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What is gravitational potential energy? Why is it negative?

We define gravitational potential as: the work done to bring a small "test" mass from infinity to a point. But what does this truly mean?

  1. The "work done" is simply the...

AS
Answered by Alexander S. Physics tutor
87571 Views

Please explain William the Conqueror's reasons for invading England in 1066?

The death of Edward the Confessor in early 1066 would prompt one of the most significant military campaigns in English history, the invasion of William of Conqueror. The reasons for William's invasion of ...

NM
Answered by Nicholas M. History tutor
26328 Views

Using the Trapezium rule with four ordinates (three strips), estimate to 4 significant figures the integral from 1 to 4 of (x^3+12)/4sqrt(x). Calculate the exact value of this integral, comparing it with your estimate. How could the estimate be improved?

Taking the value at the ordinates f(1) = 13/4, f(2) = 20/4sqrt(2), f(3) = 39/4sqrt(3), f(4) = 9.5 Then the trapezium rule states the integral is approximately 1/2 * [f(1) + 2f(2) + 2f(3) + f(4)], which (u...

RM
Answered by Robert M. Maths tutor
7616 Views

Solve the simultaneous equations: x2 +y2 =5 and y = 3x + 1

x=-1, y=-2 x=2/5, y=11/5 or 2 and 1/5

EH
Answered by Emily H. Maths tutor
7533 Views

How to incorporate historiography into your A Level History essays?

Historiography (or reference to professional historians's opinions) is a great way to improve the sophistication of your history essays - showing your grasp of the various debates surrounding the topic yo...

CM
Answered by Clarissa M. History tutor
1956 Views

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