A boy drops a ball from an observation tower. The ball hits the ground in 5.0 s. What is the ball's velocity at the time of impact?

A. 0 m/s

B. 98 m/s

C. 49 m/s

D. 123 m/s

Oxygen makes up the largest part of living cells at 65%. What is the percentage of the second-most abundant element in living cells?

Why are frying pans usually made out of metal?

A double-paned window has two glass panes separated by a layer of air. Why is air, rather than glass, used to fill this space?

Averaged over a year in the central United States, radiation from the Sun transfers about 200 W to each square meter of Earth's surface. If a house is 10 m long by 10 m wide, how much solar energy falls on the house each second.

Consider two conducting spheres with one having a larger radius than the other. Both spheres carry the same amount of excess charge.

During one year a population of blue jays has zero population growth. which must be true about the blue jay population at the end of the year compared to the beginning of the year?

Given the two sets, which statement is true? A = {1, 2} B = {1, 2, 3, 4}

The net force acting on an insect falling downward at constant velocity is

Which statement best compares the accelerations of two objects in free fall? O The heavier object has a greater acceleration.

A series RCL circuit includes a resistance of 280, an inductive reactance of 508, and a capacitive reactance of 315. The current in the circuit is 0.312 A.