If the growth rate of the number of solar collectors is 7% per year, then 1000 units in use in 2010 will grow to _______ units by the year 2040
a. 1200 b. 2000 c. 4000 d. 8000 e. 20,000
d
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A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
A. rotating clockwise and slowing down. B. rotating counterclockwise and slowing down. C. rotating clockwise and speeding up. D. rotating counterclockwise and speeding up. E. first rotating clockwise and then counterclockwise.
Which of the following is evidence for supermassive black holes in active galaxies?
A) the discovery of powerful jets coming from a compact core B) rapid changes in the luminosity of the galaxy nucleus C) quasars emit approximately equal power at all wavelengths from infrared to gamma rays D) very high speed orbital motions around galactic nuclei E) all of the above
The proper order of the layers of a generic atmosphere from lowest altitude to highest is
A) troposphere, stratosphere, exosphere, thermosphere. B) troposphere, stratosphere, thermosphere, exosphere. C) stratosphere, troposphere, exosphere, thermosphere. D) stratosphere, troposphere, thermosphere, exosphere. E) none of the above
Is it possible for the total mechanical energy of a moving particle to be negative?
a. No, because a moving particle has positive kinetic energy. b. No, because potential energy cannot have a value more negative than the value of the positive kinetic energy of the particle. c. Only if friction is involved. d. yes