When does work occur

Which one of these facts about light are true? A) Light rays cannot stop until a mass is able to receive the light ray. B) Light has a indefinite source.

Does the speedometer of a car read average speed or instantaneous speed?

Some animals hibernate durung parts of the year. which of the following explains why sime animals hibernate? A. most animals hibernate to avoid the summer's heat. B. animals hibernate as a defense against predators C.

Give reasons for the following: a. Knives and swords are supposed to have extremely thin blades. b. Lorries and trucks carrying heavy loads have 8 tires instead of four, and the tires are broader. c.

A periodic wave has a wavelength of 0.50 m and a speed of 20 m/s. What is the wave frequency?

You have a potential difference of 8 v. how much work is done to transfer 0.32 c of charge through it? answer in units of j.

Why is raw sewage a major pollutant in some countries but not in developed countries?

What is the momentum of a 2 kg ball traveling at 2m/s

A constant force is exerted for a short distance on a block of mass that is initially at rest on a horizontal frictionless plane. This force gives the block a certain final speed v.

A football quarterback is moving straight backward at a speed of 3.00 m/s when he throws a pass to a player 20.0 m straight downfield. (a) if the ball is thrown at an angle of 25.