Which statements describe ways in which heat can be generated?

by rubbing two sticks together, enough heat can be generated to start a camp fire.
1) heat energy is generated by ice when it is melting.
2) heat can be created when tires roll on paved highway roads on a long road trip.
3) gravity generates heat by pulling solar energy toward earth's surface.
4) water creates heat energy when it condenses to form clouds.
5) burning broken tree limbs and other yard scraps creates heat energy.

Each neuron shown in this figure innervates a group of muscle fibers. what is the term for a group of muscle fibers innervated by a single neuron?

What you see with your eyes is a form of energy. a. light b. heat c. chemical d. electrical

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.