Which of the following is not true about potential energy?
a. Potential energy is stored energy. b. Potential energy is related to position.
c. Potential energy is a scalar quantity. d. Potential energy has direction.
d
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Approximately how many times does an average human heart beat in a year?
A) 4 × 105 B) 4 × 106 C) 4 × 107 D) 4 × 108 E) 4 × 109
The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called
a. an achromatic lens. b. active optics. c. a Schmidt-Cassegrain design. d. a Newtonian design. e. interferometry.
Density: The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density (mass divided by volume) of Mars in kilograms per cubic meter?
A. 9.76 × 102 kg/m3 B. 1.95 × 103 kg/m3 C. 3.90 × 103 kg/m3 D. 7.81 × 103 kg/m3
A ceiling fan is turned on and reaches an angular speed of 60 rev/min in 20 s. It is then turned off and coasts to a stop in 40 s. In the one minute of rotation, through how many revolutions did the fan turn?
a. 30 c. 0 b. 60 d. 600