WB JEE 2022 | Laws of Motion Question 10 | Physics

If a string, suspended from the ceiling is given a downward force F₁, its length becomes L₁. Its length is L₂, if the downward force is F₂. What is its actual length?

$${{{L_1} + {L_2}} \over 2}$$

$$\sqrt {{L_1}{L_2}} $$

$${{{F_2}{L_1} + {F_1}{L_2}} \over {{F_2} + {F_1}}}$$

$${{{F_2}{L_1} - {F_1}{L_2}} \over {{F_2} - {F_1}}}$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.5

A golf ball of mass 50 gm placed on a tee, is struck by a golf-club. The speed of the golf ball as it leaves the tee is 100 m/s, the time of contact on the ball is 0.02 s. If the force decreases to zero linearly with time, then the force at the beginning of the contact is

100 N

200 N

250 N

500 N

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

WB JEE 2021 Physics - Laws of Motion Question 12 English

Three blocks are pushed with a force F across a frictionless table as shown in figure above. Let N₁ be the contact force between the left two blocks and N₂ be the contact force between the right two blocks. Then,

F > N₁ > N₂

F > N₂ > N₁

F > N₁ = N₂

F = N₁ = N₂

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

A block of mass m rests on a horizontal table with a coefficient of static friction $$\mu $$. What minimum force must be applied on the block to drag it on the table?

$${\mu \over {\sqrt {1 + {\mu ^2}} }}$$ mg

$${{\mu - 1} \over {\mu + 1}}$$ mg

$${\mu \over {\sqrt {1 - {\mu ^2}} }}$$ mg

$$\mu $$ mg

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