The universe’s total amount of energy does not ever change, but the amount of this energy that is available to do work varies tremendously. What statement best explains the changes in available energy?(1 point)
Responses
A. The only way to create energy is through nuclear reactions.
B. Energy constantly changes from one form to another.
C. Energy transfer always occurs through heat.
D. 100% of energy is always converted with perfect efficiency.
B. Energy constantly changes from one form to another.
When a match is struck, what forms of energy does the burning match give off?(1 point)
Responses
A. Light energy and thermal energy
B. Nuclear energy and light energy
C. Thermal energy and solar energy
D. Solar energy and nuclear energy
A. Light energy and thermal energy
When a match is struck, what forms of energy does the burning match give off?(1 point)
Responses
A. Light energy and thermal energy
B. Nuclear energy and light energy
C. Thermal energy and solar energy
D. Solar energy and nuclear energy
A. Light energy and thermal energy
When an electric fan is plugged into a wall outlet, the fan blades spin as a result. What energy transformation occurred?(1 point)
Responses
A. Electrical to mechanical
B. Mechanical energy is created, but electrical energy is destroyed.
C. Electrical energy is created, but mechanical energy is destroyed.
D. Mechanical to electrical
A. Electrical to mechanical
A simple circuit is wired with a battery, a switch, and a bell.
When the switch is turned on, what energy transformations will occur?
(1 point)
Responses
A. The battery’s chemical energy transforms to sound energy, which the wire transfers to the bell.
B. The switch’s electrical energy transforms to sound energy, which the wire transfers to the bell.
C. The switch transforms electrical energy to chemical energy, which the bell then transforms to sound energy.
D. The battery’s chemical energy transforms to electrical
B. The switch's electrical energy transforms to sound energy, which the wire transfers to the bell.
A woman runs as shown.
What main energy conversion occurs?
(1 point)
Responses
A. Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.
B. Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner.
C. Thermal energy changes into mechanical energy because heat provides energy for motion.
D. Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.