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In terms of particles, explain how resistance arises in metal conductors and why does this resistance increases with temperature.

Resistance is due to the collision of free electrons with the metal ions of the conductor. When the temperture increases, the metal ions have more energy and vibrate. This increases the frequency of collisio...
RR
Answered by Rhys R. • Physics tutor
14172 Views

A roller coaster has a loop, r = 20m, how fast should it travel so that riders don't fall out?

For the riders to not fall out two forces acting on them must be equal, those forces being the gravity pulling them down towards Earth's surface and the centripetal force acting away from the centre of rotat...
RW
Answered by Rebecca W. • Physics tutor
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A car moves from rest and accelerates uniformly at 4m/s/s, how far will it have traveled after 10 seconds?

d=ut+0.5at 2 so d=200m
KB
Answered by Katie B. • Physics tutor
2769 Views

What is the function of the control rods in the entire fission reactor proccess?

Fuel rods provide fissionable elements such as uranium - 235 , The uranium abosrbs a neutron at thermal speeds ( energy transefered to the moderator) from previous reactions. This then enables the Uranium to...
CS
Answered by Charles S. • Physics tutor
5861 Views

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...
DT
Answered by David T. • Physics tutor
4236 Views