A source emits sound at a fixed constant frequency f.If the source moves away from you faster than the speed of sound in air, you do not hear any frequency but instead a ‘sonic boom.'

a. True
b. False
Indicate whether the statement is true or false


True

Physics & Space Science

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Slanting Surfaces Without Friction: A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?

A. 200 N B. 120 N C. 160 N D. 150 N E. 0 N

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What is the magnitude of the magnetic force on a charged particle (Q = 5.0 ?C) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = ?4.0 T, and Bz = 3.0 T?

A. 2.8 N B. 1.6 N C. 1.2 N D. 2.0 N E. 0.4 N

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Neutrons are good "projectiles" for inducing nuclear reactions because they

a. have no electric charge. b. are themselves unstable. c. are highly energetic. d. have no mass.

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Internal human body temperature is often stated to be normal at 98.6°F. What is this temperature on the Kelvin scale?

A) 346 K B) 393 K C) 310 K D) 296 K E) 418 K

Physics & Space Science