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Change in Momentum Two System Object
Moderate
Accuracy 20
S
Two boxes are sliding toward each other on a friction-less table with initial conditions given in the image. The two boxes collide in
an elastic collision.
uct:
v=8 m/s
E
Tu
v=10 m/s
m=10 kg] =>
m=30 kg
11 C
Created for Albertio. Copyright 2017. All right reserved.
2
Which of the following indicates the change in momentum of the system after the collision?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

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