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Pedro123's latest activity
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Pedro123
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Proof question help.
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Here's a brief rundown, reply if you want a more detailed response. Take 3 points A, B and C. Draw lines AB and BC, labelling their...
Thursday at 12:43 PM
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Pedro123
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blyatman's post
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Definite Integral
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Yes that's the definition of an integral. An integral is essentially just an infinite sum, so the upper limit of the sum needs to go to...
Jun 22, 2020
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Pedro123
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fan96's post
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Hard enrichment question from the Cambridge textbook!
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In more concrete words, you are asked to show n = \cos^{-1} \frac 35, given the conditions a \cos \alpha = 1, a \cos (n+\alpha) = 5...
Jun 15, 2020
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Pedro123
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Drdusk's post
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Polynomials question
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Because it says P(x) is an odd polynomial. With an odd function P(x) = -P(x). It also has degree 3. You can only have a degree 3...
Jun 14, 2020
P
Pedro123
replied to the thread
Definite Integral
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Yes there is, but it's a pain to do, which is why we don't consider it compared to first principles for differentiation. I would write...
Jun 12, 2020
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Pedro123
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blyatman's post
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Mean of a function
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Consider this example: Suppose you have a moving object, whose velocity varies according to some velocity function v(t) between t = 0 to...
Jun 1, 2020
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Pedro123
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TheShy's post
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Please help?
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a) dy/dx =2x-5. Sub in x=2 into dy/dx to find gradient. Then use the y-y1=m(x-x1) to find tangent. The normal is the same but the...
May 25, 2020
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Pedro123
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mikikieko12's post
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Bromine water question
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When bromine water is added to cyclohexene, cyclohexene readily reacts with the bromine and opens the double bond as it bonds to the...
May 21, 2020
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Pedro123
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jazz519's post
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Heat of Combustion Help
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Usually for practical exams you should know: - Aim - Hypothesis - Safety issues and how to resolve them - Method (and why you do things...
May 18, 2020
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Pedro123
replied to the thread
Human Rights
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You probably want to do both - so a more general overview as to what each body does, and then a more specific analysis of how they help...
May 18, 2020
P
Pedro123
replied to the thread
Quantitative chemistry
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Mol of H2S = 16/(1.008*2+32.065) = 0.469 mol Mol of SO2 = 20/(16*2+32.065) = 0.312 mol This means that since the ratio should be 2:1...
May 17, 2020
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Pedro123
reacted to
jazz519's post
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WHAT HAPPENS TO MY STUFF?!
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It depends on the school but my email I remember went inactive after like a year. What I did to get around that issue without having to...
May 12, 2020
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