In the given diagram shown for a projectile, what is the angle of projection?
1.
2.
3.
4.
A body is executing uniform circular motion in a circle of radius 100 m at speed 10 m/s. Acceleration of the body is :
(1) Zero
(2) 2
(3) 1
(4) 5
A particle started revolving from rest with a constant angular acceleration in a circular path of radius r. If centripetal acceleration becomes numerically equal to tangential acceleration at time t, then t is equal to:
1.
2.
3.
4.
Balls A and B are thrown simultaneously from two points lying on the same horizontal plane separated by a distance 120 m. Path of A w.rt. B is
(1) Parabola
(2) Hyperbola
(3) Circle
(4) Straight line
Which of the following is the angle between velocity and acceleration of a body in uniform circular motion?
1. \(30^\circ\)
2. \(45^\circ\)
3. \(60^\circ\)
4. \(90^\circ\)
A man wants to cross a river of width 500 m in the minimum distance. The rowing speed of man relative to water is 3 km/h and river flows with speed 2 km/h. The time taken by the man to cross the river
(1) 2 minute
(2) 6 minute
(3) 2 minute
(4) 6 minute
A person is rotating in a horizontal circle of radius 7 m. Find the period of rotation for which the acceleration is equal to 3g.
(1) 2.6 s
(2) 2.8 s
(3) 3.1 s
(4) 4.3 s
A man can row a boat with a speed of 10 kmph in still water. The river flows at 6 kmph. If he crosses the river from one bank to the other along the shortest possible path, time taken to cross the river of width 1 km is:
1. 1/8 h
2. 1/4 h
3. 1/2 h
4. 1 h
A bus is going to the North at a speed of 30 kmph. It makes a 90° left turn without changing the speed. The change in the velocity of the bus is:
1. | 30 kmph towards W |
2. | 30 kmph towards S-W |
3. | 42.4 kmph towards S-W |
4. | 42.4 kmph towards N-W |
Two bullets are fired simultaneously horizontally and at different speeds from the same place. Which bullet will hit the ground first? (Air resistance is neglected)
1. | The faster one |
2. | The slower one |
3. | Depends on masses |
4. | Both will reach simultaneously |