A satellite completes one full orbit around Earth. The work performed by Earth's gravitational force on the satellite is
A) always positive.
B) zero J.
C) always negative.
D) positive most of the time.
E) negative most of the time.
B
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Which of the following would not be considered evidence for dark matter in clusters of galaxies?
A) the total amount of stars B) the temperature of the intergalactic gas C) the velocities and radii of galaxy orbits around the center of mass in the cluster D) the curvature of gravitationally-lensed galaxies
The larger a turkey cooked in a conventional oven at a given temperature, the
A) more time per pound is needed. B) less time per pound is needed. C) the same time per pound is needed.
The period of an oscillating weight on a spring in an inertial frame of reference is 2.5 s. What would be its speed if it were to move by an observer who measures its period as 3.4 s? (c = 3.00 × 10^8 m/s)
a. 1.5 × l08 m/s b. 2.0 × 10^8 m/s c. 2.8 × l08 m/s d. 6.8 × 10^7 m/s e. 1.3 × 10^8 m/s
A sample of matter that contains atoms that all have the same number of protons is
a. an element. b. a substance. c. a compound. d. a homogeneous mixture.