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Chapter 9: Q19Q (page 230)

Materials such as ordinary concrete and stone are very weak under tension or shear. Would it be wise to use such a material for either of the supports of the cantilever shown in Fig. 9–9? If so, which one(s)? Explain

Short Answer

Expert verified

Concrete and stone can be used for the right-hand support of the cantilever.

Step by step solution

01

Understanding cantilever beam

In a cantilever beam, the left-hand support pulls the beam downward. So, the beam should be pulled in the upward direction on the support of the beam.

02

Explaining the use of concrete and stone for either of the supports on the beam

Stone and concrete are the types of materials that are weak under tension, and the left support of the cantilever beam undergoes greater tension. So, concrete and stone should not be used in the left support.

The right-hand support of the beam experiences compression force; so using concrete or stone can be appropriate.

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Most popular questions from this chapter

A woman is balancing on a high wire, which is tightly strung, as shown in Fig. 9–45. The tension in the wire is

(a) about half the woman’s weight.

(b) about twice the woman’s weight.

(c) about equal to the woman’s weight.

(d) much less than the woman’s weight.

(e) much more than the woman’s weight.


(II) Two cords support a chandelier in the manner shown in Fig. 9–4 except that the upper cord makes an angle of 45° with the ceiling. If the cords can sustain a force of 1660 N without breaking, what is the maximum chandelier weight that can be supported?

(II) If a compressive force of \({\bf{3}}{\bf{.3 \times 1}}{{\bf{0}}^{\bf{4}}}\;{\bf{N}}\) is exerted on the end of a 22 cm long bone of a cross-sectional area of \({\bf{3}}{\bf{.6}}\;{\bf{c}}{{\bf{m}}^{\bf{2}}}\), (a) will the bone break, and (b) if not, by how much does it shorten?

A 20.0-m-long uniform beam weighing 650 N rests on walls A and B, as shown in Fig. 9–62. (a) Find the maximum weight of a person who can walk to the extreme end D without tipping the beam. Find the forces that the walls A and B exert on the beam when the person is standing: (b) at D; (c) 2.0 m to the right of A.

A steel rod of radius\(R = 15\;{\rm{cm}}\)and length\({l_0}\)stands upright on a firm surface. A 65-kg man climbs atop the rod. (a) Determine the percent decrease in the rod’s length. (b) When a metal is compressed, each atom moves closer to its neighboring atom by exactly the same fractional amount. If iron atoms in steel are normally\(2.0 \times {10^{ - 10}}\;{\rm{m}}\)apart, by what distance did this interatomic spacing have to change in order to produce the normal force required to support the man? [Note: Neighboring atoms repel each other, and this repulsion accounts for the observed normal force.
See all solutions

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