question_answer

A rectangular solid box of length 0.3 m is held horizontally, with one of its sides on the edge of a platform of height 5m. When released, it slips off the table in a very short time \[\tau =0.01s,\] remaining essentially horizontal. The angle by which it would rotate when it hits the ground will be (in radians) close to :- [JEE Main 8-4-2019 Afternoon]

A)   0.02               

B)   0.28

C)   0.5                 

D)        0.3

Correct Answer: C

Solution :

[c] Angular impulse = change in angular momentum

time taken by rod to hit the ground

in this time angle rotate by rod

radian