62 Domestic Science 



QUESTIONS 



1. One arm of a weighing-machine is 10 ft. 6 in. long and <the 

 other 1 ft. What would be the actual weights of the lumps of iron 

 used with this machine marked " 10 cwt.", " 56 Ib." ? 



2. In an ordinary steelyard a weight of 1 oz. balances a weight 

 of 1 Ib. suspended from the end of the shorter arm. The length 

 of the long arm is 12 /x . Find the length of the short arm. 



3. A 56 Ib. weight is suspended from a stout wooden beam 

 at a distance of 2 ft. 6 in. from the centre of the beam, which is 

 supported at its middle point so that it is free to turn about that 

 point. Where must a weight of 35 Ib. be hung on the other half 

 of the beam in order to maintain the beam in a horizontal position ? 



4. Find by calculation the number of ounces in 6 kilograms 

 and the number of grams in a hundredweight. 



5. An ordinary brick measures 9" X 4|" X 2|" and is twice as 

 heavy as the same volume of water. If a cubic foot of water weighs 

 62 '4 Ib., what is the weight of a brick ? 



6. A sheet of cardboard 1" long and 5" wide weighs 22 '78 g. 

 A circle cut from the same sample of cardboard weighs 34'60 g. 

 Find the radius of the circle. 



7. 50'0 c.c. of clay weigh 95'Og. What weight of clay is 

 contained in a cylinder of that material 50*0 cm. long with a diameter 

 of 5*0 cm. ? 



8. Give a detailed description of the method you would adopt 

 in order to find as exactly as possible the weight of 1 inch of a sample 

 of fine copper wire by means of a balance which is only capable 

 of weighing bodies under 25 g. in weight to the nearest centigram. 



9. A see-saw is formed by balancing a plank 12 ft. long about 

 its centre on a wooden trestle. A child weighing 60 Ib. sits on one 

 end of the plank, and is balanced by a man weighing 10 st. Where 

 must the man be seated ? 



