Question

A) What is the weight of a 69 kg astronaut on Earth?

B) What is the weight of a 69 kg astronaut on the Moon? (g = 1.7 m/s2).

C) What is the weight of a 69 kg astronaut on Mars? (g = 3.7 m/s2).

D) What is the weight of a 69 kg astronaut in outer space traveling with constant velocity?

Answer 1

We know that the weigh of the mass m is W = mg

wher g is acceleration due to gravity

here mass of astronaut is m = 69 kg

A) m = 69 kg , W = m*g = 69*9.8 N = 676.20 N

B) on moon with g = 1.7 m/s2

W2 = 69*1.7 N = 117.3 N

C) the weight of a 69 kg astronaut on Mars with g = 3.7 m/s2

W3 = m*g = 69*3.7 N = 255.3 N

D) the weight of a 69 kg astronaut in outer space traveling with constant velocity is  

W4 = m*g = 69 *0 = 0 N

in space the acceleration due to gravity is zero