JEE Main 2022 (Online) 24th June Morning Shift | Work Power & Energy Question 55 | Physics

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

A particle experiences a variable force $$\overrightarrow F = \left( {4x\widehat i + 3{y^2}\widehat j} \right)$$ in a horizontal x-y plane. Assume distance in meters and force is newton. If the particle moves from point (1, 2) to point (2, 3) in the x-y plane, then Kinetic Energy changes by :

50.0 J

12.5 J

25.0 J

0 J

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

A body of mass 'm' dropped from a height 'h' reaches the ground with a speed of 0.8$$\sqrt {gh} $$. The value of workdone by the air-friction is :

$$-$$0.68 mgh

mgh

1.64 mgh

0.64 mgh

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

-1

A block moving horizontally on a smooth surface with a speed of 40 m/s splits into two parts with masses in the ratio of 1 : 2. If the smaller part moves at 60 m/s in the same direction, then the fractional change in kinetic energy is :-

$${{1 \over 3}}$$

$${{2 \over 3}}$$

$${{1 \over 8}}$$

$${{1 \over 4}}$$

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

-1

Given below is the plot of a potential energy function U(x) for a system, in which a particle is in one dimensional motion, while a conservative force F(x) acts on it. Suppose that E_mech = 8 J, the incorrect statement for this system is :

JEE Main 2021 (Online) 27th July Evening Shift Physics - Work Power & Energy Question 64 English

JEE Main 2021 (Online) 27th July Evening Shift Physics - Work Power & Energy Question 64 English

[ where K.E. = kinetic energy ]

at x > x₄ K.E. is constant throughout the region.

at x < x₁, K.E. is smallest and the particle is moving at the slowest speed.

at x = x₂, K.E. is greatest and the particle is moving at the fastest speed.

at x = x₃, K.E. = 4 J.

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