An acorn falls from an oak tree. You note that it takes 2.5 seconds to hit the ground. How fast

was it going when it hit the ground?

Unpolarized light with intensity I0I0I_0 is incident on an ideal polarizing filter. The emerging light strikes a second ideal polarizing filter whose axis is at 45.0 ∘∘ to that of the first.

A 0.80 kg basketball traveling upward at 5.0 m/s impacts an 8.0 10 kg tennis ball traveling downward at 5.0 m/s. The basketballâs velocity after the collision is 3.0 m/s upward. What is the velocity of the tennis ball after the collision?

What is an electric field? (choose all that are true) a) A vector field created by a charged particle. b) The field created when one charged particle is brought close to another charged particle. c) A scalar field created by a charged particle.

An opera singer breaks a crystal glass with her voice. Which best explains why this occurs?

One disadvantage of this type of power is that it still pollutes the air. biomass geothermal power hydropower solar power You want to create a new warming appliance that is safe.

Light, dry snow is called powder. Skiing on a powder day is different than skiing on a day when the snow is wet and heavy.

Light from the sun reaches the earth in 8.3 minutes. In how many minutes does the light from the sun reach venus

For a fixed amount of gas, if the absolute temperature of the gas is doubled, what happens to the pressure of the gas?

Which actions most likely cause the domains in a ferromagnetic material to align?

A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance?