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marshall27 [118]
2 years ago
5

A crate slides off the back of a flatbed truck that accelerated forward from rest. If the bed of the truck is frictionless, the

crate falls off the back of the truck because
A. air friction pushes it backwards.
B. it moves forward with the truck but the truck goes too fast.
C. it is at rest and it tends to stay at rest.
D. it accelerates in the opposite direction of the truck.
Physics
1 answer:
jolli1 [7]2 years ago
5 0
The right answer should be B
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A train at rest emits a sound at a frequency of 1057 Hz. An observer in a car travels away from the sound source at a speed of 2
il63 [147K]

Answer:

993.52 Hz

Explanation:

The frequency of sound emitted by the stationery train is 1057 Hz.

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The frequency the observer hears is given by the formula:

f_o = \frac{v - v_o}{v}f

where v = velocity of sound = 343 m/s

vo = velocity of observer

f = frequency from source

This phenomenon is known as Doppler's effect.

Therefore:

f_o = \frac{343 - 20.6}{343} * 1057\\ \\f_o = 322.4 / 343 * 1057\\\\f_o = 993.52 Hz

The frequency heard by the observer is 993.52 Hz.

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