190J
160J
150J
20J
45
75
20
10
Two particle A and B are connected by a rigid rod AB .The rod slides along perpenticular rails as shown here.The velocity of A to the rigid is 10 m /s .What is the velocity of B when angle a = 600?
9.8 m/s
10 m /s
5.8 m /s
17.3 m /s
A stone tied to the end of a string of 1m long is whiriled in a horizontal circle with a constant speed.If the stone makes 22 revolutions in 44s ,what is the magnitude and direction of acceleration of the stone?
π2/4 ms-2 and direction along the radius towards the centre
π2 ms-2 and direction along the radius away from centre
π2 ms-2 and direction along the radius towards the centre
π2 ms-2 and direction along the tangent to the circle
-1
1/2
-1/2
1
A stone is tied to a string of length l and is whirled in a vertical circle with the other end of the string as the centre.At a certain instant of time,the stone is at its lowest position and has a speed u.The magnitude of the change in velocity as it reaches a position where the string is horizontal (g being acceleration due to gravity) is
directed towards the origin
directed away from the origin
parallel to the position vector
perpenticular to the position vector
For angles of projection of a projectile at angles(450-θ) and (450-θ) ,the horizontal ranges described
by the projectile are in the ratio of
1:1
2:3
1:2
2:1
The speed of a boat is 5 km / h in still water.It crosses a river of width 1.0 km along the shortest possible path in 15 min.The velocity of the river water is in (km / h)
5
3
4
zero
A
zero vector
unit vector
