429 prompts matching "What radioactivity is, and why some nuclei are unstable"
Practice set: Stable, unstable and neutral equilibrium
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Spot my mistake: Confusing the centre of gravity with the centre of a shape
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Real-life Nigeria: Stability in Nigerian lorries and market stalls
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Quiz: Measuring the density of a solid and of a liquid
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Practice set: The hydraulic press, and the principle Pascal gave it
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Exam prep: Archimedes' principle and the law of flotation stated
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Spot my mistake: Assuming pressure depends on the volume of liquid
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Real-life Nigeria: Hydraulic brakes and jacks in Nigerian vehicles
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Exam timing: A timed set of pressure and density problems
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Quiz: Luminous and non-luminous bodies
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Practice set: The pinhole camera and the image it forms
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Exam prep: Eclipses of the sun and of the moon
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Spot my mistake: Confusing the umbra with the penumbra
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Real-life Nigeria: Shadows and sunlight in Nigerian building design
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Practice set: Curved mirrors, concave and convex
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Spot my mistake: Drawing the reflected ray on the wrong side of the normal
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Real-life Nigeria: Concave and convex mirrors in Nigerian use
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Exam prep: The critical angle and the condition for total internal reflection
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Spot my mistake: Applying Snell's law with the two media the wrong way round
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Quiz: The principal focus, the focal length and the optical centre
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