A skater extends her arms horizontally, holding a 5-kg mass in each hand. She is rotating about a vertical axis with an angular velocity of one revolution per second. If she drops her hands to her sides, what will the final angular velocity (in rev/s) be if her moment of inertia remains approximately constant at 5 kg×m2, and the distance of the masses from the axis changes from 1 m to 0.1 m?
a. 6
b. 3
c. 9
d. 4
e. 7
B
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If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A) 2.3 × 107 m/s B) 1.9 × 107 m/s C) 1.5 × 107 m/s D) 1.1 × 107 m/s
A rectangular steel plate with dimensions of 40.0 cm × 30.0 cm is heated from 14.0°C to 164.0°C. What is its change in area? (Coefficient of linear expansion for steel is 11 × 10^?6/C°.)
a. 8.96 cm2 b. 29.7 cm2 c. 3.96 cm2 d. 1.32 cm2 e. 9.90 cm2
An observation satellite for mapping purposes is placed in a low Earth orbit. In order to see the whole surface of the Earth, which would be the preferred orbit?
a. an equatorial orbit c. an orbit inclined 45° to the equator b. a polar orbit d. It doesn't matter since the Earth turns completely every 24 hours.
Consider the use of the terms "rotation" and "revolution". In physics:
a. the words are used interchangeably. b. the words are used interchangeably but "rotation" is the preferred word. c. the words have different meaning. d. "rotation" is the correct word, and "revolution" should not be used.