A sound changes from 25dB to 5 dB. How much louder does the 25 dB seem to us

The weight w (in pounds) of an object varies inversely with the square of the distance d (in miles) of the object from the center of Earth. At sea level (3978 miles from the center of Earth), an astronaut weighs 210 pounds.

What is the value of (8 104) 2, written with the correct mumber of significant figures? A) 206.324 B) 206.323 C) 2063 D) 206 E) 200

A ball hits a wall. What is true about the magnitude of the force experienced by the ball compared with the force experienced by the wall? OA. The ball experiences more force than the wall. OB. The ball experiences less force than the wall.

When does an object have negative velocity

The total momentum of a flock of identical birds could be zero only if the birds are? a) taking off from the ground. b) flying in the same direction. c) flying in different directions. d) very tired and coming down to rest

A change from one form of energy into another is called a. gravitational potential energy. b. work. c. conservation of energy. d. an energy transformation

4. An airplane must achieve a velocity of 71 m/s for takeoff. If the runway is 1000 m long, what must the acceleration be?

As the average kinetic energy of the particles in a gas increases, which of the following occurs?

Power=170 watts time=20 seconds

What is the charge of alpha, beta and gamma rays?