JEE Main 2021 (Online) 17th March Evening Shift | Center of Mass and Collision Question 47 | Physics

JEE Main 2021 (Online) 17th March Evening Shift

MCQ (Single Correct Answer)

-1

Two identical blocks A and B each of mass m resting on the smooth horizontal floor are connected by a light spring of natural length L and spring constant K. A third block C of mass m moving with a speed v along the line joining A and B collides with A. The maximum compression in the spring is

JEE Main 2021 (Online) 17th March Evening Shift Physics - Center of Mass and Collision Question 48 English

JEE Main 2021 (Online) 17th March Evening Shift Physics - Center of Mass and Collision Question 48 English

$$\sqrt {{{mv} \over K}} $$

$$\sqrt {{m \over {2K}}} $$

$$\sqrt {{{mv} \over {2K}}} $$

$$v\sqrt {{m \over {2K}}} $$

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

A triangular plate is shown. A force $$\overrightarrow F $$ = 4$$\widehat i$$ $$-$$ 3$$\widehat j$$ is applied at point P. The torque at point P with respect to point 'O' and 'Q' are :

JEE Main 2021 (Online) 17th March Morning Shift Physics - Center of Mass and Collision Question 49 English

JEE Main 2021 (Online) 17th March Morning Shift Physics - Center of Mass and Collision Question 49 English

$$-$$ 15 + 20$$\sqrt 3 $$, 15 + 20$$\sqrt 3 $$

15 $$-$$ 20$$\sqrt 3 $$, 15 + 20$$\sqrt 3 $$

15 + 20$$\sqrt 3 $$, 15 $$-$$ 20$$\sqrt 3 $$

$$-$$ 15 $$-$$ 20$$\sqrt 3 $$, 15 $$-$$ 20$$\sqrt 3 $$

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

A large block of wood of mass M = 5.99 kg is hanging from two long massless cords. A bullet of mass m = 10 g is fired into the block and gets embedded in it. The (block + bullet) then swing upwards, their centre of mass rising a vertical distance h = 9.8 cm before the (block + bullet) pendulum comes momentarily to rest at the end of its arc. The speed of the bullet just before collision is :
(take g = 9.8 ms^-2)

JEE Main 2021 (Online) 16th March Evening Shift Physics - Center of Mass and Collision Question 50 English

JEE Main 2021 (Online) 16th March Evening Shift Physics - Center of Mass and Collision Question 50 English

831.4 m/s

811.4 m/s

841.4 m/s

821.4 m/s

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

Four equal masses, m each are placed at the comers of a square of length (l) as shown in the figure. The moment of inertia of the system about an axis passing through A and parallel to DB would be :

JEE Main 2021 (Online) 16th March Morning Shift Physics - Center of Mass and Collision Question 52 English