With each pass of a comet about the Sun, its masss
A) is appreciably reduced.
B) remains virtually unchanged.
C) actually increases.
Answer: A
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Figure OQ31.2 is a graph of the magnetic flux through a certain coil of wire as a function of time during an interval while the radius of the coil is increased, the coil is rotated through 1.5 revolutions, and the external source of the magnetic field is turned off, in that order. Rank the emf induced in the coil at the instants marked A through E from the largest positive value to the
largest-magnitude negative value. In your ranking, note any cases of equality and also any instants when the emf is zero.
In comparing first magnitude Deneb with second magnitude Polaris, we find that:
A) Polaris is in reality much more luminous. B) Deneb must be much hotter than Polaris. C) Deneb appears 2.5 times brighter to us than does Polaris. D) Polaris is really 100 times brighter than nearby Deneb. E) Deneb is really much closer than Polaris.
A firecracker breaks up into several pieces, one of which has a mass of 200 g and flies off along the x-axis with a speed of 82.0 m/s. A second piece has a mass of 300 g and flies off along the y-axis with a speed of 45.0 m/s
What are the magnitude and direction of the total momentum of these two pieces? A) 361 kg•m/s at 56.3° from the x-axis B) 93.5 kg•m/s at 28.8° from the x-axis C) 21.2 kg•m/s at 39.5° from the x-axis D) 361 kg•m/s at 0.983° from the x-axis E) 21.2 kg•m/s at 56.3° from the x-axis
Binary black holes have much higher masses than their white dwarf and neutron star counterparts, which should lead to a much stronger emission of gravitational waves
What is the most reasonable explanation for why we have not yet observed gravitational waves from black-hole binaries? A) Black hole binaries are very rare, and wave detection is difficult. B) The waves disappear into the black hole. C) The waves must be coming from very far away and haven't reached us yet. D) Our current theories must be wrong.