if it takes a tennis ball falls straight down for 4 seconds from the top of a roof, how high above the ground is the roof?

Which of the following is not an indication of a chemical reaction? a substance dissolves formation of a precipitate color change the container gets cold

suppose you supply energy to a machine at a rate of 700 w and that the machine converts 560 j into heat every second. At what rate does the machine do work

Select the true statements: check all that apply check all that apply oxidizing agents can convert co into co2. a reducing agent gets oxidized as it reacts. if something is reduced, it is formally losing electrons.

What would happen to the average kinetic energy of the molecules of a gas sample if the. temperature of the sample increased from 20°c to 40°c?

The magnitude of the force that a spring exerts (F) when it is stretched a distance x from its unstressed length is governed by Hooke's law, F = kx.

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely

A spring is used in a lab. It is vibrated at different frequencies and the wavelength is recorded. Using the graph of the data, what is the relationship found between frequency and wavelength? A) Frequency and wavelength are inversely related.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?

What causes the stars to appear to move across the night sky?

Two waves collide and the temporary combined waves that results is smaller that the original wave. which term describes this interaction? A. destructive interference B. standing wave formation C. diffraction D. constructive interference