### Class XI

A steel cable with a radius of 1.5 cm supports a chairlift at a ski area. If the maximum stress is not to exceed 108108 N m−2m−2 , what is the maximum load the cable can support?
1. 6.97××104104 N
2. 6.87××104104 N
3. 7.17××104104 N
4. 7.07××104104 N
A copper cube measures 6.00 cm on each side. The bottom face is held in place by very strong glue to a flat horizontal surface, while a horizontal force F is applied to the upper face parallel to one of the edges. How large must F be to cause the cube to deform by 0.250 mm? (shear modulus of copper = 4.4 ×× 10101010 Pa)
1. 6.6 ×× 105105 N
2. 6.4 ×× 105105 N
3. 6.3 ×× 105105 N
4. 6.5 ×× 105105 N
If the shear stress exceeds about 4.00 ×× 108108 N/ m2m2, steel ruptures. Determine the shearing force necessary to punch a 1.00-cm-diameter hole in a steel plate 0.500 cm thick
1. 6.08 ×× 104104 N
2. 6.18 ×× 104104 N
3. 5.98 ×× 104104 N
4. 6.28 ×× 104104N
Material is said to be ductile if
1. material cross section is not significantly reduced at failure
2. fracture occurs soon after the elastic limit is passed
3. material breaks suddenly at little elongation
4. a large amount of plastic deformation takes place between the elastic limit and the fracture point
The importance of the elastic behavior of materials is
1. that it enables a safe and sound design of bridges, buildings, machinery parts.
2. that it gives methods for understanding materials
3. that it is useful in making springs
4. that it is useful in building sling shots
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