# physics question

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Thread starter 4 weeks ago
#1
I'm not quite sure how i would work out this question as it asks me for the mass of the object on the planet however, in the answer it uses the weight of the object on earth and not on the planet and when asking for the KE of the object falling on the planet it uses the mass of the object on earth? Any help would be appreciated.

n object that has a weight of 15N on Earth is taken to a planet where it has a weight of 3.0 N.
The planet has no atmosphere.
Which line in the table correctly shows the mass of the object on the planet, and the kinetic
energy it gains after falling from rest near the surface of the planet through a vertical distance
of 10 m?
(Take the gravitational field strength g on Earth to be 10N/ kg.)
The answer is 1.5Kg and 30J
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4 weeks ago
#2
(Original post by Dhhdndjdjjdjd)
I'm not quite sure how i would work out this question as it asks me for the mass of the object on the planet however, in the answer it uses the weight of the object on earth and not on the planet and when asking for the KE of the object falling on the planet it uses the mass of the object on earth? Any help would be appreciated.

n object that has a weight of 15N on Earth is taken to a planet where it has a weight of 3.0 N.
The planet has no atmosphere.
Which line in the table correctly shows the mass of the object on the planet, and the kinetic
energy it gains after falling from rest near the surface of the planet through a vertical distance
of 10 m?
(Take the gravitational field strength g on Earth to be 10N/ kg.)
The answer is 1.5Kg and 30J
The mass of the object doesn't change and is the same anywhere.
On earth it can be calculated from W=mg and gives
15 = m x 10 (assuming g=10m/s2)
It is the same on the planet.

If its weight is 3N on the planet and it falls 10m, the work done by gravity is force x distance = 3 x 10 joule
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