What determines whether a current carries warm or cold water?

A 2.0-kg ball rolls to the right at 3.0 m/s. A 4.0-kg ball rolls to the left at 2.0 m/s. What is the momentum of the system after a head-on collision of the two balls?

Two charges separated by 1 m exert 1 N forces on each other. If the charges are pushed to 1/4m separation, the force on each charge will be

The Emerald Suite is a revolving restaurant at the top of the Space Needle in Seattle, Washington. If a customer sitting 18 m from the restaurant's center has a tangential speed of 2.54 * 10-2 m/s, what is the angular speed of the restaurant?

An exothermic reaction ___ energy. A) releases B) absorbs C) creates D) decreases

A geologist is studying a rock core sample of a hillside. Which would be the BEST evidence that this hillside was once covered by a body of water? A) The top of the core sample would contain fossils of shells.

Is the furnace an internal or external combustion engine

An airplanes flies 2220 miles in 3. What is it's average speed in miles per hour?

One bullet has twice the mass of the second bullet. if both are fired so that they have the same speed which had more kinetic energy?

An incident that is caused by sleep and also occurs during sleep is known as a

A person is strolling along a moving walkway at a constant velocity of + 1.00 m/s with respect tot he walkway, which moves at a constant velocity of + 0.50 m/s with respect to the ground.