Mechanics> broad-elevator...

The answer to each of the questions is a single digit integer ranging from 0 to 9.A very broad elevator is going up vertically with a constant acceleration of 2 m/s2. At the instant when its velocity is 4 m/s a ball is projected from the floor of the lift with a speed of 4 m/s relative to the floor at an elevation of 30o. The time taken by the ball to return the floor is second. Find x. (g = 10 m/s2)

Amit Saxena , 11 Years ago

Grade upto college level

4 Answers

Simran Bhatia

Last Activity: 11 Years ago

3

   Components of velocity of ball relative to lift are

       ux = 4 cos 30o = 2√3 m/s

   and   uy = 4 sin 30o = 2 m/s

       T = (2u_y)/12=u_y/6=2/6=1/3 s

       x = 3

Aditi Bardhan

Last Activity: 6 Years ago

Total acceleration=g+ 2m/s=12 m/sTherefore time of flight=(2usinΦ)/g=(2*4*1/2)/12 =1/3 s. Given [u=4m/s ; sin30=1/2]Hope this helps.... If you have any problem regarding this... Post it here.....

Gitanjali Rout

Last Activity: 6 Years ago

A very broad elevator is going up vertically with a constant acceleration of 2 m/s². At the instant when its velocity is 4 m/s a ball is projected from the floor of the lift with a speed of 4 m/s relative to the floor at an elevation of 30^o. The time taken by the ball to return the floor is

second. Find x. (g = 10 m/s²)

Gitanjali Rout

Last Activity: 6 Years ago

otal acceleration=g+ 2m/s=12 m/sTherefore time of flight=(2usinΦ)/g=(2*4*1/2)/12 =1/3 s. Given [u=4m/s ; sin30=1/2]Hope this helps.... If you have any problem regarding this... Post it here.....nbk