An ambulance with its siren on is heading due east along a straight road at 60 mph. A car is also moving along the same road. In which case will the driver of the car perceive the frequency of the siren to be lowest?
a. The car is moving east at 65 mph and is behind the ambulance
b. The car is moving west at 65 mph and is behind the ambulance.
c. The car is moving east at 65 mph and is in front of the ambulance.
d. The car is moving west at 65 mph and is in front of the ambulance.
b
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The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes a 20° angle with the ground. The normal force of the level ground on the first box is NL; the normal force of the ramp on the second box is NR. Which statement is correct?
a. NR = NL = mg. b. NL = mg; NR = mg sin 20°. c. NL = mg; NR = mg cos 20°. d. NL = mg; NR = -mg cos 20°. e. NR = -NL = -mg.
A starship is constructed to be 100 m long in the factory. It is launched and as it coasts by Earth, it is measured to be shortened to 5.48 m long
(a) How fast, in terms of the speed of light, is it moving past Earth? (b) What length does the ship's crew measure for the ship?
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half life of the radioisotope is __________
Fill in the blank(s) with correct word
Which of the following is not a fundamental component of the atom?
a. proton b. neutron c. ion d. electron