In air and in water the same sound travels with different
A) frequencies.
B) speeds.
C) both of these
D) neither of these
Answer: B
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The Sloan Digital Sky Survey uses:
A) a single space-based telescope. B) a single Earth-based telescope. C) an array of Earth-based telescopes. D) several widely distributed Earth-based telescopes. E) several space-based telescopes.
Jane drove her car from Columbus, Ohio to
Cleveland, Ohio. She traveled a total distance of 140 mi in 2.8 hours. Her average speed was a) 50 mi/h b) 0.02 mi/h c) 56 mi/h d) 350 mi/h
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 16 N b. 17 N c. 21 N d. 11 N e. 25 N
Intensity: About 1350 W/m2 of electromagnetic energy reaches the upper atmosphere of the earth from the sun, which is 1.5 × 1011 m away. Use this information to estimate the average power output of the sun.
A. 1 × 1026 W B. 2 × 1026 W C. 3 × 1026 W D. 4 × 1026 W