectors in opposite directions from each other to get the resulting vector.
Where vector B is in the opposite direction to vector A and R is the resulting vector. The resulting vector is defined as a single vector that produces the same effect as many vectors produced together. The size of a vector is the length of the vector. The absolute value of vector a is represented by |a|. For more information on vector sizes, see Vectors overview. The formulas for the sizes of 2D and 3D vectors in terms of coordinates are derived on this page.
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suppose and 46 mm, then what is the value of ? express your answer in milli-coulombs per square meter (10-3 c/m2) to one place after the decimal. don't forget the minus sign if the answer is negative.
Answers
The electric field strength is 0.046 C/m2, or 0.046 x 10-3 C/m2, or 0.046 mC/m2, at a distance of 46 mm (to one place after the decimal).
Calculate the electric field strength (E) at a distance of 46 mm using the formula
E=V/d, where V is the voltage and d is the distance.
E = V/d = (46 mm)/(1000 mm)
E = 0.046 V/m
Convert this electric field strength to milli-coulombs per square meter (10-3 c/m2) using the formula E=q/A, where q is the charge and A is the area.
We can assume that the area is 1 m2, and q is the electric field strength (0.046 V/m) multiplied by one coulomb, which is 1 C.
Therefore, q = (0.046 V/m) x (1C) = 0.046 C.
Calculate the electric field strength using the formula E = q/A.
E = q/A = (0.046 C)/(1 m2) = 0.046 C/m2
Convert the electric field strength to milli-coulombs per square meter (10-3 c/m2).
The electric field strength at a distance of 46 mm is 0.046 C/m2, which is equivalent to 0.046 x 10-3 C/m2, or 0.046 mC/m2 (to one place after the decimal).
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Explain What the core muscles do and why it's important to have a strong set of core muscles.
Answers
Answer: Core muscles protect the spine and keeps it stabilized. Also they can help control movements such as walking and standing. The core helps transfer energy and help us move in different directions. It's important to have a strong set of core muscles.
Explanation:
Answer:
The core muscles stabilize and protect the spine. They help control all movements and make it possible for us humans to walk and stand up right. The core helps us transfer energy, shift our body weight and reach/move in different directions. It is important to have a strong set of core muscles because it makes everyday activities easier.
Explanation:
PLEASE HELP!! Use the information below to solve this problem: A note has a wavelength of 0.65551 m. If the speed of sound is 343.00 m/s, what pitch is this note?
speed of sound in air: 343 m/s
A. 440.00 Hz
B. 493.88 Hz
C. 523.25 Hz
D. 587.33 Hz
E. 659.26 Hz
F. 698.46 Hz
G. 783.99 Hz
Answers
Answer:
C
Explanation:
Given that a note has a wavelength of 0.65551 m. If the speed of sound is 343.00 m/s, the pitch of the note is the same as the frequency.
Sound Velocity = product of frequency and wavelength.
Substitute wave speed and wavelength into the formula
343 = f × 0.65551
Make f the subject of formula
F = 343 / 0.65551
F = 523.58 Henz
Therefore, the pitch of the note is 523.52 Hz approximately
The correct answer is option C
An ant crawled from a hole to the food. For the first 6
minutes, it travelled at an average speed of 15 m/min. For
the next 9 minutes, it travelled at an average speed of 10
m/min. What was the average speed of the whole journey?
m/min
Answers
Answer:12
Explanation:Average speed=Total Distance divided by Total Time.
ElectAltEngOnl.19-20.SEC - Theodore Neitzel
1 of 3
Dada:
+
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D. The strength of an electric field.
Use the following scenario to answer question 2.
Some students took a study break and played Guitar Hero on their PlayStation. They used a TV
requiring 1.75 amps and a PlayStation requiring 0.75 amps. Assume electricity costs $0.15 per
kWh and they used 120V outlets.
2. What is the resistance of the TV?
A. 68.6 amps
B. 210 amps
C. 68.6 ohms
D. 210 ohms
Answers
Answer:
Option C is correct.
The resistance of the TV = 68.6 ohms.
Explanation:
According to Ohm's law, the voltage across a device is equal to the product of the current through the device and the resistance across the device.
Since electrical appliances are setup in parallel connection, the voltage across the TV and the PlayStation is the same and is 120 V.
V = IR (From Ohm's law)
V = voltage across the TV = 120 V
I = current flowing through the TV = 1.75 A
R = Resistance of the TV = ?
120 = 1.75 × R
R = (120/1.75) = 68.57 ohms = 68.6 ohms.
Hope this Helps!!!
how does Newton's third law of motion give a property of process
Answers
Answer:
Newton's third law explains the generation of thrust by a rocket engine. In a rocket engine, hot exhaust gas is produced through the combustion of a fuel with an oxidizer. The hot exhaust gas flows through the rocket nozzle and is accelerated to the rear of the rocket. In re-action, a thrusting force is produced on the engine mount.
Explanation:
pa brainliest po :D
A cube measures 3cm on each side has a mass of 25 grams. what it its density and relative density.
