1,170 prompts matching "Spot my mistake calculating standard deviation"
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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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Quiz: The coefficient of friction between two surfaces
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Practice: Limiting friction, and the greatest value it can reach
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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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Worked Example: The total moment of three parallel forces about one end
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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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Practice: Resolving three forces in two perpendicular directions
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Explain Back: A particle hanging from two strings set at different angles
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Worked Example: Matching each force to the sine of the angle opposite it
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Learn: Finding two unknown forces by Lami's theorem
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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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Practice: Using a binomial expansion to approximate a number
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