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2a 6 pts) Use Newtons Universal Law of Gravitation to calculate the gravitational potential energy of an 80 kg astronaut sta
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Answer #1

2a) Potential energy of an object at a distance r from the surface of mars is

U=-G R + T

R=radius of mars

m=mass of the object

M=mass of mars

Given

R=3400 km=3400X10^3 m

M=6.4X10^23 kg

m=80 kg

Hence, potential energy of the astronaut at the top of a 5m ladder is

80 × 6.4 × 1023 3400 × 1045 J ~-109 J Uー-6.67 × 10-11 ×

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