A child drops a ball from a window. The ball strikes the ground in 3 seconds. What is the velocity of the ball the instant before it hits the ground?

A cup of hot coffee can be cooled by placing a cold spoon in it. A spoon of which of the following materials would be most effective for this purpose: aluminum, copper, iron, or glass? Assume all spoons have the same mass.

Which appliances uses the larger current, a toaster or a desk lamp?

Historically, use of fossil fuels has lead to all of the following except: increased exchange of culture and ideas development of faster transportation methods increased availability of products including heat, plastics and medicine increased use of

Which features do sound waves have the ocean and light waves do not

Convert 4.565mm to m

What instrument is used routinely to check a person's exposure to radiation?

describe the relationship that exists between amplitude of a wave and the amount of energy that the wave carries

Recognize the relationship between stiffness of the medium and the speed of a wave.

Which of the following describes density only in terms of metric units? a. kilograms per cubic meter b. pounds per square meter c. pounds per cubic foot d. grams per cubic foot

A child drops a ball from a window. The ball strikes the ground in 3 seconds. What is the velocity of the ball the instant before it hits the ground?