A horizontal force of 300 N is applied to move a 55 kg sofa across a 10 m level surface. What is the net work done by this 300 N force?

a. 0 J

b. 550 J

c. 3000 J

d. 16500 J

Because of increasing evidence of damage to the ozone layer, chlorofluorocarbon (CFC) production was banned in 1996. However, there are about 100 million auto air conditioners that still use CFC-12 (CF2Cl2).

Which of the following materials is an insulator against electric current? A. A silver spoon B. Aluminum foil C. A copper penny D. A glass pane

A red opaque object A. absorbs all colors of the visible spectrum equally. B. reflects red light only. C. absorbs red light only. D. reflects all colors of the visible spectrum but red.

A surface 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 high. b. three times as low. c. nine times as high.

What term refers to the average kinetic energy of the particles from a just baked cookie

What is the gravitational force excerted on an object called?

What two variables is acceleration dependent on? What is the relationship between these variables and acceleration? (i. E. If you increase one variable what happens to the acceleration?)

1 A plane moving at 30m/s drops a load 200m down to the ground. How long did it take to hit the ground.

What causes lightining?

On an amusement park ride, riders stand inside a cylinder of radius 7.0 m. At first the cylinder rotates horizontally. Then after the cylinder has acquired sufficient speed, it tilts into a vertical plane, as shown in the diagram.