
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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How dependent on energy is our society? Why?
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- If a 80kg person walks up a 20m of stairs in 20s, what is their power? How much energy would they expend in 5s?arrow_forwardIf you expended 1500 watts for 3 hours, how many kilowatt-hours (kWh) would that be? Enter answer as number followed by a space and then the correct units (i.e "123 Unit").arrow_forwardA toaster has a power rating of 732 watts. If it takes 1.1 minutes to toast a slice of bread, how many joules of energy are required? Round your answer to the nearest whole number. The energy required would be Joules.arrow_forward
- Do all forces do work? Is all work done by a force? When you push on a wall, are you doing work? Are you expending energy?arrow_forwardYou lift a 2N rock by 4 m, in 2 seconds. How much work did you do? 8 J 6 J O 12 J O 16 Jarrow_forwardA 150-pound hiker walks at 3 mph up a 5% slope. This incline is a ratio of the vertical distance and horizontal distance expressed as a percentage (for example, the vertical distance increases by 5 feet for every 100 feet horizontally). What metabolic power is needed for this hike? (Hint: Model her power as a sum of the power needed to walk on level ground and the power needed to raise her body the appropriate amount).arrow_forward
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