Q # 1 A metal wire of diameter D stretches by 0.100mm when supporting a weight W
ID: 1697686 • Letter: Q
Question
Q # 1
A metal wire of diameter D stretches by 0.100mm when supporting a weight W. if the same length wire is used to support a weight W. if the same length wire is used to support a weight three times as heavy, what would its diameter have to be (in terms of D) so it still stretches only 0.100mm? Marks = 7
Q # 2
If a metal wire has its length doubled and its diameter tripled, by what factor does its Young ‘modulus change? Marks = 7
Q # 3
If a uniform spring is cut in half, what is the force constant of each half? Justify your answer. How would the frequency of SHM using a half-spring differ from the frequency using the same mass and the entire energy? Marks = 6
Explanation / Answer
The net force on the light is
2Tsin45 = W
2 T *0.707 = W
T = W/1.414 is the tension in the cable
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