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Physics
GCSE

Explain the input and output energy sources for a car engine. How would you calculate the efficiency? Explain in terms of the inputs and outputs how the efficiency could be improved.

The input is chemical energy (in the form of fuel). The outputs areSound (not useful)Kinetic (useful)Heat (may be useful)The efficieny is given by useful output energy divided by total input (or output) e...

Answered by Samuel H. Physics tutor
14667 Views

Sketch a graoh of current against potential difference for a filament lamp and explain its shape.

(draw diagram on whiteboard) As the potential difference increases, the current increases, since V=IR (where V is the potential difference, I is the current and R is the resistance). Initially the current...

Answered by Tamanna D. Physics tutor
1751 Views

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 ...

Answered by Zubin M. Physics tutor
3555 Views

A particle of mass 5kg is acted upon by a force of 400N for a distance of 20m along the x axis. What is its final velocity if it is initally at rest?

The work done by a force on a particle is: Work done = Force x Displacement.The energy of a particle is given by the sum of its potential and kinetic energies.As the particle does not gain or lose any hei...

Answered by Luke T. Physics tutor
1670 Views

A student has loaded a spring beyond its limit of proportionality. What does this mean?

The limit of proportionality is the is the point beyond which Hooke's law is no longer true when stretching a material.

Answered by Alessandra P. Physics tutor
3252 Views

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