A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
a. 13.4 s
b. 16.7 s
c. 12.5 s
d. 9.70 s
e. 6.03 s
b
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Free Fall: A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?
A. 4T B. 2T C. T D. T/2 E. T/4
In a series RLC circuit a capacitor will be dominant at lower frequencies
Indicate whether the statement is true or false
Which of the following planets can be in opposition?
a. Mercury b. Venus c. Earth d. Neptune
A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the change in frequency (in Hz) heard by an observer in the truck as the two vehicles pass each other? (The speed of sound in air is 343 m/s.)
a. 242 b. 238 c. 240 d. 236 e. 234