A stranded tourist is pulled up by a helicopter. The tourist who weights 72 kg is pulled up with an acceleration of 3 m/s². What is the magntude of the tension in the cord? (Give the answer in Newtons -- numerical value only) Number The cord is made of a polymer material that has a Young's modulus 2.495 x 10° N/m². When unstretched, the cord is 12 m long with a diameter of 1.179 cm. What is the change in the length of the cord when lifting up the tourist? (Give the answer in cm -- numerical value only) Number

A stranded tourist is pulled up by a helicopter. The tourist who weights 72 kg is pulled up with an acceleration of 3 m/s². What is the magntude of the tension in the cord? (Give the answer in Newtons -- numerical value only) Number The cord is made of a polymer material that has a Young's modulus 2.495 x 10° N/m². When unstretched, the cord is 12 m long with a diameter of 1.179 cm. What is the change in the length of the cord when lifting up the tourist? (Give the answer in cm -- numerical value only) Number

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter14: Static Equilibrium, Elasticity, And Fracture

Section: Chapter Questions

Problem 54PQ

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Similar questions

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(a) The "lead" in pencils is a graphite composition with a Young's modulus of about 1109 N/ m2. Calculate the change in length of the lead in an automatic pencil if you tap it straight into the pencil with a force of 4.0 N. The lead is 0.50 mm in diameter and 60 mm long. (b) Is the answer reasonable? That is, does it seem to be consistent with what you have observed when using pencils?
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The lintel of prestressed reinforced concrete in Figure P12.27 is 1.50 m long. The concrete encloses one steel reinforcing rod with cross-sectional area 1.50 cm2. The rod joins two strong end plates. The cross-sectional area of the concrete perpendicular to the rod is 50.0 cm2. Youngs modulus for the concrete is 30.0 109 N/m2. After the concrete cures and the original tension T1 in the rod is released, the concrete is to be under compressive stress 8.00 106 N/m2. (a) By what distance will the rod compress the concrete when the original tension in the rod is released? (b) What is the new tension T2 in the rod? (c) The rod will then be how much longer than its unstressed length? (d) When the concrete was poured, the rod should have been stretched by what extension distance from its unstressed length? (e) Find the required original tension T1 in the rod. Figure P12.27