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astra-53 [7]
3 years ago
15

Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, t

he first having a mass of 150,000 kg and a velocity of 0.300 m/s, and the second having a mass of 95,000 kg and a velocity of -0.120 m/s. (The minus indicates direction of motion.) What is their final velocity?
Physics
1 answer:
Natasha_Volkova [10]3 years ago
6 0

Answer:   0.137 m/s

Explanation:

from the question we are given the following

mass of train A (Ma) = 150,000 kg

velocity of train A (Va) = 0.3 m/s

mass of train B (Mb) = 95,000 kg

velocity of train B (Vb) = -0.12 m/s

final velocity (V) = ?

mass of both trains = 245,000 kg

  • to solve this question we apply the conservation of momentum

MaVa + MbVb = (Ma + Mb) x V

V = (MaVa + MbVb) /  (Ma + Mb)

V =  ((150,000 x 0.3) + (95,000 x (-0.12))) /  (245,000)

V = -33600 / 245,000

V = 0.137 m/s

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Answer:there won't be enough atoms that are excited around to undergo stimulated emmision

Explanation:

Stimulated Emission is the process used in laser operations to produce photons.

In stimulated emission a passer-by photon stimulates the atom to emit a photon, identical to the passer-by photon, immediately. The con to this is that the same passer-by photon could instead get absorbed by a de-excited atom.  Therefore, aside of atom excitation we need to use witty ways to insure that there are more excited atoms that could use the passer-by photon for stimulated emission than there are de-excited atoms.

Photons produced by this stimulation have the same wavelength which enables efficiency as all photons are emitted into the same node.

4 0
4 years ago
What is the frequency of the fundamental mode of vibration of a steel piano wire stretched to a tension of 440 N? The wire is 0.
algol [13]

Answer:

<h2><em>220.698Hz</em></h2>

Explanation:

The fundamental frequency f₀ is expressed as f₀ =V/2L where;

V is the speed of the string = \sqrt{\frac{T}{M} }

m is the mass of the string

L is the length of the string

T is the tension in the string

f₀ = \frac{1}{2L} \sqrt{\frac{T}{m} }

Given datas

m = 5.69g = 0.00569 kg

T = 440N

L = 0.630 m

Required

Fundamental frequency of the steel piano wire f₀

f_0 = \frac{1}{2(0.630)}\sqrt{\frac{440}{0.00569} } \\ \\f_0 =  \frac{1}{1.26}\sqrt{77,328.65 } \\\\f_0 = \frac{1}{1.26} * 278.08\\\\f_0 = 220.698Hz

<em>Hence the frequency of the fundamental mode of vibration of the steel piano wire stretched to a tension of 440N is 220.698Hz</em>

3 0
3 years ago
Which property describes the temperature at which a liquid changes to a gas?
Rufina [12.5K]

Answer:

Boiling Point

Explanation:

When a liquid changes to a gas is called the boiling point.

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What are the units of atmospheric pressure?
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a unit of pressure defined as 101325 Pa

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