A man of 60 kg carries a mass of 30 kg and climbs up an inclined hill. He moves 80 meter height in 5 minutes. Calculate the following:
(a) Work done by the child
(b) Power of the child (use g = 10 m/s2

Aresearcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (tmv). the cell contents are left in a covered test tube overnight. the next day this mixture is sprayed on tobacco plants. we expect that the plants would ) develop some but not all of the symptoms of the tmv infectionb) develop the typical symptoms of tmv infectionc) not show any disease symptomsd) become infected, but the sap from these plants would be unable to infect other plants