1
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
$${\left( {{{2B} \over A}} \right)^{1/6}}$$, $$ - {{{A^2}} \over {4B}}$$
B
$${\left( {{{2B} \over A}} \right)^{1/6}}, - {{{A^2}} \over {2B}}$$
C
$${\left( {{B \over A}} \right)^{1/6}},0$$
D
$${\left( {{B \over {2A}}} \right)^{1/6}}, - {{{A^2}} \over {2B}}$$
2
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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?
A
5690 J
B
5250 J
C
2780 J
D
3280 J
3
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle is moving unidirectionally on a horizontal plane under the action of a constant power supplying energy source. The displacement (s) - time (t) graph that describes the motion of the particle is (graphs are drawn schematically and are not to scale) :
A
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 80 English Option 1
B
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 80 English Option 2
C
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 80 English Option 3
D
JEE Main 2020 (Online) 3rd September Evening Slot Physics - Work Power & Energy Question 80 English Option 4
4
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Consider a force $$\overrightarrow F = - x\widehat i + y\widehat j$$ . The work done by this force in moving a particle from point A(1, 0) to B(0, 1) along the line segment is : (all quantities are in SI units) JEE Main 2020 (Online) 9th January Morning Slot Physics - Work Power & Energy Question 83 English
A
2
B
$${1 \over 2}$$
C
1
D
$${3 \over 2}$$
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