Answer:
a)α = - 0.415 rad/s²
b)t=226.68 sec
Explanation:
Given
Initial angular speed
ωi= 900 rev/min
ωi= 94.24
θ = 1700 rev
We know that
1 rev = 2π rad
θ = 3400π rad
Final angular speed ωf=0 rad/s
α=Angular acceleration
We know that
ωf² = ωi²+ 2 α θ
0² = 94.24²+ 2 x 3400π x α
α = - 0.415 rad/s²
Negative sign indicates that acceleration and speed is in opposite direction.
We also know that
ωf = ωi+ α t
0 = 94.24 - 0.415 x t
t=226.68 sec
a)α = - 0.415 rad/s²
b)t=226.68 sec
Answer:
Here we need to make parallel connection of two 80 ohm resistors to achieve 40 ohm net resistance.
Explanation:
As we know that the resistances in series add up directly and here we are given with only the resistors of 80 Ω.
So when we connect two resistors of 80 ohm in parallel we get the resultant of 40 ohm.
Mathematically:
gives us the only combination of two resistors in parallel.
