MyGoalPrep LogoMyGoalPrep.com

MechanicsHard JEE physics MCQ

A uniform wooden stick of mass $1.6 \mathrm{~kg}$ and length $l$ rests in an inclined manner on a smooth, vertical wall of height $h(<l)$ such that a small portion of the stick extends beyond the wall. The reaction force of the wall on the stick is perpendicular to the stick. The stick makes an angle of $30^{\circ}$ with the wall and the bottom of the stick is on a rough floor. The reaction of the wall on the stick is equal in magnitude to the reaction of the floor on the stick. The ratio $h / l$ and the frictional force $f$ at the bottom of the stick are $\left(g=10 \mathrm{~ms} \mathrm{~s}^{2}\right)$
  1. A. $\frac{h}{l}=\frac{\sqrt{3}}{16}, f=\frac{16 \sqrt{3}}{3} \mathrm{~N}$
  2. B. $\frac{h}{l}=\frac{3}{16}, f=\frac{16 \sqrt{3}}{3} \mathrm{~N}$
  3. C. $\frac{h}{l}=\frac{3 \sqrt{3}}{16}, f=\frac{8 \sqrt{3}}{3} \mathrm{~N}$
  4. D. $\frac{h}{l}=\frac{3 \sqrt{3}}{16}, f=\frac{16 \sqrt{3}}{3} \mathrm{~N}$

Solution

The correct option is **D**.

PHYSICS

hardPYQ Reworded
Question
Read carefully, then pick the best option.
A uniform wooden stick of mass 1.6 kg1.6 \mathrm{~kg} and length ll rests in an inclined manner on a smooth, vertical wall of height h(<l)h(<l) such that a small portion of the stick extends beyond the wall. The reaction force of the wall on the stick is perpendicular to the stick. The stick makes an angle of 3030^{\circ} with the wall and the bottom of the stick is on a rough floor. The reaction of the wall on the stick is equal in magnitude to the reaction of the floor on the stick. The ratio h/lh / l and the frictional force ff at the bottom of the stick are (g=10 ms s2)\left(g=10 \mathrm{~ms} \mathrm{~s}^{2}\right)
AI hints
Ask for a nudge. Keep it specific.
Mechanics — Hard JEE Physics MCQ | MyGoalPrep