When a body moves with a constant speed along a circle
Its velocity remains constant
No force act on it
No work is done on it
No acceleration is produced in it
Which of the following is not a vector quantity ?
speed
Velocity
Torque
Displacement
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 bullet is fired a gun with a speed of 1000 m/s in order to hit a target 100 m away.At what height above the target should the gun be aimed ? (The resistance of air is negligible and g=10 m /s2)
5 cm
10 cm
15 cm
20 cm
00
450
900
1800
cos-1 (0.6)
A boat is sent across a river with a velocity of 8km-1.If the resultant velecity of boat is 10kmh-1,then velocity of river is
12.8kmh-1
6kmh-1
8kmh-1
10kmh-1
600
300
P is the point of contact of a wheel and the ground .The radius of wheel is 1m .The wheel rolls on the ground without slipping .The displacement of point p when wheel completes half rotation is
2m
πm
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
