<p> Thursday, 12/5 – Power & Energy Practice</p><p>1. Power is the ______at which ______is done. </p><p>2. The equation for power is ______. </p><p>3. The unit for power is the ______which also called the ______. </p><p>4. Does an increase in power mean more work is being done? Circle one: yes or no</p><p>5. Explain your answer from #4. ______.</p><p>6. A person performs 90 J of work lifting a package onto a shelf. It takes 5 seconds to lift the box from the floor. How much power did the person generate? </p><p>G: E: S:</p><p>U: S: </p><p>7. If person generates 100 watts of power while pushing a lawn motor 10 meters in 120 seconds, how much work was done?</p><p>G: E: S:</p><p>U: S: </p><p>8. Bart runs up a 2.91-meter high flight of stairs at a constant speed in 2.15 seconds. If Bart's mass is 65.9 kg, determine the work which he did and his power rating.</p><p>G: E: S:</p><p>U: S: </p><p>9. On a recent adventure trip, Anita Break went rock-climbing. Anita was able to steadily lift her 80.0- kg body 20.0 meters in 100 seconds. Determine Anita 's power rating during this portion of the climb.</p><p>G: E: S:</p><p>U: S: </p><p>PHYSICSFundamentals © 2004, GPB 6-12 Use the diagram above to answer questions 6 thru 10.</p><p>6. Calculate the total mechanical energy for the diagram above. a. 20,000 Joules b. 20,000 Watt c. 50,000 Joules d. 50,000 Watts</p><p>7. Calculate the kinetic energy for point C.</p><p> b. 20,000 Joules b. 30,000 Joules c. 35,000 Joules d. 50,000 Joules</p><p>8. Calculate the potential energy for point C.</p><p> c. 20,000 Joules b. 30,000 Joules c. 35,000 Joules d. 50,000 Joules</p><p>9. If the ski jumper from the diagram above was still moving when they reach point D what would their kinetic energy be?</p><p> d. 20,000 Joules b. 30,000 Joules c. 35,000 Joules d. 50,000 Joules</p><p>10. If the ski jumper from the diagram above was still moving when they reached point D what would their potential energy be?</p><p> e. 0 Joules b. 20,000 Joules c. 30,000 Joule d. 50,000 Joules</p><p>PHYSICSFundamentals © 2004, GPB 6-12</p>