Question

A metal rod has a Young's modulus of 180 x 10^{9}
N/m^{2}, a coefficient of linear expansion of 11 x
10^{-6}/C^{o} and an ultimate strength of 440 x
10^{6} N/m^{2}. When it is at 25.0^{o}C it
is bolted at both ends and then cooled. At what temperature will it
rupture?

Answer #1

Experimental data:
Length L0 of the cold rod (measured with a meter stick): 600 +/-
1 mm
Cross-sectional diameter d of the rod (measured with a caliper):
6.1 +/- 0.1 mm
The change in length ∆L after the rod reached its final
temperature: 1.04 +/- 0.01 mm
The initial temperature of the rod (the room temperature): 22
+/- 1 ̊C
The final temperature of the rod shown by the thermometer: 93 +/- 1
̊C
Linear thermal expansion coefficient
calculation:
1)...

What is the change in length of a metal rod with an original
length of 4 m, a coefficient of thermal expansion of 0.00002/ ° C,
and a temperature change of 30° C?
1.
2.4 mm
2.
12 mm
3.
1.2 mm
4.
24 mm
Determine the number of electrons passing through a point in the
wire in 8 minutes when the current is 10 A.
a.
3 * 1016 electrons
b.
none of these
c.
4,800 electrons
d.
1.6...

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