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What are the different kinds of nuclear radiation?

There are three kinds of nuclear radiation that you need to know for GCSE physics, and each is considerably different from the others. Firstly, alpha radiation: this is when a chunk of the nucleus is emitted...
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Answered by Matthew M. • Physics tutor
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Describe the forces acting on a skydiver jumping out of a plane and explain why opening a parachute reduces the velocity

Initially the air resistance (r) is low, and the force due to gravity (mg) is high. These forces are unbalanced so the skydiver accelerates downwards. (mg > r)As the velocity increases the force of air re...
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Answered by Fred J. • Physics tutor
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Describe the different forces upon a falling object with reference to Newton's first law.

A falling object will reach terminal velocity when the force draging it down (ie its weight due to gravity) is equal to the air resistance opposing the motion upwards. When the two forces are equal the objec...
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Answered by Adam L. • Physics tutor
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Why do we say that objects moving in a circle have acceleration even if their speed remains constant?

Because their speed might remain constant, but their velocity doesn't. Remember, velocity is a vector, so it has magnitude (which is the speed of the object), but also direction. For an object moving in a ci...
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Answered by Boris A. • Physics tutor
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Kinetic theory describes the movement of particles in three states of matter. If a cube of ice is put in a tin with a tight fitting lid and continuously heated, why does the lid explode off?

Before heating: Ice and air present in the tin, the ice particles vibrate about fixed positions, they do not exert a pressure on the lid at this time, air particles inside the tin hit the lid but exert the s...
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Answered by Tom M. • Physics tutor
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