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What's the moment of a force and why would I need to understand it?

Mathematically you'd express it as M=F x d, Moment = Force times distance (from the pivot), unit being Nm, Newtons times meters. Simply speaking, it's how you quantify an object's ability to rotate around it...
Answered by • Physics tutor
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'The Weimar constitution of 1919 was no more democratic than the Bismarckian constitution of 1871.' Discuss

Interesting question inviting you to compare, contrast and evaluate. Consider what the question is asking you to do - ultimately it wants you to evaluate how 'democratic' the two German constitutions were - ...
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Answered by Anna H. • History tutor
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32sqrt 2 = 2^a, find the value of a

Ok so this is a typical exam questions worth around 3-4 marks depending on which exam board you are sitting with.To start solving this problem, we are looking for 2 to the power of "something" - so...
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Answered by Shannon M. • Maths tutor
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Write x² + 4x -16 = 0 in the form (x+a)² - b = 0. Solve the equation giving your answer in surd form as simply as possible.

x² + 4x -16 = 0 (x+2)² -20 = 0 We note that the coefficient of x 2 is 1 and the coefficient of x is 4. Therefore we say the that square is (x+2). This leaves us with an additional 4 from this expansion. We m...
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Answered by Henry H. • Maths tutor
4851 Views

Ammonia is made from nitrogen and hydrogen in a reversible reaction. Write a balanced symbol equation for this reaction, name the reaction and give one use for ammonia.

N 2 + 3H 2 ⇌ 2NH 3 The Haber process, and ammonia is used in the production of many synthetic fertilizers.
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Answered by Henry H. • Chemistry tutor
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