When an inflated balloon is released with its end unsealed and takes off across the room, how is momentum conserved?
a. Momentum is conserved because the balloon is displacing atmosphere molecules from the air around it.
b. Momentum is conserved because the balloon is getting smaller.
c. Momentum is conserved because the balloon is getting larger.
d. Momentum is conserved because the air molecules inside the balloon are moving out in the opposite direction from the balloon's movement.
e. Momentum is conserved because the air from the balloon pushes the air behind it.
Question 2
In this photo, a fire extinguisher provides the impulse for a hallway rocket cart. Which is NOT true about the motion of the rocket cart and person?
a. The momentum of the cart and person is equal in magnitude and opposite in direction to the momentum of the expelled gas.
b. The cart and person are propelled as a result of gas from the fire extinguisher pushing against air in the room.
c. The force of the gas on the cart and person is equal and opposite to the force of the person and cart on the expelled gas.
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