What characteristic of sound determines the "pitch" of a musical note?
A) amplitude
B) wavelength
C) frequency
D) phase
E) intensity
C
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A circus diver drops from a high pole into water far below. When he is half-way down
A) his potential energy is halved. B) he has gained an amount of kinetic energy equal to half his initial potential energy. C) his kinetic and potential energies are equal. D) all of the above E) none of the above
In this photo, water drops produce disturbances that move outward in circular patterns. What moves outward as drops hit the water's surface? (Hint: If a cork were floating on the water's surface, what would be its motion?)
a. The water at the surface. b. The energy of neighboring water molecules. c. Both a. and b.
A baseball is thrown and lands 120 m away. While the ball is in flight, assuming the effect of air friction is negligible, which of the following is true?
a. At maximum height the ball has its greatest kinetic energy. b. The horizontal component of the baseball's kinetic energy is constant. c. The vertical component of the baseball's kinetic energy is constant. d. The mechanical energy of the baseball is greater when nearer to the ground. e. No answer above is correct.
True or False: If you were traveling in a spaceship at a speed of c/2 relative to Earth and you fired a laser beam in the direction of the spaceship’s motion, the light from the laser would travel at a speed of 3c/2 relative to Earth
1.False 2.True