Answer:
b
Explanation:
i just answered it and the correct answer is b
That would be 110/22, which is 5 hours
Potential energy = mgh
Energy, U = 400J
g = 10m/s^2
m = A kg
h = U ÷ mg
= 400÷10A
= 40÷A
mass is not given
<span>B. Controls: The known powders attributes are already studied, so the are used as control measures to compare with the findings in the experiment with the unknown powders.</span>
Answer:
m=4.03 kg
Explanation:
Given that
r= 1.2 m
I=24 kg.m²
N₁ = 40 rpm


ω₁= 4.1 rad/s
N₂=32 rpm

ω₂ = 3.3 rad/s
Lets take mass of clay = m kg
Initial angular momentum L₁
L₁ = Iω₁
Final linear momentum L₂
L₂= I₂ ω₂
I₂ = I + m r²
The is no any external torque that is why angular momentum will be conserve
L₁ = L₂
Iω₁ = I₂ ω₂
Iω₁ = ( I + m r²) ω₂
Now by putting the all values
Iω₁ = ( I + m r²) ω₂
24 x 4.1 = (24 + m x 1.2²) x 3.3
24 x 4.1 = (24 + 1.44 m) x 3.3
29.81 = 24 + 1.44 m
1.44 m = 5.81
m=4.03 kg