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What is the difference between nuclear fusion and nuclear fission?

This is a common question in A-level physics and a core concept for the course. Fission occurs when a heavy nucleus splits into smaller, more stable nuclei, releasing energy in the process. Fusion occurs whe...
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Answered by Adam T. • Physics tutor
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A yacht is sailing through water that is flowing due west at 2m/s. The velocity of the yacht relative to the water is 6m/s due south. The yacht has a resultant velocity of V m/s on a bearing of theta. Find V and theta

First we make a sketch of the situation. Then we notice that V can be found by using Pythagoras. Finally, we find theta using the definition of a tan.
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Answered by Kestutis G. • Physics tutor
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(ii) Describe and explain how the horizontal component of the water jet varies from point X to point Y. (2 marks)

(ii) Air resistance is said to be negligible in the question and since air resistance would be the only horizontal force acting on the jet, the horizontal force is also 0. (1 mark) This results in the horizo...
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Answered by Tate C. • Physics tutor
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A water jet starts at a point X and reaches its maximum height at a point Y. Air resistance has a negligible effect on the motion of the water jet. (i) State the direction of the force acting on the jet at Y. (1 mark)

(i) The only force acting on the water jet is gravity which always acts vertically downwards so the force at Y, as well as every point between X and Y, is down.Simply writing "down" would still get...
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Answered by Tate C. • Physics tutor
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An ideal gas at a temperature of 22 C is trapped in a metal cylinder of volume 0.2 m^3 at a pressure of 1.6x10^6 Pa. The gas has a molar mass of 4.3 x 10^(-2) kg mol^(-1). Calculate the density of the gas in the cylinder.

It's useful to start from the density formula and see what we need to find. The density is given by (rho) = m/V We know the volume V, so we only need to find the mass m. We are given the value for molar mass...
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