A plano-convex lens is to have a focal length of magnitude 40 cm, and it is made of glass of index of refraction 1.65. What radius of curvature is required?
A) 32 cm B) 26 cm C) 13 cm D) 36 cm
B
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A negatively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomes
A) positively charged. B) negatively charged. C) partially discharged. D) completely discharged. E) none of the above
As an object is lowered into a deep hole in the surface of the Earth, which of the following must be assumed in regard to its potential energy?
a. increase b. decrease c. remain constant d. cannot tell from the information given
A horizontal wooden beam sags a bit when supported at its ends. In between the top and bottom surfaces is a region of
A) tension. B) compression. C) neither of these
Albert Michelson is primarily remembered for
A) proving length contraction. B) not being able to detect an "ether". C) his theory published in 1916. D) proving that the speed of light is not constant. E) proving time dilation.