1
JEE Main 2020 (Online) 7th January Morning Slot
+4
-1
A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg. If the frictional force on the elevator is 4000 N, the speed of the elevator at full load is close to :
(1 HP = 746 W, g = 10 ms-2)
A
1.5 ms-1
B
1.7 ms-1
C
2.0 ms-1
D
1.9 ms-1
2
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
A uniform cable of mass 'M' and length 'L' is placed on a horizontal surface such that its (1/n)th part is hanging below the edge of the surface. To lift the hanging part of the cable upto the surface, the work done should be :
A
$${{2MgL} \over {{n^2}}}$$
B
nMgL
C
$${{MgL} \over {2{n^2}}}$$
D
$${{MgL} \over {{n^2}}}$$
3
JEE Main 2019 (Online) 8th April Morning Slot
+4
-1
A particle moves in one dimension from rest under the influence of a force that varies with the distance travelled by the particle as shown in the figure. The kinetic energy of the particle after it has travelled 3m is :
A
6.5 J
B
2.5 J
C
5 J
D
4 J
4
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
A particle which is experiencing a force, given by $$\overrightarrow F = 3\widehat i - 12\widehat j,$$ undergoes a displacement of $$\overrightarrow d = 4\overrightarrow i$$ particle had a kinetic energy of 3 J at the beginning of the displacement, what is its kinetic energy at the end of the displacement ?
A
9 J
B
10 J
C
12 J
D
15 J
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