1,334 prompts matching "A sign error in the formula, and how to catch it"
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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WAEC Prep: A three-unknown system arising from a word problem
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WAEC Prep: When the matrix method is worth the work for three unknowns
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WAEC Prep: The weight of a body on the moon compared with on earth
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WAEC Prep: The resultant of two equal forces at sixty degrees
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WAEC Prep: Resolving before compounding several forces
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Practice: The parallelogram law of forces
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Spot My Mistake: Compounding three forces acting at one point
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WAEC Prep: The angle the resultant makes with the larger of two forces
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WAEC Prep: Two forces acting in opposite directions
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WAEC Prep: Why one component vanishes when the direction is chosen well
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WAEC Prep: The resultant of four concurrent forces
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Practice: The direction of the resultant of several coplanar forces
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WAEC Prep: A rigid body held in equilibrium by four forces
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WAEC Prep: The three unknowns a rigid body problem usually carries
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WAEC Prep: The polygon of forces for five concurrent forces
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WAEC Prep: The resultant read off an unclosed polygon
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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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WAEC Prep: A body just about to slide on a horizontal surface
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