An engineering student found that the Youngs modulus of an alloy was 2.8 x 10^11 Pa. The 1.5m wire of the allow increased in length by 0.24% during an experiment. Calculate the stress on the wire.
The Youngs modulus of a material is = Stress / Strain. Therefore, the stress of an object is the strain multiplied by the Youngs modulus. We know that strain is the change in length (or extension) divided by the original length. Which in this case, is (1.5 * 1.0024 )m / 1.5m - notice the units cancel. Multiplying this by 2.8x 10^11Pa (YM) will give us a stress of 6.7 x 10^8 Pa. Notes: 0.0024 is 0.24% written as a decimal, so an increase in 0.24% is 1.0024 multiplied by the original length.
DT
Related Physics A Level answers
All answers ▸What is meant by the doppler effect?
A block of mass (m) is placed on a rough slope inclined at an angle (a) to the horizontal, find an expression in terms of (a) for the smallest coefficient of friction (x), such that the block does not fall down the slope.
You have a layer of glass with a refractive index of 1.5 and the glass is surrounded by air. A light ray shines into the glass and Total Internal Reflection occurs at the glass-air boundary. What is the critical angle?
A ball is thrown at speed u = 10.0 m/s at an angle of 30.0 degrees to the ground at height, s = 0. How far does the ball travel horizontally from its starting position? (Ignore air resistance and taking g = 9.81 m/s^2)