The angular momentum of a particle moving in a circle around a point is equal to:
a. half of the rotational inertia times the square of the rotational speed.
b. the mass times the speed of the particle times the radius of its orbit.
c. the sum of its kinetic and potential energies.
d. half its mass times the square of its speed.
e. its mass times its velocity.
b
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Suppose that you place a loop with its face perpendicular to a uniform magnetic field. If the magnetic field points directly at you as you look at the loop, in what direction does the induced current flow around the loop if the magnetic field is static.
A. The induced current flows clockwise. B. The induced current flows counterclockwise. C. No current flows in the loop. D. A current flows, but one needs additional information to determine the direction in which it flows. E. One needs additional information to determine even whether a current flows or not.
Reverberation is a phenomenon you would be most likely to hear if you sing in
A) the shower. B) a small drape-covered room. C) a large drape-covered room. D) the desert.
In pair creation,
A) matter is conserved but energy is created. B) two oppositely-flavored pizzas are created. C) matter and energy are both conserved. D) matter and energy are both created. E) matter is created but energy is conserved.
A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will
A) contain only a north pole. B) contain a north pole on the right and a south pole on the left. C) contain only a south pole. D) no longer contain any poles.