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allochka39001 [22]

2 years ago

11

Sunlight passes through the windows of a car and causes the car seats to get hot. Which type of energy flow is involved in heati

ng the seats?.

1 answer:

Snowcat [4.5K]2 years ago

3 0

Answer: radiation

Explanation:

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A 24000- railroad freight car collides with a stationary caboose car. They couple together, and 22 percent of the initial kineti

Klio2033 [76]

Answer:

$m_{c} = 6768\,kg$

Explanation:

According to the Principle of Energy Conservation and the Work-Energy Theorem, the system is modelled as follows:

$K_{o} = K_{f} + W_{loss}$ , where $\frac{K_{f}}{K_{o}} = 0.78$ .

Then,

$K_{f} = 0.78\cdot K_{o}$

$0.5\cdot (m_{f}+m_{c})\cdot v_{f}^{2} = 0.39\cdot m_{f}\cdot v_{o}^{2}$

Besides, the Principle of Momentum Conservation describes the following model:

$m_{f}\cdot v_{o} = (m_{f}+m_{c})\cdot v_{f}$

The final velocity of the system is:

$v_{f} = \frac{m_{f}}{m_{f}+m_{c}}\cdot v_{o}$

After substituting in the energy expression:

$0.5\cdot \frac{m_{f}^{2}}{m_{f}+m_{c}}\cdot v_{o}^{2} = 0.39\cdot m_{f}\cdot v_{o}^{2}$

$0.5\cdot m_{f} = 0.39\cdot (m_{f}+m_{c})$

The mass of the caboose is:

$0.39\cdot m_{c} = 0.11\cdot m_{f}$

$m_{c} = 0.282\cdot m_{f}$

$m_{c} = 0.282\cdot (24000\,kg)$

$m_{c} = 6768\,kg$

8 0

4 years ago

. A radio station transmitting at a frequency of 200KH, emits waves of wavelength 1.5 km.the velocity of the radio waves is

Karolina [17]

Answer:

Explanation: as,

v=f∧

v=200×10³×1.5×10³

v=2.7×10^7ms⁻¹

4 0

3 years ago

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Scrat [10]

when observer and source moves relative to each other then the frequency received by the observer is different from the real frequency

This apparent change in frequency due to relative motion is known as Doppler's effect.

Here we know that

$f_{app} = f_o\frac{v\pm v_o}{v \pm v_s}$

here we know that

$f_o$ = real frequency

v = speed of sound

$v_o$ = speed of observer

$v_s$ = speed of source

so this is known as Doppler's Effect

6 0

4 years ago

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A car is traveling along a straight road at a velocity of +30.0 m/s when its engine cuts out. For the next 1.79 seconds, the car

Tanzania [10]

Answer:

first value+2nd +3rd

Explanation:

thug life and there

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Marina86 [1]

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3 years ago