When an object 1.15 cm tall is placed 12 cm from a lens, the lens produces an upright image of the object that is 5.75 cm tall. What is the focal length of the lens?
A) 24 cm
B) 18 cm
C) 60 cm
D) 15 cm
E) 9.0 cm
D
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Object A (mA = 1.0 kg) hangs at rest from an ideal string A connected to the ceiling. Object B (mB = 2.0 kg) hangs at rest from an ideal string B connected to object A. The tension on string A is
A. Twice the tension on string B
B. 1.5 times the tension on string B
C. Equal to the tension on string B
D. 
the tension on string B
E. Other (specify)
If there is a net torque on a wheel, then
A. the wheel cannot be spinning. B. the angular momentum of the wheel cannot change direction. C. there must be a net force on the wheel. D. the wheel must have a nonzero angular acceleration.
Two identical small charged spheres are a certain distance apart, and each initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually diminishes on both spheres
When each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be A) 1/16 F B) 1/8 F C) 1/4 F D) 1/2 F
What key evidence suggests that Triton is a captured moon?
A) Triton orbits Neptune in a direction opposite that of Neptune's rotation. B) Triton is small and potato-shaped, which is common of captured moons. C) Triton is too large to have been formed in the "miniature solar nebula" thought to have surrounded Neptune in its early history. D) Triton appears to be made mostly of ice.