A car is going past a radio station at a speed of 40.0 m/s. If the radio station broadcasts at a frequency of 74.5 MHz, what change in frequency does the driver observe?
A) 9.93 Hz
B) 99.3 Hz
C) 993 Hz
D) 7.45 Hz
E) 74.5 Hz
A
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When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
a. is independent of velocity or acceleration. b. increases when the velocity increases. c. is proportional to the acceleration. d. decreases when the force parallel to the floor increases. e. increases when the force parallel to the floor increases.
What is an artificial star?
A) a meteor B) the unseen member of a binary star system C) a satellite orbiting Earth D) a point of light in Earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations E) a possible source of dark matter in the universe
A woman walks briskly at 2.0 m/s how much wile will it take her to walk one mile?
A. 8.3 min B. 13.4 min C. 21.7 min D. 30.0 Min
A metal having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 4.0 eV. What is the maximum kinetic energy of the photoelectrons produced by this light? (h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J)
A) 2.6 × 10-19 J B) 3.8 × 10-19 J C) 4.7 × 10-19 J D) 5.5 × 10-19 J E) 6.4 × 10-19 J