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A horizontal force F pulls a 20 kg box at a constant speed along a horizontal floor. If the coefficient of sliding friction between the box and floor is 0.25, how much work is done by force F in moving the box through a distance of 20 m?

Chemistry

The degree of dissociation of water was found to be 1.8 x 10^-9 at 25 ^oC. Calculate its ionization constant and ionic product at 25 ^oC.

Mathematics

Multiple Choice Question
A positive integer is chosen at random. The probability that the sum of the digits of its square is 39 is

(a)	1/33	(b)	2/33
(c)	1/11	(d)	zero

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