Titlebook: Mastering Physics; H. J. P. Keighley,F. R. McKim,M. J. Harrison Textbook 1986Latest edition Macmillan Publishers Limited 1986 physics

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格言

Machineslarge one, for example when a screwdriver is used to ‘lever’ a lid off a tin. Sometimes a small movement is amplified into a large one, as in a bicycle when a small pedal movement results in a much larger movement of the bicycle along a road.

浪费物质

遭遇

Change of State tripod and heated very gently with a bunsen burner it will be found that the temperature remains at 0°C until all the ice has melted. The temperature of the water then begins to rise and goes on rising until it reaches 100°C. Heat energy is still being supplied to the beaker from the bunsen burner

不透气

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. 14.1). The bright line across the paper from the slit marks the path of the ray, which is a straight line.

Permanent

Thin Lenses and Curved Mirrorsrge just as if they had suffered a single refraction at a plane somewhere inside the glass. For the purposes of ray constructions we represent a thin lens by a single line (AB in Fig. 16.1), where the refraction is considered to take place.

缓解

Vectorsdy in opposite directions? Two forces, one of 5 N one way and the other of 3 N the other way are equivalent to one single force of 2 N in the first direction. The single force to which the other two added together are equivalent is termed the resultant force.

constitute