Chapter 4: Q28P (page 166)
A certain spring has stiffness. The spring is then cut into two equal lengths. What is the stiffness of one of these half-length springs?
Short Answer
The value of stiffness is.
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Chapter 4: Q28P (page 166)
A certain spring has stiffness. The spring is then cut into two equal lengths. What is the stiffness of one of these half-length springs?
The value of stiffness is.
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You hang a heavy ball with a mass of 14 kg from a gold wire 2.5 m long that is 2 mm in diameter. You measure the stretch of the wire, and find that the wire stretched 0.00139 m. (a) Calculate Young’s modulus for the wire. (b) The atomic mass of gold is 197 g/mole, and the density of gold is. Calculate the interatomic spring stiffness for gold.
Steel is very stiff, and Young’s modulus for steel is unusually large, . A cube of steel 28 cm on a side supports a load of 85 kg that has the same horizontal cross section as the steel cube. (a) What is the magnitude of the normal force that the steel cube exerts on the load? (b) What is the compression of the steel cube? That is, what is the small change in height of the steel cube due to the load it supports? Give your answer as a positive number. The compression of a wide, stiff support can be extremely small.
Question:A certain metal with atomic mass 2 × 10−25 kg has an interatomic bond with length 2.1 × 10−10 m and stiffness 40 N/m. What is the speed of sound in a rod made of this metal?
: Two wires with equal lengths are made of pure copper. The diameter of wire A is twice the diameter of wire B. When 6kg masses are hung on the wires, wire B stretches more than wire A. You make careful measurements and compute young’s modulus for both wires. What do you find? (a) , b) c)
Uranium-238 ( ) has three more neutrons than uranium-235 ( ). Compared to the speed of sound in a bar of , is the speed of sound in a bar of higher, lower, or the same? Explain your choice, including justification for assumptions you make.
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