As shown in the figure, a man is traveling on a bicycle along a straight road that runs parallel to and right next to some railroad tracks. While moving at 10 m/s, he hears the whistle of a train that is behind him, as shown in the figure
The frequency emitted by the train's whistle is but the frequency the man hears is The speed of sound is 340 m/s.
(a) What frequency is heard by a stationary observer located between the train and the bicycle?
(b) What is the speed of the train, and is the train traveling away from or toward the bicycle?
a) 797 Hz b) 9.8 m/s, away from the bicycle
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A) natural gas B) coal C) oil--i.e., petroleum D) nuclear
Which one of the following is responsible for the "one-way" nature of time, i.e., for the distinction between past and future?
A) the law of inertia B) the law of conservation of energy C) the second law of thermodynamics D) the gravitational force E) the electromagnetic force
How many electrons can be found with principal quantum number n=3 in a suitably heavy atom?
A) 9 B) 6 C) 20 D) 18
The size of a neutron star is
a. about the same as that of our Solar System. b. about the same as that of the Sun. c. about the same as Earth. d. smaller than any of these.