What is is the weight of 70 kg body on the surface of a planet whose mass is 1/ 7th that of earth and radiusis half of earth?
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Secondary School Physics 5 points
What is the weight of a 70 kg body on the surface of the planet whose mass is 1/7th of that Earth and the radius is half of the earth
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b394184
b394184 Virtuoso
We know g = G M /r^2
M= mass of planet, r is radius
on Earth it's about 10
on new planet g = 1/7 times ( due to mass is less) and 4 times (due to radius, remember square)
so basically 4/7 times g of Earth
g = 4/7 g
Weight = mg (m = mass of object, g is gravitational acceleration of that particular planet)
Weight on new planet = 70 * 4/7 g
=40 g
about 400 N (if taking g=10)
= 392 N (if taking g=9.8)
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