Solution to Problem 574 | Horizontal Shearing Stress
Problem 574
In the beam section shown in Fig. P-574, prove that the maximum horizontal shearing stress occurs at layers h/8 above or below the NA.
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Solution to Problem 573 | Horizontal Shearing Stress
Problem 573
The cross-section of a beam is an isosceles triangle with vertex uppermost, of altitude h and base b. If V is the vertical shear, show that the maximum shearing stress is 3V / bh located at the midpoint of the altitude.
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Solution to Problem 572 | Horizontal Shearing Stress
Problem 572
The T section shown in Fig. P-572 is the cross-section of a beam formed by joining two rectangular pieces of wood together. The beam is subjected to a maximum shearing force of 60 kN. Show that the NA is 34 mm from the top and the INA = 10.57 × 106 mm4. Using these values, determine the shearing stress (a) at the neutral axis and (b) at the junction between the two pieces of wood.
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Solution to Problem 571 | Horizontal Shearing Stress
Problem 571
For a beam with the same cross section as that in Prob. 570, plot the shearing stress distribution across the section at a section where the shearing force is V = 1800 lb.
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Solution to Problem 570 | Horizontal Shearing Stress
Problem 570
A uniformly distributed load of 200 lb/ft is carried on a simply supported beam span. If the cross-section is as shown in Fig. P-570, determine the maximum length of the beam if the shearing stress is limited to 80 psi. Assume the load acts over the entire length of the beam.
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72 - 74 Light intensity of illumination and theory of attraction
Problem 72
A light is to be placed above the center of a circular area of radius a. What height gives the best illumination on a circular walk surrounding the area? (When light from a point source strikes a surface obliquely, the intensity of illumination is
where θ is the angle of incidence and d the distance from the source.)
Solution:
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69 - 71 Shortest and most economical path of motorboat
Problem 69
A man on an island 12 miles south of a straight beach wishes to reach a point on shore 20 miles east. If a motorboat, making 20 miles per hour, can be hired at the rate of $2.00 per hour for the time it is actually used, and the cost of land transportation is $0.06 per mile, how much must he pay for the trip?
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66 - 68 Maxima and minima: Pyramid inscribed in a sphere and Indian tepee
Problem 66
Find the largest right pyramid with a square base that can be inscribed in a sphere of radius a.
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64 - 65 Maxima and minima: cone inscribed in a sphere and cone circumscribed about a sphere
Problem 64
A sphere is cut to the shape of a circular cone. How much of the material can be saved? (See Problem 63)
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62 - 63 Maxima and minima: cylinder inscribed in a cone and cone inscribed in a sphere
Problem 62
Inscribe a circular cylinder of maximum convex surface area in a given circular cone.
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