What is the definition of speed

4. A high school athlete runs 400 m in 52.20 sec. What is his speed in mph? 14100 1110

A statue is made of bronze, which is an alloy of about 80% copper and 20% tin. Which metal is in the higher concentration in this bronze statue? A. The concentrations of each metal in the statue are equal. B.

5000 j of heat are added to a system. it does 3500 j of work on the surroundings. what is δe in j?

At a busy intersection, a 1320-kg car traveling west with a speed of 12 m/s collides head-on with a minivan traveling east with a speed of 9.4 m/s. The cars stick together and move with a velocity of 1.5 m/s to the east after the collision.

A teacher listed the following two processes. • Process 1: water changing to ice in a refrigerator • Process 2: steam coming out of a kettle filled with hot of water Which table correctly identifies the change of state taking place in each example?

Why is flammability a chemical property?

Luke pulls a sled using a force of 65 N for a distance of 25 m across level ground. The rope Luke pulls forms an angle of 25° with the ground. About how much work does Luke do on the sled? 250 J 690 J 1,500 J 1,600 J

Intramolecular and intermolecular forces hold together which of the following? A. atoms within a molecule B. molecules within an object C. charged particles within a salt crystal D. the atoms within compounds E. all of the above

Why is it that a football does not stay in motion at a constant speed when thrown, as the First Law of Motion suggests that it would? 1) Air resistance and acceleration 2) Gravity and mass 3) Distance, mass and gravity 4) Air resistance and gravity

A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. approximately how much work does the student do against friction in moving the box 5.