Q)
(chatquestion)...Questions and Problems
A 200-kg load is hung on a wire having a length of 4.00 m, cross-sectional area0.2 x
10-10 N
10- m2, and Young's modulus8.0 x
m2
What is its increase in length?
A sieel wire of diameter 1 mm can support a tension of 0.2 kN. A cable to support a tension
of 20 kN should have diameter of what order of magnitude?
3. A 30.0-kg hammer strikes a steel spike 2.30 cm in diameter while moving with speed 20 0
m/s. The hammer rebounds with speed 10.0 m/s after0.110 s. What is the average strain in
the spike during the impact?
4. If the shear stress in steel exceeds4.0 x 10°N/m2, the steel ruptures. Determine the shearing
force necessary to (a) shear a steel bolt 1.00 cm in diameter and (b) punch a 1.00-cm-
diameter hole in a steel plate 0.500 cm thick.
5. Lead has a greater density than iron, and both are denser than water. Is the buoyant force on a
lead object greater than, less than, or equal to the buoyant force on an iron object of the same
volume?
6. When an object is immersed in a liquid at rest, why is the net force on the object in the
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