Author Question: The weight of spaceman Speff at the surface of planet X, solely due to its gravitational pull, is ... (Read 61 times)

future617RT · **on:** Jul 29, 2018

The weight of spaceman Speff at the surface of planet X, solely due to its gravitational pull, is 389 N. If he moves to a distance of 1.86 104 km above the planet's surface, his weight changes to 24.31 N.

What is the mass of planet X, if Speff's mass is 75.0 kg? (G = 6.67 10-11 N m2/kg2) A) 2.99 1024 kg
B) 2.99 1018 kg
C) 2.99 1017 kg
D) 1.59 1018 kg

Question 2

When a fixed amount of ideal gas goes through an isothermal expansion

A) its internal (thermal) energy does not change.
B) the gas does no work.
C) no heat enters or leaves the gas.
D) its temperature must decrease.
E) its pressure must increase.