The specific heat of an ideal gas at constant pressure is greater than the specific heat of an ideal gas at constant volume because
a. work is done by a gas at constant pressure.
b. work is done by a gas at constant volume.
c. no work is done by a gas at constant pressure.
d. the temperature remains constant for a gas at constant pressure.
e. the temperature remains constant for a gas at constant volume.
a
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A propeller is spun up from rest to 1500 rpm under the influence of a constant torque in 15.0s. If the work done by the engine in giving the propeller its final angular velocity is 25kJ, what is the torque supplied by the engine?
A. 21Nm B. 11 Nm C. 42 Nm D. 21 Nm E. 130 Nm
Modern astronomers suspect the corona is heated by
a. shock waves rising from below the photosphere. b. the solar wind. c. magnetic carpets. d. shock waves rising from below the photosphere, the solar wind, and the solar magnetic field. e. none of the others.
The following statements all refer to the human brain when mental activity is occurring. Which statement is correct?
a. In order to detect electric currents in the brain, you must open the skull and make direct electrical contact with the brain. b. The electric currents in the brain can be detected outside the brain by detecting the magnetic fields they produce. c. The electric currents in the brain can be mapped by shaving a person's head and dropping iron filings on the head. d. The electric currents in the brain produce an aura that can be detected visually. e. The electric currents in the brain cannot be detected by any means.
A supermassive black hole in the center of a galaxy typically represents ____ of the galaxy's total mass
a. a tiny fraction of a percent b. about a percent c. 1-5% d. 10% e. 50%