A heavy rope, 60 ft long, weighs 0.5 Ib/ft and hangs over the edge of a building 130 ft high. (Let x be the distance in feet below the top of the building. Enter x,* as x.) (a) How much work W is done in pulling the rope to the top of the building? Show how to approximate the required work by a Riemann sum. lim n Express the work as an integral. dx Evaluate the integral. ft-lb (b) How much work W is done in pulling half the rope to the top of the building? Show how to approximate the required work by a Riemann sum. Ax lim n |- 1 Express the work as an integral. dx Evaluate the integral. ft-lb

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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A heavy rope, 60 ft long, weighs 0.5 Ib/ft and hangs over the edge of a building 130 ft high. (Let x be the distance in feet below the top of the building. Enter x,* as x;.)
(a) How much work W is done in pulling the rope to the top of the building?
Show how to approximate the required work by a Riemann sum.
Dax
lim
i = 1
Express the work as an integral.
dx
Evaluate the integral.
ft-lb
(b) How much work W is done in pulling half the rope to the top of the building?
Show how to approximate the required work by a Riemann sum.
lim
Ax
i = 1
Express the work as an integral.
dx
Evaluate the integral.
ft-lb
Transcribed Image Text:A heavy rope, 60 ft long, weighs 0.5 Ib/ft and hangs over the edge of a building 130 ft high. (Let x be the distance in feet below the top of the building. Enter x,* as x;.) (a) How much work W is done in pulling the rope to the top of the building? Show how to approximate the required work by a Riemann sum. Dax lim i = 1 Express the work as an integral. dx Evaluate the integral. ft-lb (b) How much work W is done in pulling half the rope to the top of the building? Show how to approximate the required work by a Riemann sum. lim Ax i = 1 Express the work as an integral. dx Evaluate the integral. ft-lb
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