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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

3691 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

1847 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

2003 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

4037 Views

Why does magnetic field do no work on an electric charge?

There is a qualitative and a quantitative way to show that the magnetic field does no work on electric charges. The qualitative description requires a picture; essentially, one looks at the circular orbit...

Answered by Jergus S. • Physics tutor

2700 Views