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A wire has length l, cross-sectional area a, resistivity p and resistance R. It is compressed to a third of its original length but its volume and resistivity are constant. Show its new resistance is R/9.

First realize if its length is now l/3 but its volume is constant its cross sectional area is 3a. Substitute those into the equation for resistance R=p(l/a) and you get (1/9)(p(l/a))= R/9

TD
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Describe how the strong nuclear force between two nucleons varies the distance between the 2 nucleons.

The strong force between two nucleons is initially repulsive. However at a distance of around 1 fm the force crosses over and becomes repulsive. The strong nuclear force is only seen to act over short dis...

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7693 Views

Two cars start at point A. Car 1 moves in a direction at 5 m/s. After 10 seconds car 2 accelerates in the same direction as car 1 at 2m/s^2. At what time after car 1 starts moving and distance from A does car 2 pass car 1?

-First find an equation for the distance travel by car 1. In this case s=5t+50 -Next find an equation for the distance traveled by car 2. Using suvat since constant acceleration (1/2)at^2+ut=s. Substitute...

TD
4301 Views

What makes a good essay? (AQA spec)

A good essay will always have a good balance between outline, evaluation and (if there's a 'stem' in the question) application. You need to make sure that you outline the theory/treatment, but that you al...

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Answered by Sarah T. Psychology tutor
3248 Views

How would behaviourist psychologists treat phobias?

There are two common forms of treatments that are based on the conditioning explanations of phobias. If phobias are acquired through classical conditioning and maintained through operant conditioning, sys...

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Answered by Sarah T. Psychology tutor
7615 Views

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