Stars lying above the main sequence that are relatively cool but very bright are called
a. red giants.
b. white dwarfs.
c. brown dwarfs.
d. pulsars.
a
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If the Moon rises around 3 A.M., its phase must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
A. The gravitational potential energy of the system is greatest at A and B. B. The kinetic energy of mass m is greatest at point O. C. The greatest rate of change of momentum occurs at A and B. D. All of the above are correct. E. Only (a) and (b) above are correct.
Semiconductor technology has been the basis for many new electronic devices
a. True b. False Indicate whether the statement is true or false
A vertical cylinder, closed at the bottom end, contains 0.0100 mol of ideal gas. It is fitted at the top with a piston that can move freely
The mass of the piston is 14.0 kg and the initial height of the piston above the bottom of the cylinder is 25 cm. What is the temperature of the gas? (R = 8.31 J/mol ? K) A) 290 K B) 413 K C) 3620 K D) 405 K E) 500 K