?.41 44%. 3:03 PM with velocity v-f-n ?, where n is a number (no units). What is

Question

?.41 44%. 3:03 PM with velocity v-f-n ?, where n is a number (no units). What is n? Answer Suhmit All Arawa 10.[1pt] A 144kg astronaut (including space suit) acquires a speed of 2.42m/s by pushin off with her legs from an 1920Kg space capsule. What is the change in speed of the space capsule? (Give your answer as a positive number to 3 significant digits.) Answer 11.[1pt] If the push lasts 0.520s, what is the magnitude of the average force exerted by each on the other? Answer 12. [1pt] Find the speed at which Superman (mass-87.0kg) must fly into a train (mass

Explanation / Answer

Using momentum conservation:

Pi = Pf

Pi = 0, since initially both astronaut and capsule are at rest

So, Pf = 0

m1*v1 + m2*v2 = 0

v2 = -(m1*v1/m2)

v2 = -144*2.42/1920 = -0.182 m/sec

Change in speed = 0 - (-0.182) = 0.182 m/sec

11

Avg force is given by:

F = dP/dt = m*dV/dt

Using known values:

F = 1920*0.1815/0.520

F = 670.15 N

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