9 kg of copper sits at temperature of 29 degrees F. how much heat is required to raise its temperature to 678 degrees f? the specific of copper is 385 j/kg C

Aplanet of mass m 6.75 x 1024 kg is orbiting in a circular path a star of mass m 2.75 x 1029 kg. the radius of the orbit is r 8.05 x107 km. what is the orbital period (in earth days) of the planet tplanet?

In a system, when potential energy decreases, then entropy also decreases. true false

Why don't you see your reflection in water with waves or repples