1
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
9.859 $$\times$$ 10$$-$$2 N
B
0.0314 N
C
9.859 $$\times$$ 10$$-$$4 N
D
6.28 $$\times$$ 10$$-$$3 N
2
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle is moving with uniform speed along the circumference of a circle of radius R under the action of a central fictitious force F which is inversely proportional to R3. Its time period of revolution will be given by :
A
$$T \propto {R^{{4 \over 3}}}$$
B
$$T \propto {R^{{5 \over 2}}}$$
C
$$T \propto {R^{{3 \over 2}}}$$
D
$$T \propto {R^2}$$
3
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A clock has a continuously moving second's hand of 0.1 m length. The average acceleration of the tip of the hand (in units of ms–2) is of the order of :
A
10-3
B
10-1
C
10-2
D
10-4
4
JEE Main 2020 (Online) 2nd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A bead of mass m stays at point P(a, b) on a wire bent in the shape of a parabola y = 4Cx2 and rotating with angular speed $$\omega $$ (see figure). The value of $$\omega $$ is (neglect friction) : JEE Main 2020 (Online) 2nd September Morning Slot Physics - Circular Motion Question 45 English
A
$$2\sqrt {2gC} $$
B
$$2\sqrt {gC} $$
C
$$\sqrt {{{2gC} \over {ab}}} $$
D
$$\sqrt {{{2g} \over C}} $$
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