Central black holes can be very efficient for converting the mass-energy of infalling matter to thermal energy in the accretion disk
Roughly what percentage of the mass-energy can be converted to other forms of energy as matter falls into a black hole? A) 0.7%
B) 1% - 4%
C) 10 - 40%
D) 100%
C
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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. the same at all times. B. proportional to l1, the length of string from the pulley to m1. C. proportional to l2, the length of string from the pulley to m2. D. conserved because the Earth doesn't move. E. proportional to the speed of the blocks.
Erwin Schrodinger
A) suggested the existence of matter waves (1924). B) discovered the positron using a cloud chamber (1932). C) was the first to produce diffraction patterns of electrons in crystals (1927). D) developed a wave equation for matter waves (1926). E) set the limits on the probability of measurement accuracy (1927).
Humans’ use of rocks and minerals as building materials is an example of which interaction?
Two strings are, respectively, 1.00 m and 2.00 m long. Which of the following wavelengths, in meters, could represent harmonics present on both strings?
A. 0.800, 0.670, 0.500 B. 1.33, 1.00, 0.500 C. 2.00, 1.00, 0.500 D. 2.00, 1.33, 1.00 E. 4.00, 2.00, 1.00