6m 1. How much work is done: 3m 1. lifting a 100 N block of ice straight up a vertical distance of 3 m? (answer: 300 J) 2. pushing a 100 N block up a 6 m long ramp with a force of 50 N to the same height? (answer: 300 J) 3. How much potential energy did the block gain in each case listed above? Explain. 2. Using the work-energy theorem, when driving 90 km/hr, how much more distance do you need to stop compared with driving 30 km/hr? (answer: 9 times the distance) 3. Can an object have energy? Can an object have work? Explain. 4. Draw a Sankey diagram for and calculate the efficiency of the following light bulbs: 1. A 100 W incandescent bulb on for 1 minute, producing a total of 1200 J of light. (answer: 20%) 2. A 30 W florescent bulb on for 1 minute, producing a total of 1200 J of light. (answer: 67%) 3. A 25 W LED bulb on for 1 minute, producing a total of 1200 J of light. (answer: 80%) 5. The average solar cell has an efficiency of about 18%. If a solar cell is used to generated electricity that is then is transmitted 1000 ft (assume efficiency of transmission lines is 90%) to power a 100W light bulb. How much incoming solar energy is needed to keep the light on for 12 hours? (answer: 2.7 * 107 Joules)