A steel lift column in a service station is 4.0 m long and 0.20 m in diameter. Young's modulus for steel is 20 x 1010 N/m².
By how much does the column shrink when a 5000-kg truck is on it?
7.8 x 10⁻⁶ m.
8.0 x 10⁻⁷ m.
3.1 x 10⁻⁵ m.
3.2 x 10⁻⁶ m.
An aluminum wire 2.0 m in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the stress in the wire?
(The Young's modulus for aluminum is 7.0 x 1010 N/m²).
9.3 x 10⁷ N/m².
6.2 x 10⁷ N/m².
1.2 x 10⁸ N/m².
3.1 x 10⁷ N/m².
A cable is 100-m long and has a cross-sectional area of 1 mm². A 1000-N force is applied to stretch the cable.
The elastic modulus for the cable is 1.0 x 1011 N/m². How far does it stretch?
0.10 m
0.01 m.
10 m.
1.0 m.
An aluminum wire 2.0 m in length and 2.0 mm in diameter supports a 10.0-kg mass. What is the elongation of the wire?
(The Young's modulus for an aluminum is 7.0 x 1010 N/m²).
0.22 mm.
0.89 mm.
0.11 mm.
0.33 mm.
The graph shows the behaviour of a sample of a metal when it is stretched until it starts to undergo plastic deformation. What is the estimated work done in stretching the sample from zero extension to 12.0 mm?
6.60 J.
3.55 J.
3.30 J.
3.60 J.
