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A74.0 kg person climbs stairs, gaining 3.50 meters in height. Find the work done (in J) to accomplish this task.

A74.0 kg person climbs stairs, gaining 3.50 meters in height. Find the work done (in J) to accomplish this task.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A74.0 kg person climbs stairs, gaining 3.50 meters in height. Find the work done (in J) to accomplish this task. Suppose a car travels 108 km at a speed of 40.0 m/s, and uses 1.90 gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 1.30 x 10 J per gallon.) (a) what is the force (in N) exerted to keep the car moving at constant speed? N (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s? gallons
Transcribed Image Text:A74.0 kg person climbs stairs, gaining 3.50 meters in height. Find the work done (in J) to accomplish this task. Suppose a car travels 108 km at a speed of 40.0 m/s, and uses 1.90 gallons of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is 1.30 x 10 J per gallon.) (a) what is the force (in N) exerted to keep the car moving at constant speed? N (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s? gallons
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