A factory siren indicating the end of a shift has a frequency of 90.0 Hz
(a) What frequency is perceived by the occupant of a car traveling towards the factory at 25 m/s?
(b) What frequency is perceived by the occupant of a car traveling away from the factory at 30 m/s?
(a) 97 Hz
(b) 73 Hz
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Based on current scientific evidence, what is the likelihood that life on Earth was transported to Earth in meteorites?
A) impossible B) very likely C) certain D) possible
Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore, ________
A) both stars have the same luminosity, but the apparent brightness of Star A is four times that of B) both stars have the same luminosity, but the apparent brightness of Star B is four times that of C) both stars have the same apparent brightness, but the luminosity of Star B is four times that of D) both stars have the same luminosity, but the apparent brightness of Star B is twice that of Star A
Observers in different inertial frames can disagree about the time separating two events
Indicate whether the statement is true or false
What power is produced by a light bulb that yields 12 mW on a 15 cm x 25 cm sheet of paper that is normal to the line directly toward the bulb, if the paper is 1.7 m from the bulb?
A. 2.9 W B. 12 W C. 1.7 W D. 6.6 W