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Quantity I: Rate downstream = 20/4 = 5 kmph Rate upstream = 20/5 = 4 kmph Speed of boat in still water = 1/2 × (4+5) = 4.5 kmph Quantity II: Speed in still water = 48/3 = 16 kmph Speed of current = 4 kmph Time taken to cover distance upstream = 48/(16-4) = 4 hr Difference in time = 4 – 3 = 1 hr Therefore, Quantity I > Quantity II
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Cryogenics is a branch of Physics that deals with what?
The direction of magnetic field inside a magnet is
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