Answers
Answer:
Density= 2.78 g/cm³
Relative density=2.8
Explanation:
To calculate the density of the cube we have to use the formula ρ=mass/volume
ρ stands for density.
So now we don't have the volume of the cube and to find the volume of the cube we have to use the formula a³
3³= 9 cm³
Now plug in the values. ρ= 25 g/9 cm³
ρ= 2.78 g/cm³
To find the relative density, we have to use the formula ρsample/ρH20
The sample means the density of the substance earlier. We do not know the density of water but it is constant at 997 kg/m³.
Now we have to make the units same so you change the unit of the density of cube to kg/m³
So, 25/1000= 0.025 kg
9/100×100×100 (because cm³ which means that there should be 3 meters to change the unit and to conver cm to meter we need to divide by 100 so 9cm/100, 9cm²/100×100, 9cm³/100×100×100)
=0.000009 m³
The new density= 0.025 kg/ 0.000009 m³
= 2777.78 kg/m³
Now plug the values into the formula:
relative density= 2.777.78 kg/m³ / 997 kg/m³
=2.8
There is no unit since kg/m³ and kg/m³ cancels
Consider the three parts of the circuit: the top branch with two bulbs; the middle branch with one bulb; the battery.
A. Rank the current through each, from greatest to least.
B. Rank the voltage across each from greatest to least.
Answers
A) The current through the branches can be ranked as follows; 1. The middle branch 2. The top branch 3. The battery.Explanation: Current is measured in amperes, and it is the flow of electrical charge in the circuit. When we turn on an appliance, a current flows through the circuit, powering the device. It's crucial to note that current is the same at all points in a series circuit.
The formula for current is I = V/R, where V is the voltage and R is the resistance. The circuit's middle branch has only one bulb, so its resistance is lower than the resistance of the top branch. As a result, the current in the middle branch is greater than the current in the top branch. The battery has the greatest current because it is the source of the current that flows through the circuit.
As a result, the current can be ranked as follows: middle branch > top branch > battery. B) The voltage across the branches can be ranked as follows; 1. The battery 2. The top branch 3. The middle branch.Explanation: Voltage is measured in volts and is the electrical potential difference between two points in a circuit. Voltage is the same across all branches in a parallel circuit. It's crucial to note that the sum of voltages in a parallel circuit is the same as the voltage of the battery.
The voltage across the battery is the same as the voltage across the top branch since the battery is in parallel with the top branch. The voltage across the middle branch, on the other hand, is the lowest because it has just one bulb and has a lower voltage drop than the top branch. As a result, the voltage can be ranked as follows: battery > top branch > middle branch.
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Give reason for the following:
a) An inflated balloon was pressed against a wall after it has been rubbed with a
piece of synthetic cloth. It was found that the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground.
c) Mountaineers suffer nose bleeding at higher altitudes.
d) Foundations of high rise buildings are kept wide.
e) Deep sea divers or high altitude fliers wear special suits.
f) Walls of a dam are thickened near the base.
Answers
a) An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. This is because a positive and negative electric charge is produced, therefore the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground because of gravitational attraction force of earth.
c) Mountaineers suffer nose bleeding at higher altitudes because the oxygen level decreases with increase in altitude, which the body cannot adjust.
d) Foundations of high rise buildings are kept wide because more is the area of contact, less is the pressure efforts. So, foundations are wide so as to decrease the possibility of the building from falling down.
e) Deep sea divers or high altitude fliers wear special suits so as prevent their body from being crushed by the water pressure. Since water pressure is maximum at deep seas and oceans, therefore, more is the risk of being injured.
f) Walls of a dam are thickened near the base so that the dam can handle the kinetic energy pressure and prevent itself from breaking down, which if not, can lead to flooding.
HOPE IT HELPS...
A ball initially rolling at 10 m/s comes to a stop in 25 seconds. Assuming the ball has uniform acceleration, how far does it travel during this time interval?.
Answers
In that amount of time, the ball will travel 250 meters.
Uniform acceleration: What does it mean?We refer to uniform acceleration as the process through which an object's speed (velocity) increases at a constant pace. The acceleration rate is constant. A car's acceleration is not consistent if it accelerates quickly before slowing down.
What are the three categories of acceleration?The three main categories of accelerated motions are uniform, non-uniform, and average acceleration. When an item moves in a straight path with an increase in speed occurring at regular intervals of time, this motion is referred to as having uniform acceleration.
According to the question -
u = 10 m/s
t = 25 s
Therefore -
Distance = u x t = 10 x 25 = 250 meters.
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the event that settled the shapley-curtis debate about the nature of spiral nebulae was the discovery of
Answers
The event that settled the Shapley-Curtis debate about the nature of spiral nebulae was the discovery of is cepheid variable stars in the Andromeda nebula.
History of Shapley-Curtis debate
In 1920, the so-called "Great Debate" took place between Harlow Shapley and Heber Curtis about the nature of the Milky Way, spiral nebulae and the dimensions of the universe. To support his claim that the Great Andromeda Nebula is an external galaxy, Curtis pointed out evidence of dark bands resembling the dust clouds present in the Milky Way as well as a significant Doppler shift.
