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Physics
A Level

Describe and explain how a constant rate of fission is maintained in a reactor by considering what events or sequence of events may happen to the released neutrons. (6 marks)

In one fission reaction 2 or 3 neutrons are released at once, to ensure the effectiveness and the safety of the reaction this must be controlled. A neutron is first slowed down by a moderator, which is us...

Answered by Laura L. Physics tutor
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A 80kg man is hanging from two 1.5m ropes that lie at 60 degrees from the horizontal. What is the tension in each rope required to prevent the man from dropping?

The man is 80kg so the downward force exerted by his weight is 80g (where g is the force of gravity equalling 9.8 Newtons (2dp)). Therefore the upward force exerted by each rope must equal 40g. Using tri...

Answered by Dominic D. Physics tutor
1418 Views

In a circuit with a thermistor and bulb, what happens to the brightness of the bulb as the temperature increases?

As the temperature increases, the resistance of the thermistor decreases. So the resistance of the whole circuit decreases. Using V=IR, the PD remains constant but resistance has decreased, so current mus...

Answered by Physics tutor
6252 Views

If a stationary observer sees a ship moving relativistically (near the speed of light), will it appear contracted or enlarged? And by how much.

Einstein's theory of special relativity postulates two theories; firstly the speed of light is a universal constant, and secondly the laws of physics are the same in all inertial (non-accelerating) refere...

Answered by Thomas H. Physics tutor
1475 Views

How does having a rotating plate in a microwave help food to be heated eavenly?

As microwaves are emitted from several different sources in a confined space, the waves are reflected off the internal walls and a interference pattern is formed. There are areas of destructive superstiti...

Answered by Nassina R. Physics tutor
2957 Views

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