1
JEE Main 2018 (Offline)
+4
-1
A particle is moving in a circular path of radius $$a$$ under the action of an attractive potential $$U = - {k \over {2{r^2}}}$$ Its total energy is:
A
$$- {3 \over 2}{k \over {{a^2}}}$$
B
Zero
C
$$- {k \over {4{a^2}}}$$
D
$${k \over {2{a^2}}}$$
2
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
An object is dropped from a height h from the ground. Every time it hits the ground it looses 50% of its kinetic energy. The total distance covered as t $$\to$$ $$\infty$$ is :
A
3h
B
$$\infty$$
C
$${5 \over 3}$$h
D
$${8 \over 3}$$h
3
JEE Main 2017 (Offline)
+4
-1
A body of mass m = 10–2 kg is moving in a medium and experiences a frictional force F = –kv2. Its initial speed is v0 = 10 ms–1. If, after 10 s, its energy is $${1 \over 8}mv_0^2$$, the value of k will be:
A
10-1 kg m-1 s-1
B
10-3 kg m-1
C
10-3 kg s-1
D
10-4 kg m-1
4
JEE Main 2017 (Offline)
+4
-1
A time dependent force F = 6t acts on a particle of mass 1 kg. If the particle starts from rest, the work done by the force during the first 1 sec. will be:
A
18 J
B
4.5 J
C
22 J
D
9 J
EXAM MAP
Medical
NEET