Energy Transformations Quiz

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Presentation transcript:

Energy Transformations Quiz

1. A 5 kg box is at the top of a 2. 7 m tall incline 1. A 5 kg box is at the top of a 2.7 m tall incline. It slides to the bottom of the incline, reaching a speed of 7.3 m/s. What type of potential energy does the box have at the top of the incline?

Can this happen in real life? Explain. 2. A 5 kg box is at the top of a 2.7 m tall incline. It slides to the bottom of the incline, reaching a speed of 7.3 m/s. The potential energy at the top of the ramp is 133 J. When the box is allowed to slide down, the kinetic energy of the box at the bottom of the ramp is also 133 J. Can this happen in real life? Explain.

3. As water flows through a dam, it can be used to create electrical energy. The electrical energy is formed from the water’s stored Electrical energy Heat energy Gravitational potential energy Chemical energy

4. At a hydroelectric dam, the engineer calculates that there are 7,291,346 J of gravitational PE available in the stored water. A technician measures the electrical output energy at 2,861,039 J. Which statement is best supported by this evidence? Useful energy is lost within the energy transformations in the dam. The power plant is very inefficient and should be abandoned. The power plant changes mechanical to electrical energy and transmits it to people.

(Remember to label – no naked numbers!) 5. The gasoline in a car’s gas tank contains 1,350,000 J of chemical potential energy. The car’s engine converts this to 450,000 J of kinetic energy as the car travels down the road. How much energy is apparently lost? (Remember to label – no naked numbers!)