CBSE 11th Standard Physics Subject Motion in a Straight Line Ncert Exemplar 5 Mark Questions 2021
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CBSE 11th Standard Physics Subject Motion in a Straight Line Ncert Exemplar 5 Mark Questions 2021
11th Standard CBSE
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Reg.No. :
Physics
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It is a common observation that rain clouds can be at about a kilometre altitude above the ground.
(a) If a rain drop falls from such a height freely under gravity, what will be its speed?Also, calculate in km/h (g = 10 m/s2).
(b) A typical rain drop is about 4 mm diameter.Momentum is mass x speed in magnitude.Estimate its momentum when it hits ground.
(c) Estimate time required to flatten the drop.
(d) Rate of change of momentum is force.Estimate how much force such a drop would exert on you?
(e) Estimate the order of magnitude force on umbrella. Typical lateral separation between two rain drops is 5cm.(a)