A three-cell flashlight has 3 batteries in series each with an emf of 1.5 V. If the bulb has a resistance of 50 
what current is flowing when the flashlight is operating? (Assume the internal resistance of the batteries is negligible.)
A. 30 mA
B. 10 mA
C. 27 mA
D. 90 mA
E. 11 A
D. 90 mA
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Red light has a lower energy per photon than blue light. Therefore, red light has
A) higher frequency, shorter wavelength than blue light. B) lower frequency, longer wavelength than blue light. C) lower frequency, shorter wavelength than blue light. D) higher frequency, longer wavelength than blue light.
The short lifetime of muons created in the upper atmosphere of the Earth would not allow them to reach the surface of the Earth unless their lifetime increased by time dilation. From the reference system of the muons, the muons can reach the surface of the Earth because
a. time dilation increases their velocity. b. time dilation increases their energy. c. length contraction decreases the distance to the Earth. d. the relativistic speed of the Earth toward them is added to their velocity.
Jerome pitches a baseball of mass 0.300 kg. The ball arrives at home plate with a speed of 40.0 m/s and is batted straight back to Jerome with a return speed of 52.0 m/s. What is the magnitude of change in the ball's momentum?
a. 3.60 kg/m/s b. 12.0 kg/m/s c. 15.6 kg/m/s d. 27.6 kg/m/s e. 12.0 kg/m/s
A wave with a long wavelength has a relatively
A) low frequency. B) high frequency. C) both of these D) neither