Pairs of forces of equal magnitude act on identical cylinders as shown in the figures. In which example is the cylinder in translational and rotational equilibrium?
a.
b.
b
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Which of the following best explains the phenomenon of black hole evaporation?
A) Due to high temperatures in the accretion disk around a black hole, material evaporates from the black hole like water evaporating from the ocean. B) Particles (or antiparticles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. C) Particles (or antiparticles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. E) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists but doesn't really occur.
One rad is
a. the amount of radiation that deposits 10?2 J of energy into 1 kg of absorbing material. b. the amount of ionizing radiation that will produce 1/3 × 10^?9 C of electric charge in 1 cm3 of air under standard conditions. c. the amount of radiation needed for ionization of an atom. d. the amount of radiation needed for dissociation of a molecule. e. the amount of radiation that deposits one erg of energy in 1g of material.
How is the Moon's crust similar to Earth's?
A. New lunar crust is forming at plate boundaries. B. The lunar crust is thicker on one side than the other. C. Volcanic activity produced most of the craters on the Moon. D. The lunar crust is mostly silicate rock. E. All of these choices are correct.
A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two vertical wires which conduct a current I = 8.0 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire?
A. 0.15 N B. 0.68 N C. 0.30 N D. 0.34 N E. 0.10 N