What is the weight of a 74 kg astronaut: A person stands on the ground and recor

Question

What is the weight of a 74 kg astronaut: A person stands on the ground and records their mass with a bathroom scale. La ter, the person is in an elevator and records a mass of 0.75 times what they found on solid ground. What direction is the elevator going? What is the magnitude of the acceleration? A 2.3 kg stone is dropped from the top of a building, then falls 50m to the ground, before reaching a final velocity of 30 m/s. If the only two forces acting on the object are gravity and air resistance What is the acceleration of the stone? It will not be 9.81 m/a^2. What is the net force on the stone? What is the average force of air resistance on the stone?

Explanation / Answer

4.

a). Weight on earth = mg = 74 x 9.81 N

= 725.94 N

b). Weight on moon = m g(moon) = 74 x 1.7

= 125.8 N

5.

a). As the apparent weight recorded is less than the actual weight, elevator is accelerating downwards.

b). Let the magnitude of acceleration be a

Apparent weight = mg - ma

0.75 x mg = mg - ma

a = 0.25 x g = 0.25 x 9.81 = 2.45 m / s2

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