Where does the energy come from to create tidal bulges?
A) The Sun's gravity
B) The orbital and rotational motion of the Earth and Moon
C) The heat from Earth's core
D) The movement of the Earth's oceans.
E) The temperature difference between the Moon's surface and its core
B
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Which of the following best describes what we mean by a worm hole?
A) a hypothesized but unproven type of "tunnel" through hyperspace that connects distant points in the real universe B) a proven way of traveling through space faster than the speed of light C) a possible method of traveling through space faster than the speed of light D) a discarded idea about time travel that physicists now know to be impossible
How can we see through the dusty plane of the Milky Way disk in order to study star formation?
a) Use the radial velocity technique. b) Look at visible radiation from space with the Hubble Space Telescope. c) Use an optical telescope from the ground with a higher angular resolution. d) Look at infrared radiation with the Spitzer Space Telescope. e) Obtain a rotation curve using the gas in the Milky Way disk.
A bus is designed to draw its power from a rotating flywheel that is brought up to its maximum speed (3000 rpm) by an electric motor. The flywheel is a solid cylinder of mass 250 kg and radius 0.500 m (Icylinder = MR2/2). If the bus requires an average power of 10.0 kW, how long will the flywheel rotate?
a. 154 s b. 308 s c. 463 s d. 617 s
What's a decay chain?
a. a nuclear chain reaction b. one radioisotope decaying into another, which decays into another, and so on c. the triggering of multiple fissions by a single neutron d. none of the above