An object that hangs from the ceiling of a stationary elevator by an ideal spring oscillates with a period T. If the elevator accelerates upward with acceleration 2g, what will be the period of oscillation of the object?
A) 4T
B) 2T
C) T
D) T/2
E) T/4
C
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Induction: 
X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with each other. A positively charged rod R is brought close to X as shown in part (a) of the figure. Sphere Y is now moved away from X, as shown in part (b). What are the final charge states of X and Y?
A. Both X and Y are neutral. B. X is positive and Y is neutral. C. X is neutral and Y is positive. D. X is negative and Y is positive. E. Both X and Y are negative.
Which of the following best describes what we mean by gravitational lensing?
A) A massive object bends light beams that are passing nearby. B) A massive object scatters away the light of more distant objects. C) Gravity causes matter that would otherwise be dark to become visible. D) Telescope lenses are distorted by gravity.
Stellar parallax is the apparent
A) shift in position of nearby stars as the Earth moves around the Sun B) westward motion of a planet with respect to the background stars C) shift in position of nearby stars as the Sun moves about the center of the galaxy D) shift in position of nearby stars as the Earth rotates on its axis
Which of the following particles are not made up of quarks? (There could be more than one correct choice.)
A) alpha particle B) electron C) proton D) positron E) neutron