A 0.85N weight hangs on a spring of spring constant 42N/m. If the original length of the spring was 7cm then what is the new length of the spring? Give the new length in cm

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

Which one of the following research methods can show cause and effect

Positrons are spontaneously emitted from the nuclei of