A bus is moving on a straight road towards north with a uniform speed of 50 km/h .If the speed remains unchanged after turning through 900,the increase in the velocity of bus in the turning process is
70.7 km/h along south - west direction.
zero
50 km/h along west
70.7 km/h along north- west direction
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
zero vector
unit vector
directed towards the origin
directed away from the origin
parallel to the position vector
perpenticular to the position vector
An electric fan has blades of length 30 cm measured from the axis of rotation .If the fan is rotating at 120 rev / min ,the accelaration of a point on the tip of the blade is
1600ms-2
47.4 ms-2
23.7 ms-2
50.55 ms-2
190J
160J
150J
20J
A+B
(A2+B2+√3 AB)1/2
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
A particle moves along a circle of radius (20/π)m with constant tangential accelaration.If the velocity of the particle is 80 m/ s at the end of the second revolution after motion has begun,the tangential accelaration is
160 π m/ s2
40 m / s
40 π m/ s2
640 π m/ s2
-1
1/2
-1/2
1
