7. What units would one use to measure the power output of a portable power generator? a. joules b. watts c. watts per hour d. kilowatt-hours
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- Which of the following is NOT an energy unit? (choose one best) a. watt x sec b. watts c. joules d. N x mQ2/ Fill the spaces 1- Kinetic energy of mass m whose speed v is 2- is energy transferred to or from an object by means of a force acting on the object. 3- Physics is based on measurement of , 4- A linear resistance has a value of ohms. 5- The of a material is the mass per unit volume.30. Which term refers to the energy of a mass by virtue of its motion? a. Potential Energy b. Mechanical Energy c. Kinetic Energy d. Solar Energy
- 17. Sketch this energy position graph. Label where the 5 spots (A to E) could be Energy vs Position Energy (J) Q 2500 1250 O -1250 -2500 Position (m) A. He is going his maximum speed B. He is stopped C. He is going his average speed D. He is going slow E. He is going fast PE KE1. Which order of magnitude does the SI prefix “mega-“ (M) represent? A. 103 B. 106 C. 109 D. 1012 2. 2.34 kW is equal to A. 2 340 W. B. 23 400 W. C. 234 000 W. D. 2 340 000 W. 3. How many seconds (s) are there in 1 hour 20 minutes? A. 80 s B. 380 s C. 4800 s D. 87 600 s 4. It takes a kettle 5 minutes to transfer 540 kJ of energy to boil some water. What is the power of the kettle? A. 1080 W B. 1800 W C. 9000 W D. 108 000 W 5. A heater of power 1200 W is switched on for an hour and a half. How much heat is given out from the heater? A. 2.16 kJ B. 6.48 kJ C. 2.16 MJ D. 6.48 MJ 6. An immersion heater has a power of 1500 W. How long does it take to supply 3 000 000 J of heat? A. 2 minutes B. 5 minutes C. 20 minutes D. 33 minutes 7. An immersion heater is connected to power supply via a joulemeter. The figure below shows the variation of the reading of the joulemeter with time. Estimate the power of the immersion heater. A. 582 W B. 723…Solar panels are planned to be installed directly under a power cable (cable diameter 14 mm). What is the optimal distance between the power cable and solar panel? Select one: a. 2.5 m. b. 1.5 m. c. 3.0 m. d. 2.0 m. e. 1.0 m.
- Q1. Explain the conservation of energy in terms of the energy transformation(s) that occur when you strike (light) a match. Q2. When you turn on a lamp at home you are using electricity generated by a power company or public utility. Assume the electricity powering the lamp was generated at a coal burning power plant and explain the conservation of energy in terms of the energy transformations that occur when you turn on the lamp.Hybrid vehicles are powered by a gasoline engine paired with an electric motor and batteries. Hybrids get much better mileage in the stop and go of city driving than conventional vehicles do. When you brake to a stop in a conventional car, friction converts the kinetic energy of the car’s motion into thermal energy in the brakes. In a typical hybrid car, depressing the brake pedal will connect a generator that converts much of the car’s kinetic energyinto chemical energy in a battery. Explain how this makes a hybrid vehicle more efficient.