JEE Main 2020 (Online) 3rd September Evening Slot | Work Power & Energy Question 57 | Physics

JEE Main 2020 (Online) 3rd September Evening Slot

Numerical

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A block starts moving up an inclined plane of inclination 30^o with an initial velocity of v₀ . It comes back to its initial position with velocity $${{{v_0}} \over 2}$$. The value of the coefficient of kinetic friction between the block and the inclined plane is close to $${I \over {1000}}$$. The nearest integer to I is____.

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JEE Main 2020 (Online) 3rd September Morning Slot

Numerical

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A cricket ball of mass 0.15 kg is thrown vertically up by a bowling machine so that it rises to a maximum height of 20 m after leaving the machine. If the part pushing the ball applies a constant force F on the ball and moves horizontally a distance of 0.2 m while launching the ball, the value of F (in N) is (g = 10 ms^–2) ____.

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JEE Main 2020 (Online) 2nd September Morning Slot

Numerical

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JEE Main 2020 (Online) 2nd September Morning Slot Physics - Work Power & Energy Question 59 English

A small block starts slipping down from a point B on an inclined plane AB, which is making an angle $$\theta $$ with the horizontal section BC is smooth and the remaining section CA is rough with a coefficient of friction $$\mu $$. It is found that the block comes to rest as it reaches the bottom (point A) of the inclined plane. If BC = 2AC, the coefficient of friction is given by $$\mu $$ = ktan $$\theta $$ . The value of k is _________.

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JEE Main 2020 (Online) 8th January Morning Slot

Numerical

-0

A body A, of mass m = 0.1 kg has an initial velocity of 3$$\widehat i$$ ms^-1 . It collides elastically with another body, B of the same mass which has an initial velocity of 5$$\widehat j$$ ms^-1. After collision, A moves with a velocity $$\overrightarrow v = 4\left( {\widehat i + \widehat j} \right)$$. The energy of B after collision is written as $${x \over {10}}$$. The value of x is ___________.

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