Titlebook: Mastering Physics; H. J. P. Keighley,F. R. McKim,M. J. Harrison Textbook 1984Latest edition Macmillan Publishers Limited 1984 physics

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爵士乐

Work, Energy and Power loads by burning oil or petrol. People can do similar jobs, for example lifting cases into the boot of a car. In order to do this, they must take in energy by eating food. If we were unable to get this ‘food energy’, or . as scientists call it, we could not work and we would grow weaker and weaker.

过分自信

Lobotomy

Reflections and Shadowsh a narrow slit in front of it, the light is easily seen where it falls on a surface, for example a sheet of paper (Fig. 15.1). The bright line across the paper from the slit marks the path of the ray, which is a straight line.

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