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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
MS
Answered by Mark S. • Physics tutor
2174 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
MT
Answered by Matteo T. • Physics tutor
2571 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/ 2 k x^2 It is a 1-D problem so line integral do not need to be used. At a given instant, let the amount by ...
MT
Answered by Matteo T. • Physics tutor
4690 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 si...
HV
Answered by Harris V. • Physics tutor
2660 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 orbits o...
JS
Answered by Jergus S. • Physics tutor
3585 Views