Covering with black paper strips should be tested for presence of a. O2 in leaf b. Starch in leaf c. Water in leaf d. CO2 inleaf
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A man raises a box of mass 50 kg to a height
of 2 m in 20 s, while another man raises the same
box to the same height in 50 s.
(a) Compare : (i) the work done, and (ii) the power
developed by them.
(b) Calculate : (i) the work done, and (ii) the power
developed by each man. Take g = 10 N kg-
Ans. (a) (i) 1:1 (ii) 5:2.
(b) (i) 1000 J, 1000 J (ii) 50 W, 20 W
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