1,327 prompts matching "The discriminant used as the test for intersection"
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Explain Back: Why the total moment about any point must be nought
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Learn: Choosing the point about which to take moments
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Learn: What an unclosed polygon of forces tells you
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Practice: Finding an unknown force from a closed polygon
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WAEC Prep: Why friction is called a self-adjusting force
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Quiz: The coefficient of friction between two surfaces
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Spot My Mistake: Why friction does not depend on the area of contact
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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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WAEC Prep: Why three non-parallel forces in equilibrium must be concurrent
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Explain Back: Locating the point of concurrence on a diagram
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Practice: Resolving three forces in two perpendicular directions
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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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Learn: The expectation of a discrete random variable
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Learn: Finding the coefficient of a stated power in an expansion
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Spot My Mistake: The probability of exactly r successes in n trials
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Quiz: The situations a Poisson distribution models
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Practice: The probability of exactly r events in a Poisson distribution
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Learn: The standard deviation of a binomial distribution
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