A 2400 kg elevator rises from rest in the basement to the fifth floor, a distance of 20 m As it passes the fith floor, its speed is 2.987 ms There is a constant frictional force of 420 N.Report answers for (b) to (e) in 4 significant figures. (a) What is the initial kinetic energy of the elevator? KEmital = (b) What is the potential energy of the elevator at fifth floor? PE = kJ KJ (c) What is the kinetic energy of the elevator at fifth floor? KE= (d) What is the work done by the frictional force? W,= KJ (e) How much work is gone by the lifting mechanism of the elevator? W=
A 2400 kg elevator rises from rest in the basement to the fifth floor, a distance of 20 m As it passes the fith floor, its speed is 2.987 ms There is a constant frictional force of 420 N.Report answers for (b) to (e) in 4 significant figures. (a) What is the initial kinetic energy of the elevator? KEmital = (b) What is the potential energy of the elevator at fifth floor? PE = kJ KJ (c) What is the kinetic energy of the elevator at fifth floor? KE= (d) What is the work done by the frictional force? W,= KJ (e) How much work is gone by the lifting mechanism of the elevator? W=
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Transcribed Image Text:A 2400 kg elevator rises from rest in the basement to the finti floor, a distance of 20 m As it passes the fith floor, its speed is2.987 ms
There is a constant frictional force of 420 N.Report answers for (b) to (e) in 4 significant figures,
(a) What is the initial kinetic energy of the elevator? KEnitial =
(b) What is the potential energy of the elevator at fifth floor? PE =
kJ
(c) What is the kinetic energy of the elevator at fifth floor? KE =
KJ
(d) What is the work done by the trictional force? W, =
kJ
(e) How much work is gone by the lifting mecthanism of the elevator? W=
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