An element's atomic number is 50. how many protons would an atom of this element have?

He density of copper is 8.96g/cm^3 and the density of water is 1 g/cm^3. When a copper is submerged in a cylindrical beaker whose bottom has surface area 10 cm^2 the water level rises by 2 cm.

When an object is not in motion, it can still have a form of energy. what form of energy does an object have due to its distance from earth? kinetic energythermal energygravitational potential energyelectrical potential energy?

When compared to other types of waves, electromagnetic waves differ because they are Select one: A. a form of energy. B. able to travel through a vacuum. C. all visible. D. able to move particles in a medium.

A red ball, initially at rest, is simultaneously hit by a blue ball traveling from west to east at 5 m/s and a green ball traveling east to west at 5 m/s. All three balls have equal mass.

As a star gets bigger what happens to the magnitude?

Why does ice generally have very little friction when it is in contact with other materials?

A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the speed of the car?

Discuss the changes in potential energy and kinetic energy and total energy for skateboarder going up and down on a half pipe ramp

The diagram below shows rock is affected when water enters cracks in rock, freezes and becomes ice

A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston.