A manual of physics, theoretical and practical : for medical students / by Hugh C. H. Candy.
- Candy, Hugh Charles Herbert, 1859-1935
- Date:
- 1918
Licence: In copyright
Credit: A manual of physics, theoretical and practical : for medical students / by Hugh C. H. Candy. Source: Wellcome Collection.
60/470 (page 46)
![couple ; the perpendicular intercepted between them is the arm of the couple ; the product of one force and the arm is the moment of the couple. A screwdriver in use, or a screw press worked by both hands, illustrates the action of a couple (see also p. 313). Exercises 1. The bob of a simple pendulum is deflected so that the string makes an angle of 60° with the vertical. Determine the direction and magnitude of the acceleration of the bob at the moment when it is released. {First M.B.] 2. A screw having a pitch of 1 cm. is worked by a power arm 50 cm. long. What is the theoretical mechanical advan¬ tage, and what force must be exerted on the power arm to lift 1,000 kilograms ? {Ihid.l 3. If a man can exert at the handle of a windlass a force of 20 lb. and move the handle through 3 ft. a sec., calculate his power in proper units. {First Professional.'] (For Answers, see p. 388.)](https://iiif.wellcomecollection.org/image/b29927973_0060.jp2/full/800%2C/0/default.jpg)
