A block with a mass 2.5kg slides with a velocity of 3 m/s on a frictionless surface. It hits a spring with a spring constant of 10 N/m. How much is the spring compressed

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather

What happens when the number of protons in an atom changes