A car of mass $m$ when passes over top of convex bridge of radius of curvature $r,$ with a velocity $v,$ then the normal force exerted by the bridge on the car is
A car of mass $m$ when passes over top of convex bridge of radius of curvature $r,$ with a velocity $v,$ then the normal force exerted by the bridge on the car is
- A
Zero
- B
$mg$
- C
$mg + \frac{{m{v^2}}}{r}$
- D
$mg - \frac{{m{v^2}}}{r}$
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- [JEE MAIN 2022]
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Give the magnitude and direction of the net force acting on a stone of mass $0.1\; kg$,
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$(b)$ just after it is dropped from the window of a train running at a constant velocity of $36 \;km/h$,
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Neglect air resistance throughout.
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$(a)$ just after it is dropped from the window of a stationary train,
$(b)$ just after it is dropped from the window of a train running at a constant velocity of $36 \;km/h$,
$(c)$ just after it is dropped from the window of a train accelerating with $1\; m s^{-2}$,
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Neglect air resistance throughout.
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