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).
6.2 x 10⁷ N/m².
1.2 x 10⁸ N/m².
3.1 x 10⁷ N/m².
9.3 x 10⁷ N/m².
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?
8.0 x 10⁻⁷ m.
7.8 x 10⁻⁶ m.
3.1 x 10⁻⁵ m.
3.2 x 10⁻⁶ m.
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?
3.30 J.
3.60 J.
6.60 J.
3.55 J.
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).
0.11 mm.
0.89 mm.
0.22 mm.
0.33 mm.
