The H-R Diagram, an important tool of astronomers, relates stellar temperature to stellar
A) distance.
B) mass.
C) color.
D) density.
E) luminosity.
Answer: E
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A parachutist steps from a hovering helicopter and falls for 5 s before reaching terminal velocity. During this 5-s interval, her acceleration
A) is constant. B) increases. C) decreases. D) is zero. E) none of the above
Clouds have a profound effect on climate
What will be an ideal response?
Beats: A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0 m/s. The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s?
A. 5000 Hz B. 4500 Hz C. 8490 Hz D. 9000 Hz E. 4250 Hz
Fahrenheit and Kelvin scales agree numerically at a reading of:
A. -40 B. 0 C. 273 D. 301 E. 574