What is the approximate temperature of the universe (as a whole) today?
A) 3K
B) 3000K
C) 300K
D) The universe cannot be said to have a single temperature.
A) 3K
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Similar to our Sun, pulsars' rotations are believed to slow down because
a. they are losing angular momentum into space via outward streaming particles. b. they are dragging companion stars around in their magnetic field. c. they are getting tired. d. of conservation of angular momentum. e. their mass is increasing.
If two electrons are entangled, then
A) if one particle suddenly alters its wave packet, the other must also. B) both are part of a single matter wave. C) Both of the above. D) they must exert forces on each other. E) All of the above.
Length Contraction: A really high-speed train moves in a direction parallel to its length with a speed that approaches the speed of light. The length of the train, as measured by a stationary observer on the ground,
A. approaches infinity. B. increases due to the motion. C. decreases due to the motion. D. is not affected by the motion.
A car travels at 17m/s without skidding around a 35m radius unbanked curve. What is the minimum value of the static friction coefficient between the tires and the road?
A. 0.84 B. 0.050 C. 0.0014 D. 0.024