1
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
A body is projected at t = 0 with a velocity 10 ms–1 at an angle of 60o with the horizontal. The radius of curvature of its trajectory at t = 1s is R. neglecting air resistance and taking acceleration due to gravity g = 10 ms–2, the value of R is :
A
2.8 m
B
5.1 m
C
2.5 m
D
10.3 m
2
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
A disc rotates about its axis of symmetry in a horizontal plane at a steady rate of $$3.5$$ revolutions per second. A coin placed at a distnce of 1.25 cm from the axis of rotation remains at rest on the disc. The coefficient of friction between the coin and the disc is : (g = 10 m/s2)
A
0.5
B
0.3
C
0.7
D
0.6
3
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
A conical pendulum of length 1 m makes an angle $$\theta$$ = 45o w.r.t. Z-axis and moves in a circle in the XY plane. The radius of the circle is 0.4 m and its center is vertically below O. The speed of the pendulum, in its circular path, will be: (Take g = 10 ms−2 )

A
0.4 m/s
B
4 m/s
C
0.2 m/s
D
2 m/s
4
AIEEE 2012
+4
-1
Two cars of masses m1 and m2 are moving in circles of radii r1 and r2, respectively. Their speeds are such that they make complete circles in the same time t. The ratio of their centripetal acceleration is
A
m1r1 : m2r2
B
m1 : m2
C
r1 : r2
D
1 : 1
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