need help with #5 please, thank you! 3. A copper wire, 1.00 m long has a diamete
ID: 779206 • Letter: N
Question
need help with #5 please, thank you!
3. A copper wire, 1.00 m long has a diameter of 0.750 mm. When an unknown weight is suspended from the wire it stretches 0.200 mm. What was the load (i.e, weight) placed on the wire? 4. A coil spring stretches 4.00 cm when a mass of 500 g is suspended from it. What is the force constant of the spring? 5. A brass cube, 5.00 cm on a side, is subjected to a tangential force. If the angle of shear is measured in radians to be 0.01 rad, what is the magnitude of the tangent (Sbrass-3.6 x 1010 Pa) al force? A cube of lead 15.0 cm on a side is subjected to a uniform pressure of 5.00 x 10* N/m2 By how much does the volume of the cubic change? ead7.7 x 109 Pa) 7. A pressure of 1.013 x 10 N/m2 is applied to a volume of a 15.0 m3 of water. If the bulk modulus of water is 0.020 x 1010 N/m2, by how much will the water be compressed? 8. A lead block of 50.0 cm long, 10.0 cm wide, and 10.0 cm thick, has a force of 200,000 N placed on it. Find the stress and the strain, and the change in length if (a) the block is standing upright, and (b) the block is lying flat. (Ylead-1.6 x 1010 Pa)Explanation / Answer
5.
Sbrass = F/(A theta)
Given that :
Sbrass = 3.6 x 1010
A = area = 0.05 x 0.05 = 25 x 10-4
theta = 0.01 rad
inserting the values in the formula
Sbrass = F/(A theta)
(3.6 x 1010) = F/((25 x 10-4) (0.01))
F = 9 x 105 N
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