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Using Newton's law of universal gravitation, show that T^2 is proportional to r^3 (where T is the orbital period of a planet around a star, and r is the distance between them).

(Lets consider a simple planetary system composed of a planet orbiting a star. the gravitational force between the two is given by F=(GMm)/(r²). Assuming the planet also moves in a circular orb...

Answered by Karanvir S. • Physics tutor

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Interview question: Why should we give you an offer instead of another candidate; what separates you from the rest?

In answering this question, you will need to be careful, with the examiner looking forward to hearing your strengths, whilst also expecting you to be very careful in treading the line between arrogance an...

Answered by Yogi G. • Medical School Preparation tutor

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In an office there are twice as many females as males. 1/4 of the females wear glasses. 3/8 of the males wear glasses. 84 people in the office wear glasses. Work out the number of people in the office.

office that is females with glasses=(2/3)(1/4)=1/6 office that is males wearing glasses=(1/3)(3/8)=1/8 (1/6)/(1/8) = 8/6=4/3 so there is a ratio of 4:3 women to men wearing glasses 84*(4/7)=12

Answered by William J. • Maths tutor

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What is the difference between a longitudinal and a transverse wave?

Waves that go up and down in a curvy shape like you would draw on a piece of paper are called transverse waves. Scientifically, these are when the particles move in a direction that is perpendicular (90) ...

Answered by Sarah F. • Physics tutor

10256 Views

How do I plan an answer to a close reading question in my exam?

The first thing I tell students is when presented with a question, take time to plan. Do not start writing immediately - most of what you will produce won’t be much good. In a lesson, I provide students w...

Answered by Peter C. • English Literature tutor

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