Yes that would be correct. But if its an essay I'd be a bit more elaborate and give examples.
The concept of work-energy theorem has become much of a fundamental principle in the field of physics, mechanics, and engineering. In addition, this theory primarily states that the change of kinetic energy of the system is equal to the sum of the work done that is acted by all forces on the object.
Answer:
Explanation:
a )
Time period T = 1/3 s
angular velocity = 2π / T
= 2 x 3.14 x 3
ω = 18.84 radian / s
b )
Applying conservation of angular momentum
I₁ ω₁ = I₂ ω₂
I₁ / I₂ = ω₂ / ω₁
2 = ω₂ / ω
ω₂ = 2 ω
c )
(KE)initial = 1/2 I₁ ω²
(KE)final = 1/2 I₂ ω₂²
= 1/2 (I₁ / 2) (2ω)²
= I₁ ω²
c )
Change in rotational kinetic energy
= I₁ ω² - 1/2 I₁ ω²
= + 1/2 I₁ ω²
d )
This energy comes from the work done by centripetal force which is increased to increase the speed of rotation.
