Asurface receiving sound is moved from its original position to a position three times farther away from the source of the sound. the intensity of the received sound thus becomes
a. three times as low.
b. nine times as high.
c. nine times as low.
d. three times as high.

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.