Why does an object accelerate when it falls towards Earth's surface

A wave is traveling from one medium to another. If the wave is partially transmitted an partially reflected from the boundary, what will happen to the amplitude of the reflected wave?

2) If the centripetal force on an object in uniform circular motion is increased, what is the effect on (a) the frequency of rotation f (with r constant) and (b) f and r when both are free to vary

Circuit A in a house has a voltage of 208 V and is limited by a 40.0-A circuit breaker. Circuit B is at 120.0 V and has a 20.0-A circuit breaker. What is the ratio of the maximum power delivered by circuit A to that delivered by circuit B

What is the recommended daily dosage of flouride for a child over three years of age living in an area where drinking water is free fluoride

A motorboat and a pwc are meeting head-on. which one is the stand-on vessel?

A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C.

A spring (k = 790 N/m) has a length of 48 cm when zero net force is applied to it. What will its length be when 230 N of force is applied to stretch it? Question 3 options: 3.4 m 0.77 m 3.9 m 0.29 m

Inert gas used to make bright city lights True or False

A boulder on top of a cliff has a potential energy of 12400J. How high above is the boulder?

If the graph represents speed what is measured on the x and y axes