On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary
When the spring is most compressed, both objects are moving at the same speed. Ignoring friction, what is conserved during this interaction?
A) momentum and mechanical energy
B) momentum only
C) kinetic energy only
D) momentum and kinetic energy
E) momentum and potential energy
Answer: A
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Why does the Big Bang theory predict that the cosmic background radiation should have a perfect thermal radiation spectrum?
A) The background radiation came from the heat of the universe, with a peak corresponding to the temperature of the universe. B) The spectrum of pure hydrogen is a perfect thermal radiation spectrum. C) The spectrum of 75 percent hydrogen and 25 percent helium is a perfect thermal radiation spectrum. D) The light from all the stars and gas in the sky averaged over the entire universe is a perfect thermal radiation spectrum. E) It doesn't predict that the cosmic background radiation should have a perfect thermal radiation spectrum.
A Ferris wheel rotating at 20 rad/s slows down with a constant angular acceleration of magnitude 5.0 rad/s2. How many revolutions does it make while slowing down before coming to rest?
A) 3.2 B) 40 C) 6.4 D) 20
The spectra of different elements can be distinguished because
a. they have the same spectral lines, but the lines are of different intensities. b. they have spectral lines in different positions. c. every element has one unique spectral line. d. none of the above
Characteristic K X-rays are the result of:
a. inner electron transitions. c. nuclear electron states. b. outer electron transitions. d. buckytubes.