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sasho [114]
3 years ago
10

A woman stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.79

of her regular weight.
(a) Calculate the magnitude of the acceleration of the elevator.
(b) Find the direction of the acceleration.
Physics
1 answer:
Nataly [62]3 years ago
8 0

Answer:

Part a)

a = 2.06 m/s^2

Part b)

Lift is moving downwards as it is coming with negative sign

Explanation:

As we know that the reading of the scale is equal to the normal force on the woman

So we will have

F_n - mg = ma

here we know that

F_n = 0.79 mg

so we will have

0.79 mg - mg = ma

a = -2.06 m/s^2

Part a)

magnitude of the acceleration of the lift is given as

a = 2.06 m/s^2

Part b)

Lift is moving downwards as it is coming with negative sign

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Answer:

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Explanation:

a) Force needed to lift the 25 kg object is the same as the weight of the object:

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b) Work is the force exerted times the distance moved:

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c) The power exerted is the quotient of the work done over the amount of time it took to move the object:

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