Name Physies 111-01 General and Modern Physics Examination 2 (Take Home) March 2
ID: 2029507 • Letter: N
Question
Name Physies 111-01 General and Modern Physics Examination 2 (Take Home) March 21, 2018 Read each problem and question carefully. Problems must have work shown for credit. Exam is due by Friday March 23, 2018 at 3:00 PM in my office. A kilowatt-hour is a unit of a. workb.power I. c.potential difference d. kinetic energy 2. A baseball of mass 0.500 kg is thrown upward with an initial speed of 35 m/s. If air resistance is neglected, what is the force on the ball (a) when it reaches half its maximum height and (b) when it reaches its peak? 3. How much work is needed to lift a 5.00 kg backpack to a shelf 1.0 m above the floor? 4. A cheerleader lifts his 50.0 kg partner straight up off the ground a distance of 1.00 m before releasing her. She does a somersault and is caught at the point of release. He then returns her to her starting position. (a) What is her displacement for this maneuver? (b) How much work has he done? (c) If they do this stunt 10 times, what is the total amount of work that he has done? 5. State the Law of Conservation of Energy: 6. A car increases it velocity uniformly from 0 to 60 mi/h in 30 s. What is the average velocity, and how far did it travel in the 30 s?Explanation / Answer
1) kilowatt is unit of power and hour is unit of time.
so
kilowatt-hour = power x time = energy/work.
Unit of both energy and work is joule and kilowatt-hour is an equivalent of joule.
Thus there are two correct options.
Ans: (a) work and (d) kinetic energy
However, if only one option is acceptable, then the answer would be (a) work because it is more generalized.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.