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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...

Answered by David T. • Physics tutor

3063 Views

Give an example of 3 different types of radiation stating their make up, penetration and ionising effect.

alpha - helium nucleus - least penetrating - most ionising

beta - electron or positron - second most penetrating - second most ionising

gamma - photon - most penetrating - least ionising

Answered by Mark S. • Physics tutor

1467 Views

Determine a vector expression for the position of a particle whose velocity is (3t^2 - 8)i + 5j m/s.

r(t) = [integral] v(t) dt

= (t^3 - 8t + C)i + (5t + C)j m

Answered by Matteo T. • Physics tutor

1626 Views

Find, using integration, the work done in compressing a spring by a distance x.

[integral from 0 to x']dW= [integral from 0 to x'] F(x') dx'

=[integral from 0 to x']kx' dx'

=1/2k

Answered by Matteo T. • Physics tutor

3121 Views

Please explain air resistance.

Both air and water are made up of lots of tiny particles. When you run your hand through water, there is some resistance to motion caused by the interaction between your hand and the water particles. In a...

Answered by Harris V. • Physics tutor

1818 Views