In a 1-g gravitational field, in 1 s, a light beam will curve beneath a perfectly straight line by
A) much less than 4.9 m.
B) about 4.9 m.
C) much more than 4.9 m.
Answer: B
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The "energy efficiency" of a device is
A) the total energy put into the device divided by its useful energy output. B) its thermal energy output divided by the total energy put into the device. C) its total energy output divided by the total energy put into the device. D) its useful energy output divided by the total energy put into the device. E) the total energy put into the device divided by its thermal energy output.
Engines, including car engines, are rated in horsepower. What is horsepower?
(a) The force needed to start the engine. (b) The force needed to keep the engine running at a steady rate. (c) The energy the engine needs to obtain from gasoline or some other source. (d) The rate at which the engine can do work. (e) The amount of work the engine can perform
A 14-kg block rests on a level frictionless surface and is attached by a light string to a 5.0-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s2, what is the tension in the connecting string?
a. 2.6 N b. 21 N c. 49 N d. 36 N e. 190 N
Uniform Electric Fields: A region of space contains a uniform electric field, directed toward the right, as shown in the figure. Which statement about this situation is correct?
A. The potential at all three locations is the same. B. The potentials at points A and B are equal, and the potential at point C is higher than the potential at point A. C. The potential at points A and B are equal, and the potential at point C is lower than the potential at point A. D. The potential at point A is the highest, the potential at point B is the second highest, and the potential at point C is the lowest.