A student throws a ball vertically upward so it just reaches the height of a window on the second floor of a dormitory. At the same time that the ball is thrown upward, a student at the window drops an identical ball. Are the mechanical energies of the balls the same at half the height of the window? Explain.
Answer to relevant QuestionsIf you check your electricity bill, you will note that you are paying the power company for so many kilowatt-hours (kWh). Are you really paying for power? Explain. If a spring is compressed 2.0 cm from its equilibrium position and then compressed an additional 2.0 cm, how much more work is done in the second compression than in the first? Explain. An eraser with a mass of 100 g sits on a book at rest. The eraser is initially 10.0 cm from any edge of the book. The book is suddenly yanked very hard and slides out from under the eraser. In doing so, it partially drags ...If a 10-N force is used to compress a spring with a spring constant of 4.0 x 102 N/m, what is the resulting spring compression? A 0.20-kg object with a horizontal speed of hits a wall and bounces directly back with only half the original speed. (a) What percentage of the object’s initial kinetic energy is lost: (1) 25%, (2) 50%, or (3) 75%? (b) ...
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