How much heat energy is required to raise the temperature of 5 kilograms of coal from 20 celisus to 220 celsius?
a.) 6,573 j
b.)314 j
c.) 1,314,718 j
d.) 4,187,000 j

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

Ways that industry and agriculture use physical properties to separate substances

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m