Loop A and a long, straight, current-carrying wire lie near each other on a tabletop in the top view shown below. Loop B is oriented perpendicular to the wire. 
Suppose that the current in the wire suddenly decreases. In what direction does the induced current flow in
A. Clockwise.
B. Counterclockwise.
C. No current flows in this loop.
D. One needs more information to answer.
B. Counterclockwise.
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According to the well-known equation E = mc2,
A) mass and energy travel at the speed of light squared. B) energy is actually mass traveling at the speed of light squared. C) mass and energy travel at twice the speed of light. D) mass and energy are related. E) none of the above
A particle is acted upon by only two forces, one conservative and one nonconservative and neither being a force of friction, as it moves from point A to point B. The kinetic energies of the particle at points A and B are equal if
a. the sum of the works of the two forces is zero. b. the work of the conservative force is equal to the work of the nonconservative force. c. the work of the conservative force is zero. d. the work of the nonconservative force is zero. e. None of the above.
Friction: Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis produce a forward thrust of 200 N and have a coefficient of kinetic friction with water of 0.10. Unfortunately, the skis run out of fuel after only 90 s. What is Jason's top speed?
A. 150 m/s B. 240 m/s C. 24 m/s D. 90 m/s
Aluminum has a higher specific heat capacity than iron. This means that for equal masses of aluminum and iron, the metal that heats more quickly when the same amount of heat is applied is
A) aluminum. B) iron. C) need more information