JEE Main 2021 (Online) 18th March Morning Shift | Rotational Motion Question 49 | Physics

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

A thin circular ring of mass M and radius r is rotating about its axis with an angular speed $$\omega$$. Two particles having mass m each are now attached at diametrically opposite points. The angular speed of the ring will become :

$$\omega {M \over {M + m}}$$

$$\omega {{M + 2m} \over M}$$

$$\omega {M \over {M + 2m}}$$

$$\omega {{M - 2m} \over {M + 2m}}$$

JEE Main 2021 (Online) 17th March Evening Shift

MCQ (Single Correct Answer)

-1

A sphere of mass 2 kg and radius 0.5 m is rolling with an initial speed of 1 ms^-1 goes up an inclined plane which makes an angle of 30$$^\circ$$ with the horizontal plane, without slipping. How long will the sphere take to return to the starting point A?

JEE Main 2021 (Online) 17th March Evening Shift Physics - Rotational Motion Question 50 English

JEE Main 2021 (Online) 17th March Evening Shift Physics - Rotational Motion Question 50 English

0.60 s

0.52 s

0.80 s

0.57 s

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

A mass M hangs on a massless rod of length l which rotates at a constant angular frequency. The mass M moves with steady speed in a circular path of constant radius. Assume that the system is in steady circular motion with constant angular velocity $$\omega$$. The angular momentum of M about point A is L_A which lies in the positive z direction and the angular momentum of M about point B is L_B. The correct statement for this system is :

JEE Main 2021 (Online) 17th March Morning Shift Physics - Rotational Motion Question 53 English

JEE Main 2021 (Online) 17th March Morning Shift Physics - Rotational Motion Question 53 English

L_A is constant, both in magnitude and direction

L_B is constant in direction with varying magnitude

L_B is constant, both in magnitude and direction

L_A and L_B are both constant in magnitude and direction

JEE Main 2021 (Online) 16th March Morning Shift

MCQ (Single Correct Answer)

-1

A block of 200 g mass moves with a uniform speed in a horizontal circular groove, with vertical side walls of radius 20 cm. If the block takes 40 s to complete one round, the normal force by the side walls of the groove is :

9.859 $$\times$$ 10^$$-$$2 N

0.0314 N

9.859 $$\times$$ 10^$$-$$4 N

6.28 $$\times$$ 10^$$-$$3 N

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