As a 3.0-kg bucket is being lowered into a 14-m-deep well, starting from the top, the tension in the rope is 9.0 N. The acceleration of the bucket will be:
a. 6.8 m/s2 downward.
b. 9 m/s2 downward.
c. zero.
d. 3.0 m/s2 upward.
e. 6.8 m/s2 upward.
a
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On the autumnal equinox the sun is
a. north of the celestial equator. b. south of the celestial equator. c. on the celestial equator and moving north with respect to the equator. d. on the celestial equator and moving south with respect to the equator. e. closest to the north celestial pole.
The visible surface of the Sun is composed of solid matter
a. True b. False Indicate whether the statement is true or false
At the microscopic level, electric currents in wires are due to
A) electromagnetic radiation. B) the great pumpkin. C) protons [and possibly other ions] traveling along the wire. D) atoms jiggling back and forth within the wire. E) electrons traveling along the wire.
An electrical power plant manages to send 90% of the heat produced in the burning of fossil fuel into the water-to-steam conversion. Of the heat carried by the steam, 40% is converted to the mechanical energy of the spinning turbine. Which of the following choices best describes the overall efficiency of the heat-to-work conversion in the plant (as a percentage)?
a. greater than 90% b. 65% c. less than 40% d. 40% e. 90%