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THE MECHANICAL POWERS. 



THE INCLINED PLANE. 



To find the power or force required to raise a> given weight 

 up an inclined plane of a given length and height. 



KULE. As the length of the plane is to its height, so is 

 the weight to the power. 



EXAMPLE. Required the power necessary to raise 1500 

 Ibs. up an inclined plane 20 feet long and 8 feet high ? 



SOLUTION. As 20 : 8 :: 1500 : 600 Ibs. Ans. 



To find the height of an inclined plane wlien its length 

 and base are given. 



RULE. Subtract the square of the base from the square 

 of the length, and the square root of the remainder is the 

 height. 



EXAMPLE. Given an inclined plane, the length of which 

 is 40 feet and base 38 : required, its height ? 



SOLUTION. 1600, square of length, 1444, square of 

 base, = |/ 156 = 12.49 feet. Ans. 



To find the length when its ~base and height are given. 



