FARMINGDALE STATE COLLEGE-DR.RONALD PIRICH 9. A bowling ball and a ping-pong bal
ID: 2032708 • Letter: F
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FARMINGDALE STATE COLLEGE-DR.RONALD PIRICH 9. A bowling ball and a ping-pong ball are rolling toward you with the same momentum.If you exert the same force to stop each one, for which is the stopping distance greater? a. the bowling ball b. same distance for both c. the ping-pong ball d. impossible to say 10. A system of particles is known to have a total kinetic energy of zero. What can you say about the total momentum of the system? a. momentum of the system is positive b. momentum of the system is negative c. momentum of the system is zero d. you cannot say anything about the momentum of the system Computation Questions (20 points each) 1. An astronaut in her space suit has a total mass of 87.0kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she's on a spacewalk. Initially at rest with respect to her spacecraft, she throws her 12.0-kg oxygen tank away from her spacecraft with a speed of 8.00 m/s to propel herself back toward it, as shown in Figure 1. Determine (a) her speed after throwing the oxygen tank away and (b) the maximum distance she can be from the craft and still return within 2.00 min (the amount of time the air in her helmet remains breathable)- recall the distance she will move in 2.00 min is given by d Vast (120 s). Please show all your work. 8.00 m/s 75.0 kg 20kgExplanation / Answer
linear momentum before throwing Pi = 0
momentum after throwing Pf = Mastronaut*vastronaut + Mtank*Vtank
total linear momentum is conserved
Pf = Pi
Mastronaut*vastronaut + Mtank*Vtank = 0
75*vastronaut + 12*8 = 0
Vast = -1.28 m/s
vast = 1.28 m/s
the astronaut moves towards the craft
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part(b)
distance = vast*t = 1.28*120 = 153.6 m
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