## Sample Physics questions

- Talk about Physics in the news
*(Pembroke, Oxford)* - Estimate the mass of rubber from car tyres left/deposited on UK roads each year
*(Pembroke, Oxford)* - Work out the radius of the Earth if a building has no shadow and another which is 300km away and 20m high has a 1m shadown.
*(Pembroke, Oxford)* - Draw a graph for velocity against height for a ball thrown vertically upwards into the air... and derive an expression for the gradient.
*(Pembroke, Oxford)* - Pictures of graphs were shown - and then inspect the equations (for y = e^-x^2) then x = e^-(y-1)^2 then y = x + e^-x^2
*(Pembroke, Oxford)* - What would happen if we removed one leg from the Eiffel Tower
*(Pembroke, Oxford)* - What would happen to the Earth's rotational speed when the polar ice-cap melts?
*(Pembroke, Oxford)*- Work out an expression/ratio for how long the day will be...

- If you have a negatively charged ring (with a constant charge) with a radius r, what is the electric field like in the middle?
*(Lincoln, Oxford)*- Assume you have a charged particle in the middle... as the particle moves perpendicularly outwards from the plane of the ring. Work out an expression for force in terms of r and x...

- Estimate the number of thorium atoms in the walls of a room. If the room has intermal dimensions of 20m x 10m x 10m and the walls are 1m thick. The walls are concrete and the thorium is 5 parts per million.
*(Lincoln, Oxford)* - A space rocket has 2 parts, the cabin and fuel tanker. It burns fuel at a constant rate, R.
*(Lincoln, Oxford)*- make an expression for mass in terms of time
- make an expression for force
- make an expression for acceleration
- make an expression for displacement from the starting position (assuming that it starts with a velocity of 0)