A ball thrown vertically upwards with an initial speed of 30m/s from the top of a cliff falls into the water 10seconds later directly below the cliff. Find

1. How high the ball went above the cliff

2. How high the cliff is, neglecting air resistance

What happened from the mid 1700s to the mid 1800s that contributed to the change in the global human population?

What is 9414 divided by 18

A 70 kg boy is sitting 3 m from the ground in a tree. What is his potential energy?

If the water in the bathtub has a higher temperature than the air in the bathroom, which will occur? No heat exchange will take place. Heat will flow from the water into the air. Cold will flow from the air into the water.

What is a small particle of an atom carries a neutral charge?

The period of a simple pendulum is 3.8 s. the length of the pendulum is doubled. what is the period t of the longer pendulum? t = s

True or false - sound waves can travel across outer space.

In which one of the following locations can a person hear the echo of a sound? a. At least 33.2 meters behind the reflecting surface b. Less than 16.6 meters in front of the reflecting surface c. Less than 33.2 meters behind the reflecting surface d.

F an electron fell to a lower orbit or energy level, energy would be A. created. B. emitted. C. absorbed. D. transferred.

Which is the correct order from the closest to the sun to the farthest away from the sun? A. terrestrial planets, asteroid belt, gas planets, Kuiper belt B. gas planets, asteroid belt, terrestrial planets, Kuiper belt C.