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There is a train A. On the roof of A is another frictionless train B of mass Mb. A mass Mc hangs off the front of A and is attached to the front of B by rope and frictionless pulley. How fast should A accelerate so that B wont fall off the roof of A.

You must carefully draw a diagram. The key to this question is to find from what perspective you should view it. The easiest way is to see that B wants to accelerate due to the weight of C. This is unaffecte...
SO
Answered by Sean O. • Physics tutor
2477 Views

What is the optimum angle to throw a snowball for maximum horizontal displacement? (Ignore air resistance, assume the snowball is thrown level with the ground. The angle is measured from the ground up)

Shortest answer: 45 degrees Short Answer: If the snowball is thrown at velocity v, at angle θ The vertical component is vsin(θ) The horizontal component is vcos(θ) v = u + at t = v/a (u = 0) Airtime = 2vsin(...
JT
Answered by James T. • Physics tutor
7200 Views

The Large Hadron Collider (LHC) of circumference 27km uses magnetic fields to accelerate a proton repeatedly in a circular path. Calculate the flux density of a uniform magnetic field required for the proton to travel at a tenth of the speed of light.

Firstly, we must clearly set out the information we have. The particle in question is a proton, which has a mass of 1.67e-27 kg, and a charge of 1.6e-19 C. The path it takes has a circumference of 27000m, me...
AM
Answered by Aashish M. • Physics tutor
8531 Views

What is Coulomb's law

These are usually 2 or 3 mark questions and should be a really easy source of marks in any paper. The marks will be awarded for stating the 2 key point of the law and in some cases for writing out the equati...
RP
Answered by Ruadhan P. • Physics tutor
21755 Views

A rock has a mass of 100g and it is thrown across a pond at a speed of 30ms^-1. Calculate the de Broglie wavelength of the rock and explain whether you can see the wave produced.

λ=h/p λ=h/mv λ= 6.63 10^-34/0.1 30 λ= 2.21*10^-34m We cannot see the rock's de broglie wave because its wavelength is much smaller than that of the visible spectrum
LM
Answered by Liam M. • Physics tutor
3759 Views