A 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. It suddenly collides directly with a stationary seal of mass 200 kg
The seal grabs onto the whale and holds fast. What is the momentum of these two sea creatures just after their collision? You can neglect any drag effects of the water during the collision.
A) 0.00 kg ? m/s
B) 1200 kg ? m/s
C) 2000 kg ? m/s
D) 7200 kg ? m/s
E) 6000 kg ? m/s
E
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If a sound level increases by 20 dB, the intensity increases by a factor of _______.
a. one thousand b. one hundred c. ten d. ten thousand
A runner runs 10 m from the origin toward the WEST to point A. He then runs from point A 20 m more toward the WEST to point B. He then runs from point B 30 m more toward the EAST to point C. The runner's total displacement from the origin to point C is
A. 60 m toward the WEST. B. 50 m toward the EAST. C. 20 m toward the WEST. D. 10 m toward the EAST. E. 0 m.
Two light beams of different frequency but the same intensity fall on a black (totally absorbing) surface, striking perpendicular to the surface. Which of the following statements are true? (There could be more than one correct choice.)
A) The light beams exert no pressure on the surface because light is just energy. B) Both beams exert the same pressure on the surface. C) Painting the surface white would not affect the pressure on it due to these beams. D) If the surface were painted white (totally reflecting), the pressure on it would be less than when it was black. E) The high-frequency beam exerts more pressure on the surface.
The dimensionless dielectric _________is the magnitude of the polarization of the dielectric material divided by the surface-charge density of a vacuum capacitor.
Fill in the blank(s) with the appropriate word(s).