A nearsighted person wears contact lenses having a power of -0.15 diopters. What is the person's uncorrected far point?
A) 1.5 m
B) 3.3 m
C) 6.0 m
D) 6.7 m
D
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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 original solar nebula happened to be disk shaped by chance. B) Any planets that once orbited in the opposite direction or a different plane were ejected from the solar system. C) The laws of conservation of energy and conservation of angular momentum ensure that any rotating, collapsing cloud will end up as a spinning disk. D) 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. E) It is a coincidence, as we would expect that most other solar systems would not have all their planets orbiting in such a pattern.
An organ pipe open at both ends has a length of 0.800 m. If the velocity of sound in air is what are the frequencies of the second and third harmonics?
What will be an ideal response?
Two small balls, A and B, attract each other gravitationally, exerting a force of magnitude F on each other
If we now double both masses and the separation of the balls, what will now be the magnitude of the attractive force that they exert on each one? A) 16F B) 8F C) 4F D) F E) F/4
A surprising demonstration involves dropping an egg from a third-floor window to land on a foam-rubber pad 2 in (5 cm) thick without breaking. If a 56-gram egg falls 12 m, and the foam pad stops the egg in 6.25 ms, by how much is the pad compressed?