Which of the following is most like the rotation of stars in the disk of the Milky Way?
A) a DVD in a player
B) the planets in our solar system
C) cars moving at a constant speed on a circular race track
D) the hands of an analog clock
E) the tire of a car moving
C
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How would an inflated landing module bounce if it were dropped ontothe surface ofEarth from the same altitude as it was on Mars?
a) It would bounce higher sometimes and lower sometimes on the surface of Mars. b) It would not bounce at all. c) It would bounce higher and slower than it did on the surface of Mars. d) It would bounce lower and fewer times than it did on the surface ofMars. e) It would bounce higher and more times than it did on the surface ofMars.
Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 3.00 × 1030 W and has a surface temperature of 3000 K
Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4). A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.30 × 1011 m
An object moving in a circle undergoes
a. constant acceleration b. free fall c. centripetal acceleration d. linear acceleration e. frequency
The two photons produced in an electron-positron annihilation have equal but oppositely-directed momenta to match the zero momentum of the electron-positron pair. Which of the following conservation laws are obeyed in the pictured interaction?
a. Conservation of energy. b. Conservation of momentum. c. Conservation of charge. d. Both a. and b. but not c. e. All of a., b. and c.