Suppose that the gravitational force by Earth on the moon suddenly shut off. How would the moon then move?
A) It would go into a larger circular orbit.
B) It would move straight ahead in a straight line, at constant speed.
C) It would move directly outward, away from Earth.
D) It would slow down and stop.
E) It would move directly inward, toward Earth.
B
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Circular Motion of Charges: Alpha particles, each having a charge of +2e and a mass of 6.64 ×10-27 kg, are accelerated in a uniform 0.50 T magnetic field to a final orbit radius of 0.50 m. The field is perpendicular to the velocity of the particles. What is the kinetic energy of an alpha particle in the final orbit? (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C)
A. 3.0 MeV B. 2.6 MeV C. 3.4 MeV D. 3.9 MeV E. 4.3 MeV
The absolute temperature of an ideal gas is directly proportional to which of the following quantities?
A) the average speed of its molecules B) the average momentum of its molecules C) the average kinetic energy of its molecules D) the mass of its molecules E) It is proportional to all of the above quantities.
The amount of 
Ar is one-ninth the amount of 
K. If the half-life of the latter is T, what is the rock’s age?
A. T B. T/9 C. 9T D. ln(9T) E. T/ln 9 F. Some other result (specify)
Imagine that we have two identical metal spheres on insulating stands that we give the same negative charge. If we slowly bring the spheres closer and closer together, the charge per unit area ? on each sphere will at the point nearest the other sphere
A. become increasingly negative. B. become less negative. C. remain constant.