Answer:
t= 0.75 s
Explanation:
Here given that there is no any external torque that is why it angular momentum will be conserve.
Initial angular momentum= m V₁ r₁
Final angular momentum= m V₂ r₂
So
m V₁ r₁ = m V₂ r₂
Now by putting the values
m V₁ r₁ = m V₂ r₂
V₁ r₁ = V₂ r₂
6 x 3 = 12 x r₂
r₂ = 1.5 ft
So the time t
t = r₂ / Vr
t= 1.5 / 2
t= 0.75 s
Answer:
150kW
Explanation:
Energy date of air when it enters= 100kW
Energy rate of air when it leaves= 250kW
Energy rate gained by air= energy rate lost by sytem= 250-100
= 150kW
Answer
C
Why
I took the quiz