Recent content by The Bob

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    What is the Graph of f(x) = sqrt(a^2 - x^2)?

    Hi GreenPrint. What are your initial thoughts? Also, I assume a is an arbituary constant and not specified as anything else in your original question. The Bob
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    Solving Logarithmic Equations: 2 Problems

    I agree with eumyang. Is the question to simply the above expressions? Also, with the second problem, are you missing any brackets/parenthesis at all? The Bob
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    Calculating Shade Projection for Beach Sun Shade - Math Homework Solution

    Hi hossai. Welcome to PF! The idea of these threads is to help each other solve problems they have. So, if you'd like to venutre an attempt at the solution or method for solving this then we could discuss it further. The Bob
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    Collisions question? (involving momentum)

    What have you worked out so far? Let's see some workings out. The Bob
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    Integral of Exponential function

    Ok, try here (http://en.wikipedia.org/wiki/Lists_of_integrals#Definite_integrals_lacking_closed-form_antiderivatives) under the section 'Definite integrals lacking closed-form antiderivatives' and see if that helps. If not look at this (http://www.soton.ac.uk/~adf/pubstore/pub20.pdf ). The Bob
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    Integral of Exponential function

    Hi macauor, Welcome to PF! What is putting you off? Can you show us any workings out? The Bob
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    Integration by trig substitution

    Why not using arcsin? Also, there is a factor of two missing in the 3rd step from the end. The Bob
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    Any suggestions for motion experiment ideas?

    Hi Atlaπtis. Welcome to PF! I once did any experiment with an air track and I had to see if different shaped sails made a difference to a 'boats' propulsion. I attached weights to one end and found the distance the 'boat' would travel and plotted it again mass for each. I had some problems...
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    Calculating Work and Mechanical Energy - Block on Ramp

    Because you know the force needed to overcome friction down the slope and also the normal reaction so could work out the coefficient of friction. However, you don't really need this to work it out. As you know the other information in your question you can find the work done by comparing initial...
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    Book Review (for recreational reading)

    I'll just list some books as history seems to be prevailing: > 'Animal Farm' - George Orwell > 'Nineteen Eighty-Four' - George Orwell > 'The Hitchhiker's Guide to the Galaxy' Trilogy - Douglas Adams > 'To Kill a Mockingbird' - Harper Lee > 'The Marriage of Heaven and Hell' - William Blake...
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    Calculating Work and Mechanical Energy - Block on Ramp

    Hi mimib1230. Welcome to PF. Try starting by spliting the weight of the mass into components. From this you'll have a force down the slope (but which one?) and this will then allow you to substitute the value into an equation (but which one?). See what you make of that. I will not give you...
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    Calculating Shade Projection for Beach Sun Shade - Math Homework Solution

    Just for my own clarity, does it make a 60° angle with the bit that goes in the ground or with the actual shade itself? Could you produce a diagram if this seems to be a silly question? The Bob
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    Rewriting expression of logarithm

    That's not the right first, step. What do you know about the addition of logs? If that doesn't help, substitute a = 5 and b = x2 and re-ask my question. The Bob
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    Earth and Moon (Acceleration of Gravity)

    Cool, no problem. Glad to help. All the best, The Bob
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    Graduate A simple question about isomorphisms

    Hey bmiceli21, Glad you've got a solution and thanks for posting it. Apologies for the misunderstandings on my part and well done to your colleague. The Bob