1,202 prompts matching "Why a conditional and its contrapositive are equivalent"
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Worked Example: The equation of a circle with a given centre and radius
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Quiz: Finding the centre and the radius from the general equation
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Show All Working: The intersection of a circle and a straight line
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Spot My Mistake: The standard deviation of an ungrouped set of data
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Show All Working: The effect on the standard deviation of adding a constant to every value
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Worked Example: The sign convention for clockwise and anticlockwise moments
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Final Revision: A ladder leaning against a wall, and the moments acting on it
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Show All Working: A lift, and the person standing in it
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Explain Back: The angle of friction, and the coefficient of friction
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Quiz: The centripetal force, and what supplies it in a given situation
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Show All Working: A body in a vertical circle, and the tension at the top
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Final Revision: The period and the frequency of circular motion
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Worked Example: The amplitude, period and frequency of a simple harmonic motion
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Practice: The maximum speed and the maximum acceleration in simple harmonic motion
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Practice: The difference between an elastic string and a spring in compression
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Spot my mistake: Assuming AB and BA give the same matrix
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Spot my mistake: Negating the leading diagonal and swapping the other two entries when inverting a 2 by 2 matrix
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Spot my mistake: Treating the kilogram and the kilogram weight as the same unit
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Spot my mistake: Assuming moments may only be taken about the pivot and never about another point
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Spot my mistake: Treating the action and the reaction of Newton's third law as forces acting on the same body
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