When a gun is fired, which has the greater kinetic energy: the bullet or the recoiling gun?
What will be an ideal response?
The bullet
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Which of the following is not a cause of wrinkles?
a. thinning of the epidermal layer b. collagen fibers losing flexibility c. elastin fibres keeping skin more stretched d. losing the underlying layer of fat
Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 7.0 kg and the other mass, 
has a mass of 3.0 kg. The pulley turns on a shaft through the center of the pulley and supports the pulley and all the masses. The vertical force of the shaft on the pulley that supports the whole system is
A. 49 N upward.
B. 49 N downward.
C. 82 N upward.
D. 82 N downward.
E. 98 N upward.
The force on the walls of a vessel of a contained gas is due to:
A. the repulsive force between gas molecules B. a slight loss in the speed of a gas molecule during a collision with the wall C. a change in momentum of a gas molecule during a collision with the wall D. elastic collisions between gas molecules E. inelastic collisions between gas molecules
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes b. 80 minutes c. 90 minutes d. 70 minutes e. 60 minutes