JEE Main 2021 (Online) 18th March Morning Shift | Work Power & Energy Question 44 | 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 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-1

If two similar springs each of spring constant K₁ are joined in series, the new spring constant and time period would be changed by a factor :

$${1 \over 2},2\sqrt 2 $$

$${1 \over 4},2\sqrt 2 $$

$${1 \over 2},\sqrt 2 $$

$${1 \over 4},\sqrt 2 $$

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 :

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

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

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

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

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