A fundamental force in nature is the
a. strong interaction.
b. weak interaction.
c. electromagnetic interaction.
d. gravitational interaction.
e. all of the above
e
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A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
a. There is an residual upward force from the hand on each ball. b. There is a greater residual force from the hand on A than there is on B. c. Only gravity acts on B but there is an additional residual force from the hand on A. d. There is an additional downwards force besides gravity on each ball. e. The only force acting on each ball is the gravitational force.
When a body moves in circular motion at constant speed, the velocity and acceleration point __________
Fill in the blank(s) with correct word
It is late and Carlos is sliding down a rope from his third floor window to meet his friend Juan. As he slides down the rope faster and faster, he becomes frightened and grabs harder on the rope, increasing the tension in the rope. As soon as the upward tension in the rope becomes equal to his weight:
a. Carlos will stop. b. Carlos will slow down. c. Carlos will continue down at a constant velocity. d. the rope must break.
The loops shown below are immersed in a uniform magnetic field parallel to the plane of the drawing. (The step vector shown is a typical one for each loop.)
A. 
B. 
C. 
D. 
E. E