If a ball is thrown upwards from the earth surface:
A ping-pong ball of mass 'm' is floating in air by a jet of water emerging out of a nozzle. if the water strikes ping pong ball with a speed v and just after collision water falls dead, the mass flow rate of water in nozzle is equal to:
In a system of four unequal particles located in an arrangement of non-linear, coplanar system, the centre of mass:::
a bal is projected with a velocity of 20*1.414 m/s at an angle of 45 with horizontal and at the same instant another plate is rotating with constant angular velocity 'w'(w=22/28 rad/sec) in vertical plane. If the mass of the plate is much larger than the mass of the ball, the plate is initially in horizontal position and collision is perfectly elastic, then choose the correct options:::
A) Time when the ball collides with the plate is 2 seconds
B) Velocity of the ball just after collision with the plate is 10(2+22/7) m/s
C) Position of ball when it collides again on the ground surface from projection point is 20*3.14m
D)Max height attained by the ball is 20m
A force of 200N on a body causes it to acquire a momentum of 100kg m/s. Find the time period for the action of the force.
Two shells are fired from a cannon, with equal speed 'u', at angles 'a' and 'b' with the horizontal, the time period between th shots being 'T'. They colide in mid-air after time 't' from the first shot. Which of the following conditions must be satisfied ?:::
A) a>b
B) t cos a = (t-T)cos b
C) (t-T)cos a = t cos b
D) (u sin a)t - 1/2g(t*t) = (u sin b)(t-T) - (1/2)g(t-T)(t-T)