JEE Main 2021 (Online) 18th March Morning Shift | Work Power & Energy Question 87 | Physics

A constant power delivering machine has towed a box, which was initially at rest, along a horizontal straight line. The distance moved by the box in time 't' is proportional to :-

t^2/3

t^3/2

t^1/2

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

A boy is rolling a 0.5 kg ball on the frictionless floor with the speed of 20 ms^-1. The ball gets deflected by an obstacle on the way. After deflection it moves with 5% of its initial kinetic energy. What is the speed of the ball now?

14.41 ms^$$-$$1

19.0 ms^$$-$$1

4.47 ms^$$-$$1

1.00 ms^$$-$$1

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

If the potential energy between two molecules is given by
U = $$ - {A \over {{r^6}}} + {B \over {{r^{12}}}}$$,
then at equilibrium, separation between molecules, and the potential energy are :

$${\left( {{{2B} \over A}} \right)^{1/6}}$$, $$ - {{{A^2}} \over {4B}}$$

$${\left( {{{2B} \over A}} \right)^{1/6}}, - {{{A^2}} \over {2B}}$$

$${\left( {{B \over A}} \right)^{1/6}},0$$

$${\left( {{B \over {2A}}} \right)^{1/6}}, - {{{A^2}} \over {2B}}$$

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

-1

A person pushes a box on a rough horizontal plateform surface. He applies a force of 200 N over a distance of 15 m. Thereafter, he gets progressively tired and his applied force reduces linearly with distance to 100 N. The total distance through which the box has been moved is 30 m. What is the work done by the person during the total movement of the box?

5690 J

5250 J

2780 J

3280 J

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