Compared to an ideal projectile motion under gravity, which of the following is incorrect regarding another projectile motion in which air friction is also considered?
1. | The time of flight decreases. |
2. | Decrease in the horizontal component of velocity continuously. |
3. | The angle with horizontal is less at the time of striking the ground compared to the angle of projection with horizontal. |
4. | The angle with the vertical is less at the time of striking the ground with respect to the angle of projection with vertical. |
Two balls are projected to acquire same range with the same initial speed u but at different angles of projection. If maximum height acquired by balls are , then () is: (angle of projection of one projectile is )
(1)
(2)
(3)
(4) tan
At the highest point of trajectory in the ground to the ground projectile, the angle between gravitational acceleration and momentum is
(1) 30°
(2) 45°
(3) 90°
(4) Data insufficient
A particle revolves in a horizontal circle with decreasing velocity. The angle between instantaneous velocity and instantaneous acceleration of the particle at an instant is
(1) < 90°
(2) > 90°
(3) = 90°
(4) 90°
Two projectiles are thrown horizontally from a high cliff in the opposite direction with the same speed 20 m/ s simultaneously. At what time velocities of both particles become perpendicular?
(1) 2 s
(2) 2 s
(3) 4 s
(4) 4 s
The equation of the trajectory of a projectile is given as . The range of the projectile is:
(1) 1 m
(2) 32 m
(3) 16 m
(4) 48 m
A cannon can give a maximum speed of 70 m/s to bombs. The maximum distance up to which cannon projects a bomb is (g = 10 m/)
(1) 490 m
(2) 245 m
(3) 100 m
(4) 300 m
A man is running horizontally at a velocity of 6 m/s while rain is falling vertically at 6 m/s. The rain strikes the man with a speed of
(1) 6 m/s
(2) 3 m/s
(3) 6 m/s
(4) 18 m/s
A man wants to cross a river 600 m wide flowing at 8 m/s in the shortest time. Man has a speed of 6 m/ s in still water. What is the path length covered by the man in the river?
1. Infinite
2. 1 km
3. 100 m
4. 1000 cm