A boy stands over the centre of a horizontal platform which is rotating freely with a speed of 
about a vertical axis through the centre of the platform and straight up through the boy. He holds 
masses in each of his hands close to his body. The combined moment of inertia of the system is 
. The boy now stretches his arms so as to hold the masses of inertia of the system increases to 
. The kinetic energy of the system in the latter case as compared with that in the previous case will
a)
Remains unchanged
b)
Decrease
c)
Increase
d)
Remains uncertain
A boy stands over the centre of a horizontal platform which is rotating freely with a speed of about a vertical axis through the centre of the platform and straight up through the boy. He holds masses in each of his hands close to his body. The combined moment of inertia of the system is . The boy now stretches his arms so as to hold the masses of inertia of the system increases to . The kinetic energy of the system in the latter case as compared with that in the previous case will
a)
Remains unchanged
b)
Decrease
c)
Increase
d)
Remains uncertain
Question ID - 53907 | SaraNextGen Top Answer
A boy stands over the centre of a horizontal platform which is rotating freely with a speed of about a vertical axis through the centre of the platform and straight up through the boy. He holds masses in each of his hands close to his body. The combined moment of inertia of the system is . The boy now stretches his arms so as to hold the masses of inertia of the system increases to . The kinetic energy of the system in the latter case as compared with that in the previous case will
a)
Remains unchanged
b)
Decrease
c)
Increase
d)
Remains uncertain
|
A boy stands over the centre of a horizontal platform which is rotating freely with a speed of |
|||||||
|
a) |
Remains unchanged |
b) |
Decrease |
c) |
Increase |
d) |
Remains uncertain |
|
(b)
|
. If boy stretches his arm then moment of inertia increases and accordingly kinetic energy of the system decreases because 
constant and 