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Derive an expression to show that for satellites in a circular orbit T^2 ∝ r^3 where T is the period of orbit and r is the radius of the orbit.

This question is concerned with balancing forces. First, we must consider what forces are acting on the satellites. What is stopping the satellite from shooting off into space and what is preventing it from ...
CM
Answered by Charlie M. • Physics tutor
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Why is the derivative of the exponential function itself?

The exponential function is defined as a power series, which we may (for reasons that are beyond the scope of A-level) differentiate term by term to get another power series. The general term of the series d...
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Answered by George B. • Maths tutor
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What are the functions of pressure groups.

Educative ; pressure groups have a educative function in that they can provide information and education about their specific cause and spread awareness on the issue .E.g. the Heathrow Association for the co...
TA
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evaluate the integral of lnx

this is an example of an integration by parts problem, we must use integration by parts to evaluate this integral;although this would not be entirely obvious as the integral does not seem to be the product o...
AR
Answered by Aaron R. • Maths tutor
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Lenin was able to consolidate Bolshevik Rule by combining popular policies and repression. Discuss.

It is indeed fair to say that Lenin consolidated Bolshevik rule by combining popular policy with repression, and this can be explored by looking at how Lenin tackled his April Theses promise of “peace, land ...
MT
Answered by Maya T. • History tutor
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