Find the potential energy of a 2 kg ball 15 m in the air.

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Which branches of natural science include the study of an organism that lived 10 million years ago

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?