Question

On the exoplanet Trappist-1d, g = 6.74 m/s² and on Mars g = 3.73 m/s². A fully suited-up astronaut has a mass of 125. kg.

1) When she is on a ladder 1.50 m above the surface of Mars she has more potential energy, PE, than when 1.50 m above Trappist-1d's surface. True or False

2) At 1.50 m above the Mars surface, her PE in units of J is: A) 125, B) 188, C) 699, or D) 1.84 x 10³

3) If she falls off the ladder on Mars, her final speed just before landing depends on her mass. True or False

4) What is her speed just before landing on the surface of Mars? (in m/s)

5) Your above answer for the speed assumed that there was no net non-conservative work. That is, W_nc = 0. True or False

6) If net non-conservative work is done on an object, its total mechanical energy (KE + PE) changes with time and W_nc = ΔKE + ΔPE = E^tot(final) - E^tot(initial)

7) A high-tech boat (m_b = 900. kg) with a criminal villain (m_c = 100. kg) onboard is drifting with a speed of 1.30 m/s under a bridge when a 300. kg super-hero jumps straight down from the bridge. After the hero lands on the boat, what is the speed in m/s of the boat? (Assume that the system of boat, villain and super hero is isolated.)

A) -0.500, B) - 0.300, C) 0, D) + 0.300, E) +1.00, or F) +1.30

9) You are in a canoe which is initially at rest on a frictionless lake. You then move forward (positive direction) in the canoe.

As a result of your motion, the momentum of the canoe becomes negative. True or False

Answer 1