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The teacher quickly inverts the can containing boiling water into a bowl of cold water, as shown in the diagram. When the can is inverted in the cold water, the can collapses. Use ideas about particles and pressure to explain why the can collapses.

Initially the average kinetic energy of the trapped air within the can is much higher the surrounding body of air. However, when immersed in the cold water, there is a significant decrease in the average kin...
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Answered by Zubin M. • Physics tutor
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State what is meant by resonance and provide some examples where it is crucial.

Resonance is where a system is forced to oscillate at a frequency close or at its natural frequency. The result of the forced oscillation produces a maximum energy transfer and, therefore, a large increase i...
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Answered by Zubin M. • Physics tutor
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Maths A-level Question, Rates of change involving a cylindrical vessel.

What do we know (IN) dv/dt = o.4π(OUT) dv/dt = 0.2π(h) 0.5 Initial height of water in vessel is 2.25m Diameter = 4m a) Show that at time t minutes after that tap has been opened, the height h m of the water ...
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Answered by Zubin M. • Maths tutor
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Make h the subject of h-36=(3h+18)/i

First, multiply both sides of the equation by 'i' to remove the fraction: i(h-36) = 3h +18 Then, expand the bracket by multiplying 'i' by each of the terms inside (first h then '-36'). Make sure to keep the ...
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Answered by Rebecca T. • Maths tutor
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Factorise fully 27x^2 - 3

First, work out what number is a common factor of both terms - in other words what number 'goes into' both 27 and 3? 3 is a factor of both so put 3 outside the bracket. = 3( __ - __) Now work out what goes i...
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Answered by Rebecca T. • Maths tutor
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