You can raise the temperature of an object with
A. microwaves.
B. infrared waves.
C. ultraviolet rays.
D. all of the above.
E. only (a) and (b) above.
Answer: D
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Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is (the initial velocity of the 6.00 kg mass is up the incline)
A. 7.16 
B. 5.84
C. 2.98
D. 1.53
E. 3.90
Gravitational equilibrium means that the surface and the core of the Sun are at the same pressure
Indicate whether the statement is true or false
A contact lens is made of plastic with an index of refraction of 1.50 . The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm. What are the focal length and the power of the lens?
To get the same exposure on the film, when the aperture diameter of a camera lens is doubled, what change should be made in the shutter speed?
A. it should be doubled B. it should be halved C. it should be quadrupled D. it should be quartered E. it should be reduced by a factor of 1.414