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$\bullet$ (a) How many joules of energy does a 100 watt lightbulbuse every hour? (b) How fast would a 70 kg person have to runto have that amount of kinetic energy? Is it possible for a per-son to run that fast? (c) How high a tree would a 70 kg personhave to climb to increase his gravitational potential energy rela-tive to the ground by that amount? Are there any trees that tall?
a) $3.6 \times 10^{5} \mathrm{J}$b) 101 $\mathrm{m} / \mathrm{s}$ No, it is not possible to run at such a speed.c) 525 $\mathrm{m}$ No, there is not a tree that tall.
Physics 101 Mechanics
Chapter 7
Work and Energ
Physics Basics
Applying Newton's Laws
Kinetic Energy
Potential Energy
Energy Conservation
University of Michigan - Ann Arbor
Simon Fraser University
University of Sheffield
Lectures
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problem number 63 in this problem, it is given that in party 100. What? Lightbulb powered? Call 200 words. Light ball consumes electrical energy for one. Oh, So the energy consumed by the light? Well, can we calculated as e equals I would into dame, which is 100 words into one, uh, one. What is equal, Jules, but second and one, our physical. 2360 zero seconds. Thus, we good energy consumed by the bulb as three point six into turned to the power five Jews. This is the total amount off electrical energy consumed by the light bulb. One one, our friend. A power off the lightbulb is 100 watts. No, For the second part of the question, we have to for days speed off, running man for the amount off energy concluded in part, eh? When? A percent. Since he has, Can it take energy? Because we can, right, uh, into 70 which is most of the person we square is equal to 3.6 indu, tend to the power five. This is in jewels. This Will Lehto three equals one seed or one meters, but a second. This dispute is very high for a person to work in. So this is Bill is not possible in practical conditions. In the tired part of the question Oh, we have to calculate the height off a person when he claims, and a tense gravitational potential energy equal to the energy in part a. The gravitational potential energy attained can build it in this mm G, It's is equal to the total energy consumed in party, which is 3.6 into 10 to the power five is 70 in due nine point gate. One match is equal to 3.6 to tend to the power five. This will give us high because five Dole five meters and we know get enmity cannot have this much. Hi, little this.
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