Fusion processes in stellar cores involving heavy elements ____
a. generate more energy per atom than fusion of lighter elements
b. generate less total energy because less atoms are available
c. generate energy for longer periods of time for heavier elements
d. occur in shells further and further from the center of the core
e. occur in larger and larger volumes of the core
b
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What is a useful result of the discovery that Charon occasionally eclipses Pluto?
A. It showed that eclipses occur in other parts of the Solar System. B. It allowed astronomers to image surface features of Pluto. C. It allowed astronomers to measure the distance between Pluto and Charon. D. It allowed astronomers to determine the size of Pluto and Charon more accurately.
A 1.5-kg mass attached to spring with a force constant of 20.0 N/m oscillates on a horizontal, frictionless track. At t= 0, the mass is released from rest at x= 10.0 cm. (That is, the spring is stretched by 10.00 cm
) (a) Determine the frequency of the oscillations. (b) Determine the maximum speed of the mass. Where does the maximum speed occur? (c) Determine the maximum acceleration of the mass. Where does the maximum acceleration occur? (d) Determine the total energy of the oscillating system. (e) Express the displacement as a function of time.
A 120-V rms voltage at 2000 Hz is applied to a 6.0-mH inductor, a 2.0-?F capacitor and a 200-? resistor. What is the rms value of the current in this circuit?
A) 1.5 A B) 0.48 A C) 2.5 A D) 3.5 A E) 0.59 A
When a wheel is rolling without slipping, the magnitude of its velocity relative to the ground is greatest at
a. the point in contact with the ground. b. the point at the center of the wheel. c. the point at the top of the wheel opposite to the point in contact with the ground. d. the point farthest forward from the center of mass of the wheel. e. the point farthest behind the center of mass of the wheel.