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Sam is standing in an empty auditorium. He yells and hears his voice echo. What is happening to the sound to cause this echo?

A 1200 kg car moving at 7.8 m/s collides with a stationary car of mass 1500 kg. if the two vehicles lock together, what is their combined velocity immediately after the collision?

Resistance in a series circuit will

you toss an apple from a tree 5m horizontally. The Apple hits your friend on the ground that is 7m away from the tree. How fast did you throw the Apple in m/s? hello, answeerr

List five factors that may affect the rate of a chemical reaction

True or False: As the mass of an object increases, the gravitational pull increases

Sound travels 2146 m through a material in 1.4 seconds. What is the material?

The relationship between frequency and wavelength is a (n) relationship

Use g = 9.8 m/s2. From the top of a cliff, a person throws a stone straight downward. The initial speed of the stone just after leaving the person's hand is 9.7 m/s.

15 J of work were expended moving an 18 kg block. At what velocity did the block move? Provide step by step walkthrough

Define element and list two examples.