Which of the following best describes what would happen if a 1.5-solar-mass neutron star, with a diameter of a few kilometers, were suddenly (for unexplained reasons) to appear in your home town?
A) The entire Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star.
B) It would rapidly sink to the center of Earth.
C) The combined mass of Earth and the neutron star would cause the neutron star to collapse into a black hole.
D) It would crash into Earth, throwing vast amounts of dust into the atmosphere that, in turn, would cool Earth; this is probably what caused the extinction of the dinosaurs.
A
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John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass of the shovel. Sarah says that his hand pushing down on the shovel must be exerting a greater force than the hand pushing up. James says it is just the reverse. Which one, if either, is correct?
A. Sarah, because the hand pushing down must exert a greater force to match the torque exerted by the snow. B. James, because, depending on the location of the axis of rotation, the hand pushing down can counteract the torque exerted by the snow. C. James, because the hand pushing up must exert a force that equals the sum of the force of the hand pushing down and the weight of the snow. D. James, because both (b) and (c) above are correct. E. Neither, because the hands exert forces of equal magnitudes.
Explain why California would mandate the installation of catalytic converters in cars at a time when their use cost energy and degraded performance
What will be an ideal response?
The mass of a proton at rest is m. If the proton is moving so fast that its total energy is four times its rest energy, then what is the kinetic energy of the proton?
a. 3mc2 c. 2mc2 b. mc2 d. 4mc2
A conducting sphere of radius 20.0 cm carries an excess charge of +15.0 µC, and no other charges are present
(k = 1/4??0 = 8.99 × 109 N • m2/C2 ) The potential (relative to infinity) due to this sphere at a point 12.0 cm from its center is closest to A) zero. B) 674 kV. C) 1130 kV. D) 3380 kV. E) 9380 kV.