A surface explosion on a white dwarf, caused by falling matter from the atmosphere of its binary companion, creates what kind of object?
A) hypernova
B) nova
C) gamma ray burstar
D) type I supernova
E) type II supernova
B
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Exhibit 13-1
Two blocks of masses m1 and m2 are connected by a light cord that passes over a pulley of mass M, as shown. Block m2 slides on a frictionless horizontal surface. The blocks and pulley are initially at rest. When m1 is released, the blocks accelerate and the pulley rotates.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 13-1. The total angular momentum of the system of the two blocks and the pulley relative to the axis of rotation of the pulley is
A. proportional to the radius of the pulley. B. proportional to the speed of the blocks. C. proportional to the length of the string. D. to all of the above. E. only to (a) and (b) above.
Theoretical physicists have had the least success in combining which force with the electromagnetic force?
a. strong nuclear force b. weak nuclear force c. gravitational force d. electrical Coulomb force
When a collision is perfectly inelastic, then:
a. all the kinetic energy is conserved. b. all the kinetic energy is gone. c. the participants stick together. d. the total momentum is zero.
A slab of concrete and an insulating board are in thermal contact with each other. The temperatures of their outer surfaces are 68°F and 50°F. Determine the rate of heat transfer (in BTU/ft2/h) if the R values are 1.93 and 8.7 ft2/°F/h/BTU, respectively
a. 9.7 b. 2.5 c. 5.3 d. 1.7 e. 28