College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Chapter 5, Problem 33PE
(a) By how much does a 65.0-kg mountain climber stretch her 0.800-cm diameter nylon rope when she hangs 35.0 m below a rock outcropping? (b) Does the answer seem to be consistent with what you have observed for nylon ropes? Would it make sense if the rope were actually a bungee cord?
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(a) The “lead” in pencils is a graphite composition with a Young's modulus of about 1×109 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?
(a) The “lead” in pencils is a graphite composition with a Young’s modulus of about 1×109 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?
(a) The “lead” in pencils is a graphite composition with a Young’s modulus of about 1X10 N/m. 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?
Chapter 5 Solutions
College Physics
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- An aluminium (=2.7g/cm3) wire is suspended from the ceiling and hangs vertically. How long must the wire be before the stress at its upper end reaches the proportionality limit, which is 8.0107N/m2 ?arrow_forwardOne end of a light spring with spring constant k, is attached to the ceiling. A second light spring is attached to the lower end, with spring constant k,. An object of mass m is attached to the lower end of the second spring. (a) By how much does the pair of springs stretch? (Use the following as necessary: k,, k,, m, and g, the gravitational acceleration.) Xtotal = (b) What is the effective spring constant of the spring system? (Use the following as necessary: k,, k,, m, and g, the gravitational acceleration.) keff = (c) What If? Two identical light springs with spring constant k, are now individually hung vertically from the ceiling and attached at each end of a symmetric object, such as a rectangular block with uniform mass density. In this case, with the springs next to each other, we describe them as being in parallel. Find the effective spring constant of the pair of springs as a system in this situation in terms of k2. (Use the following as necessary: ka, M, the mass of the…arrow_forward)A strand of dragline silk is 6 µm about in diameter, about 10% the diameter of a human hair. What is the largest mass that can be supported by a wire of dragline silk and by a very fine copper wire of the same diameter? (Tensile strength of silk: 1000 × 106 N/m² and tensile strength of copper: 200 × 106 N/m²) 0000arrow_forward
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