List 3 cases in which potential energy becomes kinetic energy and three cases in which kinetic energy becomes potential energy.

1. An electric iron has a rating of 750W, 220V. Calculate: (a) current passing through it (b) Its resistance when in use 2. Two lamps, one rated 100W, 220V and other 40W, 220V are connected in parallel to 220V mains supply.

How does mass affect the final velocity an object attains as it falls?

What must occur for a process to be a chemical reaction? A. The process must involve a change in mass. B. The process must involve a change in volume. C. There must be more products than reactants. D.

The elevator of a large building is to raise a net mass of 400 kg at a constant speed of 12 m/s using an electric motor. minimum power rating of the motor should be

Why will a block of iron float in mercury but sink in water?

A farmer had 15 sheep, and all but 8 died. How many are left?

While playing with her 5 year old cousin, a Physics 135 student pushed him forward on his scooter. She pushes with a force of 50 Newtons for 3.5 seconds. If the boy and the scooter together have a mass of 30 kg, what is their final velocity? a. 2.

3. A 120.0 V generator supplies 3.0 kw of power. How much current ca the generator deliver?

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?