A copper sphere, 10 cm in diameter, is subjected to a pressure of 1.0 × 106 N/m2. What is the change in the diameter of the sphere? The bulk modulus for copper is 1.4 × 1010 N/m2
A) 2.2 × 10-6 m
B) 2.2 × 10-7 m
C) 7.1 × 10-6 m
D) 7.1 × 10-7 m
E) 7.1 × 10-8 m
B
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Graphical Analysis: A child standing on a bridge throws a rock straight down. The rock leaves the child's hand at time t = 0 s. If we take upward as the positive direction, which of the graphs shown below best represents the acceleration of the stone as a function of time?
A. A B. B C. C D. D E. E
The intensity of the waves from a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?
A) 4I B) 2I C) I/2 D) I/4 E) I/
A 3.50-kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
According to the supermassive black hole hypothesis, how is the energy that powers active galactic nuclei produced?
A) by nuclear fusion near the central black hole B) by magnetic fields that trap and accelerate charged particles C) by the impact of jets being shot out of the central black hole D) by converting the gravitational potential energy of infalling matter to kinetic energy and thermal energy E) by matter—antimatter annihilation