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A stationary particle explodes into 3: A (to the left), B and C (both to the right). B has mass m and speed 3v. C has mass 2m and speed v. A has speed 2v. What is the mass of A in terms of m?

The key to solving this is remembering that momentum is conserved. The large, initial particle has no speed so its momentum is zero. Therefore, if we add together the momenta of the final particles we also g...
SP
Answered by Seth P. • Physics tutor
2484 Views

What is Newton's Third Law and what is an example of it?

Newton's Third Law looks at what happens when two objects interact with each other. The definition of Newton's Third Law is, "When one body exerts a force on a second body, the second body simultaneousl...
MO
Answered by Maxwell O. • Physics tutor
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A uniform plank of wood of mass 32 kg and length 4.0 m is used to cross a ditch. In the ditch is a rock, which is used to support the plank horizontally 0.80 m from one end. The other end is supported by the bank. Calculate the rock's supporting force.

We need to calculate moments about a point through which one of the forces is acting. I choose the bank support point. At this point, moments are caused by the weight of the plank acting at its centre of mas...
RS
Answered by Ricardo S. • Physics tutor
13296 Views

What conditions are required for simple harmonic motion?

Acceleration is directly proportional to the displacement from the position of equilibrium. Also the resultant force is therefore also directly proportional to this displacement, and the resultant force alwa...
WC
Answered by William C. • Physics tutor
37187 Views

Is light the fastest? if no, then explain quantum entanglement!

No, light is not the fastest travelling thing in this universe and quantum entanglement fully supports my openion. It is interesting to note that every light sorce converges to a point source as we move away...
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Answered by Prashant .. • Physics tutor
2798 Views