Physics || JEE Main previous year questions with Solutions

0

072920 77839
info@smartachievers.in

Topic Question Set

Q 1 :
A heavy iron bar, of weight W is having its one end on the ground and the other on the shoulder of a person. The bar makes an angle θ with the horizontal. The weight experienced by the person is _____. [2024]

$\frac{W}{2}$
$W$
$W$ $\cos$ $θ$
$W$ $\sin$ $θ$

1

2

3

4

(1)

$N_{B} = net reaction force by shoulder.$

Balancing torque about point of contact $(A)$ on ground:

$W (\frac{L}{2} \cos θ) = N_{B} (L \cos θ)$

$\Rightarrow N_{B} = \frac{W}{2}$

Q 2 :
A heavy iron bar of weight 12 kg is having its one end on the ground and the other on the shoulder of a man. The rod makes an angle 60° with the horizontal, the weight experienced by the man is _____. [2024]

6 kg
12 kg
3 kg
$6 \sqrt{3}$ kg

1

2

3

4

(3)

$Torque about O = 0$

$120 (\frac{L}{2} \cos 60 °) - N_{2} L = 0$

$N_{2} = 30 N$

Want Us to Email you About Special Offers & Updates?