. Practical physics. etting a watch. The rocker R is pivoted at 5 ; C carries the mainspringand ^ the hands; is a light spring which normally keejis thewheel A in mesh with C. Pressingdown on P, however, releases Afrom C and engages B with mechanical principles doyon find involved ? What happenswhen M is turned backward ? 13. A man runs up a flightof stairs 60 ft. high in 10 sec. Whatis his power while doing it?How do you account for the result ? 14. A thousand-barrel tank at amean elevation of .50 ft. is to befilled with water. How nuxch workmust be done to fill it
. Practical physics. etting a watch. The rocker R is pivoted at 5 ; C carries the mainspringand ^ the hands; is a light spring which normally keejis thewheel A in mesh with C. Pressingdown on P, however, releases Afrom C and engages B with mechanical principles doyon find involved ? What happenswhen M is turned backward ? 13. A man runs up a flightof stairs 60 ft. high in 10 sec. Whatis his power while doing it?How do you account for the result ? 14. A thousand-barrel tank at amean elevation of .50 ft. is to befilled with water. How nuxch workmust be done to fill it, assuming abarrel of water to weigh long would it take a 2-horse-power electric motor to fill it ? 15. What must be the power of an engine which is to pump10,000 1. of water per second from a mine 150 m. deep? (Take 76 kilo-gram meters per second = 1 horse power.) 16. A water motor discharges 100 1. of water per minute when fedfrom a reservoir in which the water surface stands 50 m. above the level. Fig. 484. Winding and setting mech-anism of a stem-windinsT watch 454 APPENDIX of the motor. If all of the potential energy of the water were transformedinto work in the motor, what would be the horse power of the motor ?(The potential energy of the water is the amount of work which wouldbe required to carry it back to the top of the reservoir.) 17. A rifle weighing lb. discharges a bullet weighing oz. witha velocity of 2600 ft. per second. What is the kinetic energy of the bullet;the velocity of recoil of the rifle ; the kinetic energy of the rifle? Chapter VIII. 1. What fractional part of the air in a room passesout when the air in it is heated from — ^C. to 20C? ( —15C. = 258A.;20C. = 293A.) 2. If the volume of a body of gas at 20C. and 76 em. pressure is500 cc, what is its volume at 50°C. and 70 cm. pressure? 3. An automobile tire contained air under a of 70 lb. persquare inch at a temperature of 20C. On being driven, the temperatureo
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