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The total amount of energy in the universe never changes, but the availability of each different type of energy to do work can change tremendously. What best explains this change in available energy?(1 point)
The best explanation for the change in available energy is the concept of energy transformation. Energy can be converted from one form to another, such as from thermal energy to mechanical energy or from potential energy to kinetic energy. However, during each energy transformation, some energy is inevitably lost in the form of heat or other non-usable forms. This loss of available energy is known as the principle of increasing entropy, or the second law of thermodynamics. Thus, while the total amount of energy in the universe remains constant, the availability of each different type of energy to do work can change due to energy transformations and the dissipative nature of these processes.
the total amount of energy in the universe never changes, but the availability of each different type of energy to do work can change tremendously. What best explains this change in available energy?(1 point)
Responses
Energy is always converted with 100 percent efficiency.
Energy is always converted with 100 percent efficiency.
Energy can only be created through nuclear reactions.
Energy can only be created through nuclear reactions.
Energy is regularly changing from one form into another.
Energy is regularly changing from one form into another.
Energy can only be transferred as heat.
The correct response:
Energy is regularly changing from one form into another.
What is the energy transformation that occurs when a smoke alarm goes off?(1 point)
Responses
electrical to potential
electrical to potential
electrical to sound
electrical to sound
potential to electrical
potential to electrical
sound to light
The correct response:
electrical to sound
Hydroelectric dams work by blocking the path of a water source to create an area with water held back by the dam. The dam can then be opened to allow water to be released.. The energy from the moving water is used and transformed into electrical energy. What type of energy does a hydroelectric dam capture as the water passes through?(1 point)
Responses
Mechanical energy
Mechanical energy
Nuclear energy
Nuclear energy
Sound energy
Sound energy
Light energy
The correct response:
Mechanical energy
Question
You are cooking pasta and putting a pot of water on an electric stove. When the water starts to boil, you add the pasta. What energy transformation occurs to cook the pasta?(1 point)
Responses
heat energy to mechanical energy
heat energy to mechanical energy
nuclear energy to heat energy
nuclear energy to heat energy
mechanical energy to light energy
mechanical energy to light energy
electric energy to heat energy
The correct response:
electric energy to heat energy
You are making toast. You take two slices of bread and put them into the slots of a toaster. Then you plug in the toaster and press the button down. One minute later you hear two golden, crispy slices pop up. Which table correctly matches the action with the type of energy?(1 point)
Responses