What is the effect of resonance on Mercury's rotation?
A. Mercury's spin has slowed down.
B. Mercury spins three times on its axis for every two orbits.
C. Mercury shows the same face to the Sun when Mercury is closest to it.
D. All of these choices are correct.
Answer: B
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A peregrine falcon dives at a pigeon. The falcon starts with zero downward velocity and falls with the acceleration of gravity. If the pigeon is 76.0 m below the initial height of the falcon, how long does it take the falcon to intercept the pigeon?
What will be an ideal response?
The sun will eventually become a supernova
Indicate whether the statement is true or false
If you push a 4-kg mass with the same force that you push a 10-kg mass from rest, then
A) both masses accelerate at the same rate. B) the 10-kg mass accelerates 2.5 times faster than the 4-kg mass. C) the 4-kg mass accelerates 2.5 times faster than the 10-kg mass. D) the 10-kg mass accelerates 4 times faster than the 4-kg mass. E) the 4-kg mass accelerates 4 times faster than the 10-kg mass.
During a period of high solar activity, the corona
A) becomes smooth and even. B) cools almost to the temperature of the photosphere. C) disappears. D) shrinks to half its normal size. E) is more irregular.