If a proton and an electron have the same momentum, the longer wavelength belongs to the
A) proton.
B) electron.
C) both the same
Answer: C
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Dana uses a rope to pull a box that weighs 600 N across a level surface with constant velocity. The rope makes an angle of 40° above the horizontal and the tension in the rope is 400 N. What is the coefficient of friction?
a. 0.89 b. 0.88 c. 2.00 d. 1.19 e. 0.84
A blimp is filled with 200 m3 of helium. How much mass can the balloon lift? The density of helium is one-seventh that of air, and the density of air is 1/800 that of water. Consider the mass of the balloon to be negligible
a. 115 kg b. 214 kg c. 315 kg d. 415 kg e. 37 kg
How should 
for an ideal gas?
A. 
B. 
C. 
D. One cannot tell without careful calculation.
The radiation our eyes are most sensitive to is the color
A) black at 227 nm. B) blue at 4,321 nm. C) violet at 7,000 Angstroms. D) yellow-green at about 550 nm. E) red at 6563 Angstroms.