A puck on a frictionless air hockey table has a mass of 5.0 kg and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The angular momentum of the puck (in kg?m2/s) is 
A. 80
B. 20
C. 30
D. 60
E. 50
Answer: D
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One piece of evidence for the waviness of matter is
A) the tiny individual impacts that show up in the double-slit experiment with electrons. B) the random motion of electrons that is observed with powerful microscopes. C) the interference pattern that shows up in the double-slit experiment with light. D) the interference pattern that shows up in the double-slit experiment with electrons. E) the uncertainty that is evident in the outcome of the double-slit experiment with electrons.
A solar heated house loses about 7.4 × 10^7 cal through its outer surfaces on a typical 24-hour winter day. What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62°C by the solar collectors, and the house is maintained at 20°C? (Specific heat of rock is 0.21 cal/g • °C.)
a. 160 kg c. 6100 kg b. 1200 kg d. 8400 kg
Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, compared with the wider tube, mercury in the smaller tube will rise
A) to the same height. B) twice as high. C) four times as high. D) more than four times as high. E) none of the above
It is observed that a negatively charged grain of soot released between the parallel plates of a capacitor moves leftward. The direction of the electric field between the capacitor plates is ________.
What will be an ideal response?