A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, the person's power output is
a. 0
b. 3 W
c. 30 W
d. 1,200 W
e. 12,000 W
D
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What is the result when gas clouds from both of the colliding galaxies meet?
A: The clouds, being very diffuse, pass through each other just like stars pass by each other without interacting. B: The clouds crushing down on each other starts a burst of new star formation. C: They smash each other into bits and end up spread out in many directions. D: Huge, galaxy-spanning lightning bolts strike out from their collision, destroying many nearby stars. E: They collect into one big cloud but nothing else happens.
Pulsars are thought to be
A) accreting white dwarfs. B) rapidly rotating neutron stars. C) unstable high-mass stars. D) accreting black holes.
For large mass number nuclei which are stable, the ratio of protons to neutrons is
a. equal to 1 b. greater than 1 c. less than 1 d. unrelated to the stability of nuclei e. almost 2 to 1
One unusual aspect of dark energy is
A) its pushes outward on everything in the universe instead of pulling inward as gravity ordinarily does. B) it's made of a material that has not yet been observed in our laboratories. C) Both of the above. D) it exerts no gravitational force. E) it exerts a new kind of fundamental force, never observed before.