112 APPLIED SCIENCE 



3. How many units (B.T.IT.) will be required to raise 4863 Ihs. 

 of water 62 F.? 



4. How many units (B.T.U.) will be required to raise 785 Ibs. 

 of water from 74 F. to 298 F.? 



5. How many units of heat will be necessary to raise 40 g. from 

 50 C. to 70 C.? 



6. A wrought iron bar 22 ft. long is heated from 70 F. to 300 

 F. How much will it lengthen? 



7. A straight pipe 256 ft. long is heated from a tempera- 

 ture of 50 F., to a temperature of 370 F. How much will 

 the pipe expand? How much would a brass pipe expand 

 under the same conditions? (Coefficient of expansion of brass is 

 .00001052. Coefficient expansion of iron is .0000065 ft. per foot 

 of length per degree Fahrenheit.) 



8. A bar of copper 12 ft. 6 in. long at 82 F. is heated to 289 F. 

 What is its length while it is at 289 F.? 



9. A brass rod measuring 36 ft. 3 in. at 78 is heated to 188 F. 

 What is its greatest length? 



10. A flat surface of zinc measuring 4 ft. 6 in. is heated from 81 

 F. to 312 F. How much does the surface expand? 



