Summary







































walker4
A person pushes with 50 N of force to separate two canoes that are initially at rest. If the person pushes for 1.20 s, find the magnitude of the momenta of each canoe after the push. Walker4e Example 9-3
A. 24 kg·m/s
B. 60 kg·m/s
C. 41.7 kg·m/s
D. The masses are required to answer this question.
Answer



















gc6 ex7-4
A 5.0 kg rifle fires a 0.020 kg bullet at 620 m/s. What is the recoil speed of the rifle?
A. 2.5 m/s
B. 0.40 m/s
C. 0.080 m/s
D. 12.4 m/s
Answer



















PoP5 8.15
A 25,000 kg railcar moving at 4.00 m/s collides and couples together with three identical cars moving in the same direction at 2.00 m/s. What energy is lost in the collision?
A. zero
B. 313 kJ
C. 50 kJ
D. 37.5 kJ
Answer



















PoP5 8.19
Block m1 = 5.00 kg is released from A and collides elastically with m2 = 10.0 kg, initially at rest at B. To what height will m1 rise after the collision?
A. 0.556 m
B. 0.875 m
C. 1.67 m
D. 5.00 m

Answer



















PoP5 8.33
The brown 0.300-kg puck is struck by the blue 0.200-kg puck going 2.00 m/s in the x direction. After the collision v1f = 1.00 m/s and θ = 53.0°. What is v2f?
A. 0.571 m/s
B. 0.882 m/s
C. 1.07 m/s
D. 1.40 m/s

Answer







































 



B. 60 kg·m/s


The change of momentum of each canoe equals the impulse that is delivered. The impulse is the product of the force and the time interval, so (50 N)(1.20 s) = 60 kg·m/s
























 



A. 2.5 m/s
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answer

D. 37.5 kJ




















answer

A. 0.556 m
solution equation



















answer

C. 1.07 m/s
solution equation