1
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The time taken by an object to slide down 45$$^\circ$$ rough inclined plane is n times as it takes to slide down a perfectly smooth 45$$^\circ$$ incline plane. The coefficient of kinetic friction between the object and the incline plane is :

A
$$1 - {1 \over {{n^2}}}$$
B
$$1 + {1 \over {{n^2}}}$$
C
$$\sqrt {1 - {1 \over {{n^2}}}} $$
D
$$\sqrt {{1 \over {1 - {n^2}}}} $$
2
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A block of mass $m$ slides down the plane inclined at angle $$30^{\circ}$$ with an acceleration $$\frac{g}{4}$$. The value of coefficient of kinetic friction will be:

A
$$\frac{2 \sqrt{3}-1}{2}$$
B
$$\frac{\sqrt{3}}{2}$$
C
$$\frac{1}{2 \sqrt{3}}$$
D
$$\frac{2 \sqrt{3}+1}{2}$$
3
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Consider a block kept on an inclined plane (incline at 45$$^\circ$$) as shown in the figure. If the force required to just push it up the incline is 2 times the force required to just prevent it from sliding down, the coefficient of friction between the block and inclined plane($$\mu$$) is equal to :

JEE Main 2023 (Online) 25th January Evening Shift Physics - Laws of Motion Question 38 English

A
0.60
B
0.33
C
0.25
D
0.50
4
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

As per given figure, a weightless pulley P is attached on a double inclined frictionless surfaces. The tension in the string (massless) will be (if g = 10 m/s$$^2$$)

JEE Main 2023 (Online) 24th January Morning Shift Physics - Laws of Motion Question 37 English

A
$$\left( {4\sqrt 3 - 1} \right)N$$
B
$$\left( {4\sqrt 3 + 1} \right)N$$
C
$$4\left( {\sqrt 3 - 1} \right)N$$
D
$$4\left( {\sqrt 3 + 1} \right)N$$
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