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1. ### The only trajectory problem on my whole SI sheet (trajectory) I cannot do

If the ball hits the wall at an angle of 45° after traveling 25m upwards, what does that tell you about what the maximum height reached would have been if the wall was not present?
2. ### General Relativity Concepts

Yeah, perhaps I should have clarified that slightly, GPS does use both GR and SR in order to attain the precision that we expect nowadays.
3. ### General Relativity Concepts

Hi Rapier! In question 6, \gamma denotes the Lorentz factor, \gamma=\frac{1}{\sqrt{1-\frac{v{^2}}{c^{2}}}}. Does this help you determine the correct answer? For question 11, as you correctly said, we have the idea of a relativistic mass. This is the "actual" mass of an object traveling at...
4. ### Coulomb's Law (Finding magnitude & direction of net force)

Check your units for d! :)
5. ### Looking for A-Level Physics Exams

http://www.ocr.org.uk/qualifications/type/gce/science/physics_a/documents/ [Broken] OCR maintain a stock of all their A-level past papers free for anyone to download. This is the exam board I did my A-level physics with, I wouldn't say they are particularly difficult at all, although the grade...
6. ### Understanding Physics for the Beer Mug Problem

Well, start with the x-component of v_f. What will that be? Remember there's no friction whilst the mug is sliding, and I assume there is no air resistance.
7. ### Understanding Physics for the Beer Mug Problem

How do you think vx and the sliding velocity compare? Think about it, don't try use the equations!
8. ### Explaining a Physics Phenomenon with a Snowy Photo

Well, I could derive why it produces a hyperbolic cosine here, if you like? With regards to a qualitative explanation, I'm sure someone else can provide a clearer answer than myself.
9. ### Bohr atom problem.

Well, your solution is incorrect at two significant figures, so I presume your book didn't make that assumption, and you may have to use reduced mass in the future. It seems like you have been asked to find the first Lyman series wavelength for this atom, correct? You have worked out the...
10. ### Bohr atom problem.

I wouldn't say it was resolved in the wrong way, your reasoning will work well enough for any purpose where the orbiting particle has negligible mass compared to the nucleus. The same idea applies when we model planetary orbits. Assuming that the orbiting body orbits the centre of mass of the...
11. ### Explaining a Physics Phenomenon with a Snowy Photo

Not quite parabolic, try hyperbolic!
12. ### Bohr atom problem.

By simply replacing me with 207me, you are assuming that the meson is orbiting the centre of mass of the hydrogen proton. This assumption is valid for electron orbits as their mass is negligible for all intents and purposes, but as the proton is only ~9 times more massive than the meson, we must...