COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 9, Problem 63QAP
To determine
The minimum radius of wire.
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For the hinged beam and cable in example 9-6, what would happen to the tension in the cable
as the angle was increased? Would the tension increase, decrease or stay the same? Show
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1.)When two wires of identical dimensions are used to hang 25 kg weights, wire A is observed to stretch twice as much as wire B. From this observation, you can make the following conclusions about the Young’s moduli of these wires:
a.) YA = 4YB
b.) YA = 2YB
c.) YA = YB
d.) YA = YB
Orb Spiders make silk with a typical diameter of 0.15mm.
1)A typical orb spider has a mass of 0.50 g. If the spider suspended so from a single 12 cm long strand of self, by how much will the self stretch?
2)What is the maximum weight that a single strand of silk and support?
3)why do you have to lean forward when standing from a chair?
Chapter 9 Solutions
COLLEGE PHYSICS
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- A steel cable 2.00 m in length and with cross-sectional radius 0.350 mm is used to suspend from the ceiling a 10.0-kg model aircraft that is flying in a horizontal circle with an angular speed of 6.00 rad/s. What is the strain produced in the cable?arrow_forwardA brass wire and a steel wire, both of the same length, are extended by 1.0 mm under the same force. Is the cross-sectional radius of the brass wire more, less, or equal to the cross-sectional radius of the steel wire? Explain. Youngs moduli for brass and steel are 1.0 1010 N/m2 and 2.0 1011 N/m2, respectively.arrow_forwardAssume Youngs modulus for bone is 1.50 1010 N/m2. The bone breaks if stress greater than 1.50 108 N/m2 is imposed on it. (a) What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 2.50 cm? (b) If this much force is applied compressively, by how much does the 25.0-cm-long bone shorten?arrow_forward
- What happens when the stress applied to the body is increased beyond the maximum value and is removed after some time? A The body will come back to its original position B The body will oppose the stress C) Nothing will happen to the body D The body cannot return to its original positionarrow_forwardFlying Circus of Physics The figure shows an approximate plot of stress versus strain for a spider-web thread, out to the point of breaking at a strain of 2.20. The vertical axis scale is set by a = 0.190 GN/m²,b = 0.300 GN/m², and c = 0.720 GN/m². Assume that the thread has an initial length of 0.720 cm, an initial cross-sectional area of 4.00 x 10-12 m², and (during stretching) a constant volume. The strain on the thread is the ratio of the change in the thread's length to that initial length, and the stress on the thread is the ratio of the collision force to that initial cross-sectional area. Assume also that when the single thread snares a flying insect, the insect's kinetic energy is transferred to the stretching of the thread. (a) How much kinetic energy would put the thread on the verge of breaking? What is the kinetic energy of (b) a fruit fly of mass 7.50 mg and speed 2.00 m/s and (c) a bumble bee of mass 0.370 g and speed 0.800 m/s? Would (d) the fruit fly and (e) the bumble…arrow_forwardQUESTION 14 A force stretches a wire by 4.0 mm. A third wire of the same material has the same length and twice the diameter as the first. How far will it be stretched by the same force? 4.0 mm 16 mm 1.0 mm 2.0 mm 8.0 mmarrow_forward
- 7-25. Determine the internal normal force, shear force, and the moment at points C and D. A 2 m 2 kN/m 6 m 45° B D 3 m 3 m - Prob. 7-25arrow_forwardA steel wire of diameter 4.72 mm stretches by 7.98 mm when a 320 -kg piece of equipment is suspended from it. If the wire had a diameter of 4.75 mm instead, by what distance in mm would the equipment stretch the wire?arrow_forward7- Question 7. The following true stress-strain curve for a carbon nanofiber/epoxy with CaCO3 nanoparticles embedded in the matrix is represented in the figure bellow. Calculate the followings: a) K and n of stress-strain equation o=K ɛ". b) modulus of elasticity. c) toughness. 700 600 500 400 300 200 100 0.5 1 1.5 2 2.5 3 3.5 4 Strain % Stress (MPa)arrow_forward
- The elastic limit of an alloy is 7.0 x 10% N/m?. What is the minimum radius rmin of a 4.0 m long wire made from the alloy if a single strand is designed to support a commercial sign that has a weight of 8000 N and hangs from a fixed point? To stay within safety codes, the wire cannot stretch more than 5.0 cm. Imin = 0.0213 Incorrectarrow_forward+4* ) A timber beam consists of three 50 x 200-mm planks fas Ltened together to form an I-beam 200 mm wide x 300 m deep, as shown in Fig. P7-4. If the flexural stress at point Ad the cross section is 7.5 MPa (T), determine a. The flexural stress at point B of the cross'section b. The flexural stress at point C of the cross section. c. The flexural stress at point D of the cross section. 200 mm A 50 mm 100 mm 200 mm В ND 50 mm 25 mm Figure P7-4arrow_forwardA wire is stretched to its breaking point by a 5000 N force. A longer wire made of the same material has the same diameter. Is the force that will stretch it right to its breaking point larger than, smaller than, or equal to 5000 N? Explain.arrow_forward
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