The problem was definitively resolved in 1922 when the Estonian astronomer Ernst Öpik provided distance determinations that supported the theory that the Andromeda Nebula was legitimately a distant extragalactic object.
Using the Mount Wilson Observatory's new 100-inch telescope, Edwin Hubble was able to determine that the outer fields of some spiral nebulae were clusters of single stars and identified several Chepeid variable stars, which allowed him to estimate the distances of the nebulae: they were too far away to be able to form part of the Milky Way. In 1936 Hubble created a classification system for galaxies that is still used today, the Hubble sequence.
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Below you will find three descriptions of scientists engaging in activities that are part of the scientific method. What are the missing worde missing word?
Description
Christina decides to test the idea of her friend Anders that different metals make characteristic colors in flame. She mixes up a variety of metal solutions, then dips steel wires into each and puts each wire into a flame nating the color of the flame in her record of this __________.
Anders dips a steel wire into a solution of copper sulfate and then puts it into a flame, recording the _________that the fame turns green.
Wolfgang has worked out a_____________ that explains the wavelengths of light absorbed or emitted by any kind of atom, based around the idea that the motion of tiny confined particles (like electrons in atoms) are restricted like the vibration of guitar strings, to certain frequencies. Using equations that express his ideas, Wolfgang is able to successfully calculate the wavelengths of light absorbed or emitted by many atoms.
Answers
Below you will find three descriptions of scientists engaging in activities that are part of the scientific method. The missing word are as follows: Christina decides to test the idea of her friend Anders that different metals make characteristic colors in flame.
She mixes up a variety of metal solutions, then dips steel wires into each and puts each wire into a flame, noting the color of the flame in her record of this observation. Anders dips a steel wire into a solution of copper sulfate and then puts it into a flame, recording the color that the fame turns green. Wolfgang has worked out a theory that explains the wavelengths of light absorbed or emitted by any kind of atom, based around the idea that the motion of tiny confined particles (like electrons in atoms) are restricted like the vibration of guitar strings, to certain frequencies.
Using equations that express his ideas, Wolfgang is able to successfully calculate the wavelengths of light absorbed or emitted by many atoms.
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James went to the doctor for a check-up and found his weight to be 1,000 N. How much mass does James have?
Answers
Answer:
102.04kg
Explanation:
(1000kg*m/s^2)/(9.8 m/s^2)
Plz someone help me Asap
Answers
Answer:
all I know is C
are there more questions? anyone?
-KARL IS STOOPID
Explanation:
Considering the conservation of mechanical energy when designing a roller coaster,
which statement below is true?
(A) No other hill on the roller coaster track can be higher than the first hill and
the hills following the first hill must randomly vary in height-short, tall, tall,
short, etc.-in order to conserve the mechanical energy of the system.
(B) Only one other hill can be higher than the first hill and there must be a hill
placed on the track between the first hill and this higher hill such that its slope
is twice as steep as the slope of the higher hill.
(C) No other hill on the roller coaster track can be higher than the first hill
because the energy required to climb such a hill would be greater than the
total mechanical energy of the system.
(D) The only way to conserve the total mechanical energy of the system is to
conserve the roller coaster's gravitational potential energy by making sure that
the last vertical drop is the same as the first.
Answers
Answer:
Option C is true: No other hill on the roller coaster track can be higher than the first hill because the energy required to climb such a hill would be greater than the total mechanical energy of the system. This is because roller coasters rely on their initial potential energy (at the top of the first hill) to provide the energy needed to make it through the rest of the track. If subsequent hills are higher than the first hill, the roller coaster would not have enough potential energy to make it up the hill and would slow down or stop. Therefore, roller coasters are designed with successive hills that gradually decrease in height, allowing the roller coaster to conserve its mechanical energy and maintain its speed throughout the ride.
what is the temperature of the ocean in kelvins if it is 76°F ?
Answers
The temperature of the ocean in kelvins is 297.59 K. To convert a temperature from Fahrenheit (°F) to Kelvin (K), you can use the formula T(K) = (T(°F) + 459.67) × 5/9.
For the given temperature of 76°F, we apply this formula: T(K) = (76 + 459.67) × 5/9 = 535.67 × 5/9 = 297.59 K.
Therefore, if the ocean temperature is 76°F, it corresponds to approximately 297.59 K in Kelvin.
Kelvin is an absolute temperature scale where 0 K represents absolute zero, the lowest possible temperature. It is widely used in scientific and thermodynamic calculations.
Converting temperatures between Fahrenheit and Kelvin allows for consistency and compatibility with scientific measurements and analyses.
Know more about thermodynamic here
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Put the waves in order from shortest to longest wavelength
Answers
Answer:
b, a, c
Explanation:
The middle one has the shortest wavelength, then it's the top one and the last one has the longest wavelength.
why are annowwhisker used to repel stains on fabrics
Answers
Answer:Because it makes the stains like go away which makes the fabrics get not stained so yeah