Suppose you hear a car approaching and its horn is heard as a 3037. Hz tone. After passing, you hear 2430. Hz
(a) What was the Mach number of the car?
(b) What is the speed of sound if the outside temperature is 19.°C?
(c) How fast was the car moving, in meters per second?
(a) 0.111 (b) 342. m/s (c) 38.0 m/s
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Energy Conservation With Conservative Forces: If a spring-operated gun can shoot a pellet to a maximum height of 100 m on Earth, how high could the pellet rise if fired on the Moon, where g = 1.6 m/s2?
A. 17 m B. 160 m C. 3.6 km D. 100 m E. 610 m
A satellite, initially at rest in deep space, separates into two pieces, which move away from each other. One piece has a rest mass of 190 kg and moves away with a speed 0.280c,
and the second piece moves in the opposite direction with a speed 0.600c. What is the rest mass of the second piece? A) 88.7 kg B) 68.8 kg C) 79.6 kg D) 52.7 kg E) 73.9 kg
Energy Density: The energy density of an electromagnetic wave in free space is
A. entirely in the electric field. B. entirely in the magnetic field. C. 1/4 in the electric field and 3/4 in the magnetic field. D. 1/4 in the magnetic field and 3/4 in the electric field. E. equally divided between the magnetic and the electric fields.
A solid nonconducting sphere of radius R carries a charge Q distributed uniformly throughout its volume. At a certain distance r1 (r1 < R) from the center of the sphere, the electric field has magnitude E
If the same charge Q were distributed uniformly throughout a sphere of radius 2R, the magnitude of the electric field at the same distance r1 from the center would be equal to A) E/8. B) E/2. C) 2E. D) 8E. E) E.