How much heat is required to raise the temperature of a 50. 6 g copper metal cube from 25. 0 oc to 78. 0oc? (specific heat of cu = 0. 385 j/g oc).

A6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400kg moving at -3.0m/s. what is their final velocity? +0.50 m/s -1.0 m/s +2.5 m/s -0.25 m/s

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

What equation is used to calculate the weight of an object on a plant ?