Questions
The aeroplane of mass M requires a speed v for take-off. The length of the run-way is s and the coefficient of friction between the tyres and ground is µ. Assuming that the plane accelerates
detailed solution
Correct option is B
The acceleration a required to impart a speed v in a distance s is given byv2−u2=2as or v2=2as (∵u=0) or a=v2/2sThe force F1 needed to produce this acceleration isF1=M×a=Mv2/2sThe force F2 needed to overcome the friction isF2=μMg∴ Total force needed=F1+F2 =M(v22s+μg)Talk to our academic expert!
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Statement I : The familiar equation mg = R for a body on a table is true only if the body is in equilibrium.
Statement II : The equality of mg and R has no connection with the third law.
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