Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air. As time progresses, the difference in their speeds
A) increases.
B) remains constant.
C) decreases.
D) cannot be determined from the information given.
B
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Buoyancy: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the buoyant force B on this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
In a hydrogen atom, a given electron has l = 7. How many values can m have?
A) 6 B) 7 C) 15 D) 33 E) 98
Energy Conservation With Nonconservative Forces: As shown in the figure, a 4.0-kg block is moving at 5.0 m/s along a horizontal frictionless surface toward an ideal spring that is attached to a wall. After the block collides with the spring, the spring is compressed a maximum distance of 0.68 m. What is the speed of the block when the spring is compressed to only one-half of the maximum distance?
Fill in the blank(s) with the appropriate word(s).
If the plane x = 4 m is an equipotential surface, in which of the following directions can the electric field be in the region immediately adjacent to this plane?
a. the positive y direction b. both the positive and negative z directions c. the positive x direction d. more than one of these choices