Projectile Motion Solved Problem JEE Physics
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JEE 2020 Physics solved problem series
Sai's Classes helping the students who are aiming IIT with a series of Physics problems solving through explanation in details The following video surely help those JEE preparing students . More videos will be uploaded; to get an update subscribe the You Tube channel.
JEE Main Solved Question 2020 Physics
Question 4 : A uniform cylinder of mass 'M' and radius 'R' is to be pulled over a step of height 'a' (a<R) by a force 'F'at it's centre 'O' perpendicular to the plane through the axis of the cylinder on the edge of the step as shown in figure. The minimum value of 'F' required is Answer: Apply the principle of moment about the edge of the step C Sum of clockwise moment=Sum of anticlockwise moment Just before rolling `F× R=Mg×d`---------------(1) (where d=CB from figure) Applying Pythagores theorem in đťš«OBC `R^2=(R-a)^2+d^2` `d=sqrt(R^2-(R-a)^2)` substitute for d in (1) `F=(Mg/R)×R×sqrt(1-((R-a)/R)^2)` `F=Mg×sqrt(1-((R-a)/R)^2)` Watch Video with explanation