Recent content by rhule009

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    Estimating Power of Water Waves: What Does it Mean?

    Homework Statement In my physics syllabus it says Estimate the power available from a water wave of given dimensions; What does this mean? Homework Equations The Attempt at a Solution
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    Proving the Inequality kx > ky for x < y and k < 0

    Homework Statement show that if x and y are real numbers such that x<y, then for any real number k<0, kx>ky Homework Equations The Attempt at a Solution note- this is not a homework. I am just teaching myself some algebra, so please help
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    How Can I Calculate the Downward Force on a Helicopter Using a Column of Air?

    Homework Statement going through my a level text i found a prob i cannot solve Homework Equations 1) a helicopter of total mass 1000kg is able to remain in a stationary position by imparting a uniform downward velocity to a cylinder of air below it of effective diametre 6m. Assuming the...
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    Roots & Product of ax^2 + bx + c = 0

    Prove that the sum of the roots and product of the roots of the equation ax^2 + bx + c = 0 are -b/a and c/a respectively thank you
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    What's the Trick to Proving tan3A=3tanA-tan^3 A/ 1-3tan^2 A?

    what am i doing wrong
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    What's the Trick to Proving tan3A=3tanA-tan^3 A/ 1-3tan^2 A?

    i end up with tanA+2tanA/1-tanAtanAtanA
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    Could someone please prove this identity

    tan3A= 3tanA-tan3A/1-3tan^2 A
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    Difficulty proving another identity

    could anyone explain (no calculation) how to work the following identity so could get an understanding of it thank you tan(45+A)degrees tan(45-A)degrees=1
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    What's the Trick to Proving tan3A=3tanA-tan^3 A/ 1-3tan^2 A?

    can anyone help[ me prove the following identity i keep on ending up in a dead end tan3A=3tanA-tan^3 A/ 1-3tan^2 A thank you
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