Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The power you supply to the crate is Fd/t
Indicate whether the statement is true or false
T
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Which of the following statements is true of coronal holes?
A) Open magnetic fields allow ionized gas to flow away as the solar wind. B) Reconnection events prevent the release of ionized gases outward from the corona. C) Discharge of solar materials is prevented because the region is extremely thick. D) Magnetic field loops back into the Sun to trap the solar wind.
Suppose you put two protons near each other. Because of the electromagnetic force, what will the two protons do?
A) vollide B) remain stationary C) attract each other D) repel each other E) join together to form a nucleus
"Spurs" are probably the result of ____
a. self-sustaining star formation b. spiral density waves c. differential rotation d. the central galactic bar e. the short lifetime of O stars
According to our theory of solar system formation, why do all the planets orbit the Sun in the same direction and in nearly the same plane?
A) The laws of conservation of energy and conservation of angular momentum ensure that any rotating, collapsing cloud will end up as a spinning disk. B) The original solar nebula happened to be disk-shaped by chance. C) Any planets that once orbited in the opposite direction or a different plane were ejected from the solar system. D) Luck explains it, as we would expect that most other solar systems would not have all their planets orbiting in such a pattern. E) The Sun formed first, and as it grew in size it spread into a disk, rather like the way a ball of dough can be flattened into a pizza by spinning it.