1,258 prompts matching "Spot my mistake multiplying a two by two matrix by a two by one matrix"
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Worked Example: Drawing the polygon of forces to scale
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Learn: What an unclosed polygon of forces tells you
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Worked Example: The moment of a force about a point on its own line of action
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Explain Back: The units of a moment, and why they are newton metres
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Learn: The algebraic sum of moments when the senses differ
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Quiz: The point about which the total moment of a set of forces vanishes
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Explain Back: Locating the point of concurrence on a diagram
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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Worked Example: Matching each force to the sine of the angle opposite it
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Explain Back: A probability distribution table for a discrete random variable
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Learn: The expectation of a discrete random variable
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Worked Example: Finding a particular term of a binomial expansion
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Learn: Finding the coefficient of a stated power in an expansion
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Explain Back: The binomial probability formula
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Quiz: The situations a Poisson distribution models
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Worked Example: The probability of no events at all in a Poisson distribution
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Explain Back: Finding n and p from a given mean and variance
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Learn: The standard deviation of a binomial distribution
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Learn: Finding lambda from a stated mean
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Quiz: The standard deviation of a Poisson distribution
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