In sample Prob. 8.02, Which quantityremains unchanged if we choose differentreference frames?a. potential energy,Ub. change in potential energy, delta(U)c. origind. kinetic energy, KEe. velocity, v Sample Problem 8.02 Choosing reference level for gravitational potential energy, slothHere is an example with this lesson plan: Generally you canchoose any level to be the reference level, but once chosen,be consistent. A 2.0 kg sloth hangs 5.0 m above the ground(Fig. 8-6).the ground, (3) at the limb, and (4) 1.0 m above the limb?Take the gravitational potential energy to be zero at y = 0.KEY IDEA(a) What is the gravitational potential energy U of thesloth-Earth system if we take the reference point y = 0 to be(1) at the ground, (2) at a balcony floor that is 3.0 m aboveOnce we have chosen the reference point for y = 0, we cancalculate the gravitational potential energy U of the systemrelative to that reference point with Eq.8-9.Calculations: For choice (1) the sloth is at y = 5.0 m, andU = mgy = (2.0 kg)(9.8 m/s²)(5.0 m)= 98 J.(Answer)For the other choices, the values of U are(2) U= mgy = mg(2.0 m) = 39 J,(3) U = mgy = mg(0) = 0 J.(4) U= mgy = mg(-1.0 m)= -19.6 J = -20 J.10-2-3(Answer)(b) The sloth drops to the ground. For each choice of refer-ence point, what is the change AU in the potential energy ofthe sloth-Earth system due to the fall?KEY IDEAThe change in potential energy does not depend on thechoice of the reference point for y = 0; instead, it dependson the change in height Ay.-3-5-6Calculation: For all four situations, we have the same Ay =-5.0 m. Thus, for (1) to (4). Eq. 8-7 tells us that(1)(2)(3)(4)Figure 8-6 Four choices of reference point y = 0. Each y axis is markedin units of meters. The choice affects the value of the potential energyU of the sloth-Earth system. However, it does not affect the changeAU in potential energy of the system if the sloth moves by, say, fallingAU=mg Ay (2.0 kg)(9.8 m/s )(-5.0 m)-98 J.(Answer)

The potential energy = m×g×h where m is the mass g is the acceleration due to gravity h is the…

Answered: In sample Prob. 8.02, Which quantity…

In sample Prob. 8.02, Which quantity remains unchanged if we choose different reference frames? a. potential energy, U b. change in potential energy, delta(U) C. origin d. kinetic energy, KE

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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