Consider a rigid body that is rotating. Which of the following is an accurate statement?
A) Its center of rotation must be at rest, i.e., not moving.
B) Its center of rotation must be moving with a constant velocity.
C) All points on the body are moving with the same angular velocity.
D) Its center of rotation is its center of gravity.
E) All points on the body are moving with the same linear velocity.
C
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Measured ages of globular clusters suggests that the Universe is about
a. 1.4 billion years old. b. 14 billion years old. c. 140 billion years old.
Two charges lie on the x axis, +2q at the origin, and ?3q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
a. 1.0 m. b. 2.0 m. c. 2.5 m. d. 3.0 m. e. 4.0 m.
Determine the heat capacity (in calories/°C) of a lake containing one million gallons (approximately 4 million kilograms) of water at 15°C
a. 4 × 10^6 b. 4 × 10^9 c. 4 × 10^3 d. 1 × 10^3 e. 4 × 10^2
The mass of a black hole can be determined by ________.
A. measuring its volume and density B. applying the modified version of Kepler's Third law, if the black hole is in a binary system C. the electromagnetic radiation it emits D. how rapidly it is spinning