# Read about a level physics | 8 Discussions | Page 1

1. ### Problems with UK A level Physics Marking Schemes

Hi Folks, I am a private tutor and one thing I teach is A level Physics (OCR Physics A). Am I the only person who has been sometimes baffled and deeply disappointed with some of the questions/answers? Let me explain what I mean. I see questions form which it's not possible to decide what kind...
2. ### Is energy profile of a spring asymmetric with +x and -x?

Homework Statement [/B] The problem is with part b(ii). This is an A level question so only elementary concepts are to be used. Homework Equations $$E = \frac{1}{2}kx^2$$ The Attempt at a Solution EPE should be max at 0, 0.4, 0.8 since E is a function of $x^2$. However, mark scheme only...
3. S

### Derivation of an expression for centripetal acceleration

Homework Statement I have derived the expression for the velocity of the satellite v= root of GM/r however I'm struggling to derive an expression for the centripetal acceleration of a satellite orbiting Earth. Homework Equations The Attempt at a Solution I'm not entirely sure which equations...
4. ### Pulse echo technique to find the distance of the Moon

Homework Statement [/B] Over 40 years ago, the Apollo astronauts placed reflectors on the surface of the Moon. These are still used by a number of observatories on Earth to monitor the distance to the Moon by reflecting pulses of laser light from them and detecting the reflected signal...
5. ### Freewheeling bicycle and friction

Background question: A bicycle and rider have a combined mass of 75 kg. They freewheel down a slope whose maximum height is 6 meters above sea level. The slope is 20 meters long. At the end of the slope, the bicycle and rider are travelling with a velocity of 10 m/s. Calculate the work done...
6. ### Circular motion A-Level

Homework Statement An aircraft flies with its wings tilted, in order to fly in a horizontal circle of radius r. The aircraft has mass 4.00 x 104 Kg and has a constant speed of 250ms-1 . with the aircraft flying in this way, two forces are acting on the plane, P [lift] and W [weight which is...
7. ### Centripetal Force

I can't seem to post pictures, but I will give the link to the question along with the link to the answer given in the mark scheme. Here goes: Question: http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w07_qp_4.pdf Answer link (mark...
8. ### A level physics tutoring

I would like to make contact with others who perform A level physics tutoring in the UK, especially those who are online providers I have tutored AS/A2 students over a period of time and would like to share ideas and information with others doing the same Dr Jon P Harris