Physical Pendulum: A simple pendulum that consists of a small ball of mass m and a massless wire of length L swings with a period T. Suppose now that the mass is rearranged so that mass of the ball was reduced but the mass of the wire was increased, with the total mass remaining m and the length being L. What is true about the new period of swing? (There could be more than one correct choice.)
A. The new period is T because the total mass m has not changed.
B. The new period is T because the length L has not changed.
C. The new period is greater than T.
D. The new period is less than T.
E. The new period is T because neither L nor m have changed.
Answer: D
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Gravitational lensing
a. occurs when light passes near a massive object and is deflected by the object's gravitational field. b. can be used to determine the luminosity of a galaxy. c. occurs when the mass of a galaxy is greater than expected from the luminosity of the galaxy. d. occurs when the mass of a galaxy is less than expected from the luminosity of the galaxy. e. can be used to determine the recessional velocity of a galaxy.
If you exert a force F on an object, the force which the object exerts on you will
A) depend on whether or not the object is moving. B) depend on whether or not you are moving. C) depend on your mass. D) depend on the object's mass. E) always be -F.
If you were to travel at a speed close to the speed of light, you would notice which of the following?
A. Your pulse rate has decreased B. Your iPod plays music more slowly-everyone sounds like a baritone C. Your mass has increased D. You would notice all of the effects listed E. You would notice none of the effects listed because you are in an inertial frame
Air at 100ºF, 70% relative humidity is to be conditioned to 75ºF and 60% relative humidity. Determine the partial pressure of the water vapor in the air at both states, the amount of water removed per lbm of dry air, and the lowest temperature to which the air must be cooled to accomplish this conditioning process.
What will be an ideal response?