A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.8 m in a time of 4.0 s. The average speed of the ball is
A. 1.0 m/s.
B. 3.2 m/s.
C. 0.2 m/s.
D. 2.0 m/s.
Answer: C
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The model we have constructed in this chapter neglects feedback effects that might accelerate or brake the warming. It is possible that higher temperatures will yield increased evaporation and increased cloud cover. Will this accelerate or brake the warming compared to the predictions of the model in the text?
A. Accelerate B. Brake C. No change
A rifle is aimed horizontally toward the center of a target 0.10 km away, but the bullet strikes 10 cm below the center. Calculate the velocity of the bullet just as it emerges from the rifle
Why did Copernicus hesitate to consider alternatives to the Ptolemaic Universe? a. A heliocentric Universe contradicted Christian theology at the time
b. There was no way to prove uniform circular motion. c. New star formation showed no parallax. d. Most people already believed in a heliocentric Universe. e. His mathematics could not disprove Ptolemy's epicycles, deferents and equants.
Angular Momentum: A uniform, solid, cylindrical flywheel of radius 1.4 m and mass 15 kg rotates at 2.7 rad/s. What is the magnitude of the flywheel's angular momentum?
A. 40 kg ? m2/s B. 20 kg ? m2/s C. 80 kg ? m2/s D. 60 kg ? m2/s