250 prompts matching "Finding an unknown force on a balanced beam"
Exam prep: The simple d.c. motor and how it turns
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Real-life Nigeria: Electric motors in Nigerian homes and industry
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Teach me: What a transformer does, and why it is needed
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Quiz: The structure of a transformer and its two coils
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Let me explain: Step-up and step-down transformers
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Practice set: The efficiency of a transformer
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Exam prep: Energy losses in a transformer, and how they are reduced
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Physics at work: Why electricity is transmitted at high voltage
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Teach me: The structure of the atom and the particles in it
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Quiz: The Rutherford scattering experiment and what it showed
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Let me explain: Atomic number, mass number and isotopes
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Worked example: Writing the nuclide notation for a given atom
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Exam prep: The models of the atom compared, from Thomson to Bohr
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Spot my mistake: Confusing atomic number with mass number
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Teach me: What radioactivity is, and why some nuclei are unstable
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Exam prep: The cloud chamber and the photographic plate as detectors
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Teach me: What half-life means
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Quiz: The decay curve, and reading a half-life from it
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Let me explain: The random nature of radioactive decay
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Real-life Nigeria: Radioisotopes in Nigerian medicine and agriculture
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