A quantity that is a measure of how the displacement of a body changes with time is:

velocity

speed

momentum

charge

acceleration

Which device converts kinetic energy into electrical energy? an electric generator an electric motor a step-down transformer a step-up transformer

Light with a wavelength of 600 nm is incident on a gemstone made of cubic zirconia (ᡦ = 2.18) from air. The light makes an angle of 30° with the surface of the gem before entering it. The refracted ray makes an angle of 30° with the normal.

The process by which you group things based on their similarities is known as classifying. a. True b. False

If the sound of an electric can opener causes a cat to salivate because it has been associated with the presentation of food, the cat's salivation to the sound of the can opener is

What is the cause of atmospheric pressure? The weight of the air minus the buoyancy of the air Solar energy The weight of the air minus the upward sucking force due to the vacuum of space The weight of the air

A swimmer jumps from a waterfall thats is 8.5 m high from the lake below. How fast must he run horizontally to dive 2.5m away from the base of the waterfall?

What happens (as far as energy goes) when a molecule of gas strikes the wall of a container?

The boom of a fire truck raises a fireman (and his equipment - total weight 280 lbf) 60 ft into the air to fight a building fire.

Two masses are separated by 1 m. suppose the masses are moved so they are 2 m apart how will the gravitational force change

Bob rubs a piece of fur on a hand rubber rod, giving the rod a negative charge. what happens?