On Earth, on which day do you expect the length of daytime to be roughly equal to the length of nighttime?
A) February 21
B) December 21
C) January 21
D) June 21
E) March 21
Ans: E) March 21
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A heater is rated at 1200 watts for a 120-volt source.The resistance of the heater is 10 ohms
a. True b. False Indicate whether the statement is true or false
A 30-?F capacitor is charged to 40 V and then connected across an initially uncharged 20-?F capacitor. What is the final potential difference across the 30-?F capacitor?
A. 15 V B. 24 V C. 18 V D. 21 V E. 40 V
Why does a sonic boom irritate people on the ground below a supersonic aircraft and not passengers inside the aircraft?
What will be an ideal response?
When a sky diver exits an airplane his
A. acceleration is at a maximum. B. velocity is at a maximum. C. acceleration remains constant. D. acceleration is at a minimum.