According to present understanding, which of the following statements about the solar wind is not true?
A) It is even stronger today than it was when the Sun was young.
B) It helped in the transfer of angular momentum from the young Sun to particles that blew into interstellar space, which explains why the Sun rotates so slowly today.
C) It swept vast amounts of gas from the solar nebula into interstellar space.
D) It consists of charged particles blown off the surface of the Sun.
A
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The measured value of the speed of light is about 300,000 km/s. Suppose a futuristic space train is traveling at 200,000 km/s with its headlights on. If you could measure the speed of the light from the headlights, you would find it to be
A) 200,000 km/s. B) 100,000 km/s. C) 300,000 km/s. D) 500,000 km/s.
What distinguishes a conservative force from a non-conservative force?
What will be an ideal response?
Two cyclists who weigh the same and have identical bicycles ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob
Ignoring friction and wind resistance, which one of the following statements is true? A) The amount of work done by Joe is equal to the amount of work done by Bob, but the average power exerted by Joe is greater than that of Bob. B) The amount of work done by Joe is greater than the amount of work done by Bob, and the average power exerted by Joe is greater than that of Bob. C) Bob and Joe exerted the same amount of work, and the average power of each cyclist was also the same. D) The average power exerted by Bob and Joe was the same, but Joe exerted more work in getting there.
During a severe thunderstorm, it is advisable to
a. seek shelter under a tree. b. do laundry or watch TV. c. call someone on the phone. d. do none of these things.