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.
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.
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