One of the curators at the art museum is tilting a large cylinder backward. At what angle ? will the cylinder of height h and radius r be in unstable equilibrium?
A.
.B.
.C.
.D.
.E.
.Answer: C
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Determine the overall heat transfer coefficient based on the inside diameter of the tube and shell heat exchanger shown in the figure.
What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
A) They respond to the weak force but not to the electromagnetic force, which means they cannot emit light. B) The light that they emit is so weak that it is undetectable to our telescopes. C) They are only weakly bound by gravity, which means they can fly off and escape from galaxies quite easily. D) They interact with other matter only through the weak force and not through gravity or any other force.
Which of the following played the most important role in the ring's formation?
A) Saturn's differential rotation B) Saturn's Roche limit C) Saturn's distance from the Sun D) debris from volcanoes on Mimas E) tidal resonance with Titan
The continuous part of an x-ray spectrum of an atom occurs because
a. of photon absorption. b. of the photoelectric effect. c. electrons in the atom make transitions to lower energy levels. d. of the uncertainty principle. e. of rapid deceleration of the bombarding electrons.