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ELEN [110]
3 years ago
8

What is the force on a 250 kg elevator that is falling freely at 9.8 m/sec2?​

Physics
2 answers:
Anettt [7]3 years ago
7 0

Answer:

\boxed {\boxed {\sf 2450 \ Newtons }}

Explanation:

The elevator is falling freely and the only force acting on it is weight. So,  calculate the weight.

We can do this by multiplying the mass by the acceleration of gravity.

W=m*g

The mass of the elevator is 250 kilograms and the acceleration of gravity is 9.8 meters per second squared.

m= 250 \ kg \\g= 9.8 \ m/s^2

Substitute the values into the formula.

W= 250 \ kg * 9.8 \ m/s^2

Multiply.

W=2450 \ kg*m/s^2

  • 1 kilogram meter per second squared is equal to 1 Newton
  • So, our answer of 2450 kg*m/s² is equal to 2450 N

W= 2450 \ N

The force of weight on the elevator is <u>2450 Newtons</u>

Viefleur [7K]3 years ago
6 0

Answer:

Since it is falling freely, the only force on it is its weight, w.

w = m × g = 250 kg × 9.8 m/s^2 = 2450 Newton/N

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Explanation:

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<em />

In the case of the Earth, in which the gravitational field is considered constant, the value of the gravitational potential energy U_{p} will be:  

U_{p}=mgh  

Where m is the mass of the object, g=9.8m/s^{2} the acceleration due gravity and h=500m the height of the object.  

Knowing this, let's begin with the calculaations:

For m=3kg

U_{p}=(3kg)(9.8m/s^{2})(500m)  

U_{p}=14700J=14.7kJ  

For m=6kg

U_{p}=(6kg)(9.8m/s^{2})(500m)  

U_{p}=29400J=29.4kJ  

For m=9kg

U_{p}=(9kg)(9.8m/s^{2})(500m)  

U_{p}=44100J=44.1kJ  

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3 years ago
A 2.35-kg rock is released from rest at a height of 21.4 m. Ignore air resistance and determine (a) the kinetic energy at 21.4 m
kvasek [131]

Explanation:

Given that,

The mass of rock, m = 2.35-kg

It was released from rest at a height of 21.4 m.

(a) The kinetic energy is given by : E_k=\dfrac{1}{2}mv^2

As the rock was at rest initially, it means, its kinetic energy is equal to 0.

(b) The gravitational potential energy is given by : E_p=mgh

It can be calculated as :

E_p=2.35\times 9.8\times 21.4\\\\E_p=492.84\ J

(c) The mechanical energy is equal to the sum of kinetic and potential energy such that,

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A(n) 0.5 kg soccer ball approaches a player horizontally with a speed of 10.6 m/s. The player illegally strikes the ball with he
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Answer: - 25.2 kgm/s

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3 years ago
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