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 is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.)
a. 361
b. 636
c. 393
d. 396
e. 383
d
You might also like to view...
__________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus
a. Irregular b. S0 c. E7 d. Sa e. E0
The center of mass (or center of gravity) of a two-particle system is at the origin. One particle is located at (3.0 m, 0.0 m) and has a mass of 2.0 kg. The other particle has a mass of 3.0 kg. What is the location of the 3.0-kg particle?
A) (-3.0 m, 0.0 m) B) (-2.0 m, 0.0 m) C) (2.0 m, 0.0 m) D) (3.0 m, 0.0 m)
A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the angular acceleration of the fan?
A) 0.86 rad/s2 B) 0.74 rad/s2 C) 0.37 rad/s2 D) 11.6 rad/s2 E) 1.16 rad/s2
What type of geological activity is seen on Neptune's moon Triton?
a. Plate tectonics and earthquakes are a common occurrence on Triton. b. Volcanoes of molten lava, similar to Earth, have been seen there. c. Geysers of liquid nitrogen are seen erupting from its surface. d. Geysers of liquid water are seen erupting from its surface.