Assessment 3 Directions: Choose the best answer from the choices in the parenthesis. Write your answer on a separate sheet of paper. 1. Electricity is produced in the (motor, generator). 2. Electric bike, where electric current is supplied to the machine as a result of a movement, is an example of (motor, generator) 3. The generator transforms mechanical into (radiant, electrical) energy, whereas electric motor does the opposite. 4. Both motor and generator have stator and (commutator, winding poles). 5. The motor converts electrical energy into (mechanical, chemical) energy, whereas generator does the opposite.

Integrated Concepts Large meteors sometimes strike the Earth, converting most of their kinetic energy into thermal energy. (a) What is the kinetic energy of a 109kg meteor moving at 25.0km/s ? (b) If this meteor lands in a deep ocean and 80% of its kinetic energy goes into heating water, how many kilograms of water could it raise by 5.0C ? (c) Discuss how the energy of the meteor is more likely to be deposited in the ocean and the likely effects of that energy.

For each of the following systems and time intervals, write the appropriate version of Equation 8.2, the conservation of energy equation. (a) the heating coils in your toaster during the first five seconds after you turn the toaster on (b) your automobile from just before you fill it with gasoline until you pull away from the gas station at speed (c) your body while you sit quietly and eat a peanut butter and jelly sandwich for lunch (d) your home during live minutes of a sunny afternoon while the temperature in the home remains fixed

Scientists and engineers must interpret problems from various sources. We can practice this skill anytime we read a newspaper or magazine or browse the Internet. Consider the Rocket Car urban legend that can be found on many Internet sites, in which the Arizona Highway Patrol allegedly found the vaporized wreckage of an automobile. The story goes that after some analysis and investigation, it was believed that a former Air Force Sergeant attached solid-fuel rockets to his 1967 Chevy Impala and ignited the rockets approximately 3.9 miles from the crash site. The vehicle quickly reached a speed of approximately 275 mph. It continued at this speed for 20 to 25 seconds. The car remained on the highway for 2.6 miles before the driver applied the brakes. The brakes melted and the tires blew out, causing the vehicle to become airborne. It traveled through the air for 1.3 miles before it hit a cliff face 125 feet above the road. Of course, this story was debunked. It is physically implausible, but it can still provide an opportunity to practice analyzing a problem. a. C Draw a Sketch of the Situation. b. C For the constant-velocity part of the cars motion, identify initial and final positions, the velocity, and the time interval. c. N Calculate the displacement using the position data and then again using the velocity and time data. Are your results consistent? d. C If your results are not consistent, reread the legend and identify possible sources of the discrepancy.