A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren relative to the police car is 500 Hz, what is the frequency heard by an observer in the truck as the police car approaches the truck? (The speed of sound in air is 343 m/s.)
a. 396
b. 636
c. 361
d. 393
e. 617
b
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During his public school and university days, Einstein could best be described as
A) a child prodigy who attracted teachers' admiration. B) a nonconforming and daydreaming student. C) a good but not outstanding student. D) an excellent and hardworking student. E) a mediocre but hardworking student.
A 5.00 kg mass is located at (1.0 m, 0.00 m, 3.00 m), a 2.00 kg mass is located at (0.00 m, 3.00 m, – 2.00 m), and a 3.00 kg mass is located at (–1.0 m, –2.00 m , 0.00 m). The center of gravity of the system of masses is
A. (1/10m, 10/10m, 1/10m). B. (2/10m, 0m, 11/10m). C. (3/10m, 2/10m, 10/10m). D. (10/10m, 2/10m, 3/10m). E. (2/10m, 10/10m, 0m).
Which of these has the greatest mass?
A) proton B) electron C) both of these D) neither of these
The process of casting a sheet of plastic in a mold formed by two sheets of glass is called ___________casting.
Fill in the blank(s) with the appropriate word(s).