. Lashonte was studying mechanical energy in science class. She noticed several possible examples of mechanical energy in her environment. Which of the following is NOT an example of mechanical energy?
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1 point
a garden hose with moving water
music playing on your phone
a windmill moving in the wind
a lamp giving off light
The correct answer is "a lamp giving off light." Light is a form of electromagnetic energy, not mechanical energy.
2. Kyra and Violet are camping with their family. They are roasting marshmallows over a campfire. What types of energy are released by the camp fire?
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1 point
mechanical energy and magnetic energy
heat energy and light energy
nuclear energy and electrical energy
chemical energy and sound energy
The correct answer is "heat energy and light energy." When wood burns in a campfire, the chemical energy in the wood is converted into heat and light energy.
When energy is conserved or transferred, some energy becomes unavailable to do useful work. What happened to the unavailable energy?
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1 point
It is conducted.
It is completely destroyed.
It is given off as heat.
It is given off as microwaves.
The correct answer is "It is given off as heat." When energy is conserved or transferred, some of it is converted into heat energy, which is typically unable to do useful work.
4. An electric fan is plugged into an outlet and the circuit completed, making the fan blades spin. Which of the following correctly describes this situation?
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1 point
Electrical energy is transformed into mechanical energy.
Mechanical energy is transformed into electrical energy.
Mechanical energy is destroyed, and electrical energy is created.
Electrical energy is destroyed, and mechanical energy is created.
The correct answer is "Electrical energy is transformed into mechanical energy." When the electric fan is plugged into an outlet and the circuit is completed, electrical energy is supplied to the fan, which is then converted into mechanical energy to make the fan blades spin.
hat is the main type of energy conversion taking place?
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1 point
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Thermal energy is converted to mechanical energy as the energy from heat provides energy for movement.
Mechanical energy is converted to thermal energy as the energy from movement creates heat in the surrounding air.
Chemical energy is converted to mechanical energy as the energy from digested food provides energy for movement.
Mechanical energy is converted to chemical energy as the movement from movement creates reactions in the surrounding air.
The correct answer is "Chemical energy is converted to mechanical energy as the energy from digested food provides energy for movement."
To determine which of the following is NOT an example of mechanical energy, we need to understand what mechanical energy is. Mechanical energy refers to the energy possessed by an object due to its motion or position. It can be categorized into two forms: kinetic energy (energy of motion) and potential energy (energy of position).
Now, let's analyze each of the given options:
1. A garden hose with moving water: This is an example of mechanical energy because the moving water within the hose possesses both kinetic energy (due to its motion) and potential energy (due to its position and the force of gravity acting on it).
2. Music playing on your phone: This is not an example of mechanical energy. Music playing on your phone involves the conversion of electrical energy into sound energy, but it does not involve any direct mechanical motion or position-related energy.
3. A windmill moving in the wind: This is an example of mechanical energy. The windmill's rotation, driven by the wind, possesses kinetic energy due to its motion, making it an example of mechanical energy.
4. A lamp giving off light: This is not an example of mechanical energy. The light emitted by the lamp originates from the conversion of electrical energy into light energy, but it does not involve any mechanical motion or position-related energy.
Therefore, the answer is: Music playing on your phone is NOT an example of mechanical energy.