OCR Physics A G484 - The Newtonian World - 11th June 2015

Anyone have a list of the experiments we need to know? Thanks

Yeah I get what you mean.. I'd either highlight what values they have in the questions or write out the values & then see if you can plug them into the equation.. If not, see if you can use another equation to convert it into a value you need!

If you're dealing with a temperature that's no constant though - always remember to convert it to Kelvin! You get method marks for that shizz..

Good luck anyway!

Anyone have a list of the experiments we need to know? Thanks

Simple Harmonic Motion:
- mass on a spring
- conical pendulum

Brownian Motion
- smoke cell under microscope
- pollen grains

Specific Heat Capacity
- Liquid mass
- Solid mass

Did a question on the shc of liquid yesterday, can vaguely remember the solid one, what are the differences? And you don't need to know how to set up the experiments for brownian motion do you? I thought you just had to make observations

thanks pal, you too! btw, would you (or anyone else reading this) be able to explain the answer to june 2013 q5 cii?

Yeah just observations and conclusions for brownian.

The difference is mainly the diagrams and the uncertainties.

So for the both of them, you can get heat losses to the surroundings if you don't insulate them and incorrect temperature change if you don't wait for the thermometer to reach its maximum value.. but for just the liquid, you can also get false temperature reading cause you need to stir it to distribute the liquid evenly.. Wouldn't recommend saying you need to stir a solid!

What is that loooool

Yeah, it's what the Kelvin Scale is based upon

How would you find shc of solid?

Yeah, it's what the Kelvin Scale is based upon

How would you find shc of solid?

Yeah, it's what the Kelvin Scale is based upon

How would you find shc of solid?

Yeah, it's what the Kelvin Scale is based upon

How would you find shc of solid?

Same as a liquid..

Take measurement of its mass, initial & final temp., I, V & t readings to find value for E then sub them all into c = E/m (delta) T

Same as a liquid,you put a heater in it, put a thermometer in it. Record temp changes and current and pd to get power, then do what you would for a liquid with the calculations of power and then E and then from there rearrange E=McΔθ . I can't remember if I'm hawing the circuit right though, the one that's connected to the heater. If anyone could show me a drawing I'd appreciate it

Can you define it then at least so i can memorise it quickly?

Insulate solid in container, use thermometer, use electrical heater with a power supply. Measure p.d across heater and current in a circuit and time for change in temperature. Draw change in temp against time graph. Calculate gradient in straight area. c=VI/mm, where m is gradient, VI is power and m is mass of block.

so a state change only occurs if Ke is changed? can someone please help me with this theory?

so a state change only occurs if Ke is changed? can someone please help me with this theory?