An object has a weight of 21,532 n on earth. what is the mass of the object?

question 7 options:

2,200 g

2,197 kg

215,000 kg

none of the above

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question 8 (10 points) question 8 unsaved
what is the mass of the object from the previous question if we put it on the moon? the force of gravity on the moon is 1.62 m/s2

question 8 options:

21,532 kg

2,197 n

3,515 n

2,197 kg

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question 9 (10 points) question 9 unsaved
how much force is exerted if a 250 kg object has an acceleration of 750 m/s2 ?

question 9 options:

0.33 n

187,500 n

3 n

none of the above

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question 10 (10 points) question 10 unsaved
a resting soccer ball moving after it is kicked is an example of which of newton's laws?

question 10 options:

1st law

2nd law

3rd law

7) 2,197 kg

The weight of an object on Earth is given by:

where m is the mass of the object and is the acceleration due to gravity. Since we know the weight of the object, W=21,532 N, we can re-arrange the equation to calculate the object's mass:

8) 2,197 kg

Mass is an intrinsec property of an object: it says "how much matter" is contained within an object. Therefore, the mass of an object does not depend on its location: so, the object has the same mass on Earth and on the moon, and so its mass is still the same as the previous exercise, 2,197 kg.

9) 187,500 N

The force exerted on an object is given by Newton's second law:

where m is the mass of the object and a its acceleration. In this problem, and , so the force exerted on the object is

10) 2nd Law

Newton's second law states that an object which is acted upon a force experiences an acceleration given by:

where F is the force and m the mass of the object. As a result, the object accelerates, so if it was at rest, it starts moving.

This is exactly what happens in this example: the ball is initially at rest, but then a force is applied on it (by the kick), so the ball is accelerated and it starts moving.