1,019 prompts matching "A set closed under one operation but not another"
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Learn: The parabola y squared equals 4ax, with its focus and directrix
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Worked Example: The parametric form of a point on a parabola
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Explain Back: The eccentricity of an ellipse
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Learn: The range, and why it is a weak measure of spread
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Learn: The moment of a force about a point, and its units
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Worked Example: The sign convention for clockwise and anticlockwise moments
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Explain Back: Finding the reaction at each support of a loaded beam
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Worked Example: Relative velocity when two bodies move along the same line
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Explain Back: The course to steer so that a boat crosses straight over
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Learn: Two particles joined by a light inextensible string over a smooth pulley
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Worked Example: The common acceleration of two connected particles
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Explain Back: A particle on a rough table connected to a hanging particle
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Learn: Resolving the weight along and perpendicular to an inclined plane
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Worked Example: The normal reaction on a body resting on a smooth incline
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Explain Back: The angle of friction, and the coefficient of friction
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Learn: Angular velocity, and how it relates to linear speed
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Worked Example: The acceleration of a body moving round a circle at constant speed
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Explain Back: A car on a banked track
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Learn: The defining equation of simple harmonic motion
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Worked Example: The amplitude, period and frequency of a simple harmonic motion
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