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2 years ago

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During the filming of a movie, a car sits atop a cliff edge. To be able to get the car to move from the cliff, the workers had t

o pry the car with a long bar set upon a fulcrum, in other words, they used a(n) _____.

1 answer:

stellarik [79]2 years ago

3 0

Answer: Lever

Explanation: Levers are simple machines used to raise heavy loads over a short distance. It involves a beam which could be a plank, rood or metal material placed on a rigid support or pivot called the fulcrum, A Lever increases the the input force or effort applied to produce a greater output force required to move a heavy load. Levers are classed as first, second and third class Levers depending on the arrangement of the load, effort and fulcrum.

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Answer:

Explanation:

Given

Original Frequency $f=723\ Hz$

apparent Frequency $f'=697\ Hz$

There is change in frequency whenever source move relative to the observer.

From Doppler effect we can write as

$f'=f\cdot \frac{v-v_o}{v+v_s}$

where

$f'=$ apparent frequency

v=velocity of sound in the given media

$v_s=$ velocity of source

$v_0=$ velocity of observer

here $v_0=0$

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$v_s=(\frac{f}{f'}-1)v$

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distance traveled by fork is given by

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u=initial velocity

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Answer:

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Explanation:

Given:

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time taken to respond to the situation, $t$

acceleration of the car after braking, $a$

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where:

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