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the moon takes 27.3 days (2.36x10^6s) to orbit the earth . Calculate its distance from the earth . Take the mass of the earth to be 5.975x10^24kg.

Use the set formula T²=(4Pi^2/GM)R^3 and rearrange for r^3 to give
r³= T²GM/ 4Pi²
then insert values : r³ = (2.36x10⁶)²

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Single electrons travelling at 550 ms^-1 are passed through a diffraction grating with a spacing between the slits of 2.5 micrometers. What would the angle between the zeroth and first maximum of the resulting interference pattern be?

This is a question based loosely around the specification of the OCR A-Level Physics B course, requiring the student to recall two important quantum mechanical relations, first with one from the A2 part o...

Answered by Tom H. • Physics tutor

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How high can you raise a kilogram of sugar with 1 kWh of electrical energy? (To 2 s.f in kilometres)

The first thing to recognise is that the terms 'sugar' and 'electrical' are there to confuse you - the substance raised and the type of form of energy used to raise it are not important to the question.

Answered by Alexander L. • Physics tutor

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Explain what is meant by “terminal velocity” with regards to falling objects.

Terminal velocity is the maximum velocity (a vector quantity that accounts for speed and direction) that can be attained by a falling object of a certain surface area. Objects accelerate downwards due to ...

Answered by Rachel J. • Physics tutor

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Do the SUVAT equations work for acceleration that changes with time?

It depends on how much it changes. For instance, if some object does undergo as good as makes no difference constant acceleration, then the SUVAT equations apply quite well to the circumstances a...

Answered by • Physics tutor

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