# HW Ch7 - HW Ch 7 Work Energy and Power Chapter 7 Work...

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HW Ch. 7 Work, Energy and Power Chapter 7: Work, Energy and Power Conceptual problems 7.C.2 (5.00) There are two slides at the park between which you are deciding. Both start at a height of 6 m. One is short and steep while the other is long and shallow. If both slides are frictionless, which one should you choose if you want to be moving as fast as possible at the bottom? Short and steep Long and shallow It doesn't matter (0/1 submissions used) 7.C.4 (5.00) At the gym, your trainer places a 8.0 kg dumbbell in each of your outstreched hands. You hold them there for 20 seconds. Have you done any work during those 20 seconds? Yes No (0/1 submissions used) Section 0: Introduction 7.0.1 (5.00) Use the simulation in the interactive problem in Section 7.0 to answer the following questions. (a) If you release the car at a higher point, will its speed at the bottom of the hill be greater, the same, or less? (b) How high will you have to drag the car to have it just reach the summit of the other hill: to the same height, higher or lower? (a) GreaterThe sameLess (0/1 submissions used) (b) Higher than the other hillTo the same height as the other hillLower than the other hill (0/1 submissions used)

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Section 1: Work 7.1.2 (5.00) A parent pushes a baby stroller from home to daycare along a level road with a force of 44 N directed at an angle of 30° below the horizontal. If daycare is 0.83 km from home, how much work is done by the parent? (0/6 submissions used) J Section 2: Dot product 7.2.1 (5.00) Vector v has a magnitude of 56 m and vector u has a magnitude of 77 m. The angle between v and u is 150°. What is v · u ? (0/6 submissions used)
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HW Ch7 - HW Ch 7 Work Energy and Power Chapter 7 Work...

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