A flow of electricity that constantly reverses direction. In the United States it reverses itself 120 times per second.

How can a global dependence on fossil fuels have associated social costs?

Is healthcare a right or a luxury?

A car was traveling due east at a constant speed of 60 miles per hour. How far did it travel in 10 min.

A metal pot feels hot to the touch, but the plastic handle does not. Which type of material is the plastic handle? A. A thermal insulator, because it transfers heat easily B. A thermal conductor, because it does not transfer heat easily C.

What happens to a sample of water when it is heated between 4°C and 100°C?

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)