Which are the simplest pure substances that cannot be broken down into any other substances

A __ lens is sometimes called a converging lens because it ___.

A parent pulls a child in a wagon at a constant speed. If the parent pulls with a force of 16N for 12 m and the handle is inclined at 25 degrees above the horizontal how much work does the parent do on the wagon?

If a man weight 155 lb on earth, specify ( a. His mass in slugs, ( b. His mass in kilograms, and ( c. His weight in Newton's. If the man is on the moon, where the acceleration due to gravity is gm = 5.30 ft/s2, determine ( d.

A 2-kg bowling ball is 1 meter off the ground on a post when it falls. Just before it reaches the ground, it is traveling 4.4 m/s. Assuming that there is no air resistance, which statement is true? The mechanical energy is not conserved.

According to the graph, what is the maximum age at which a 4000 Hz sound wave with an intensity of 20 dB would be heard? 55 60 65 70

A rocket moves away from the surface of the earth. As the distance r from the center of the planet increases, what happens to the force of gravity on the rocket?

Why am i not floating?

A person holds onto an object for 2 minutes, but doesn't move the object. Is work done on the object?

Warming in front of a fire while camping is an example of? A. Conduction B. Convection C. Radiation

In which medium would light travel the fastest? Question 21 options: a. across a room b. in a swimming pool c. through outer space d. through a railroad track