Acentrifuge is a common laboratory instrument that separates components of differing densities in solution. this is accomplished by spinning a sample around in a circle with a large angular speed. suppose that after a centrifuge in a medical laboratory is turned off, it continues to rotate with a constant angular deceleration for 10.0s before coming to rest. part aif its initial angular speed was 3890rpm , what is the magnitude of its angular deceleration? (|? | in revs/s^2 )part bhow many revolutions did the centrifuge complete after being turned off?

a) α = - 6.4833 rev/s²

b) n = 324 rev

Explanation:

ω₀ = 3890 rpm = (3890 rev/min)(1 min/60 s) = 64.833 rev/s

ω₁ = 0 rev/s

t = 10 s

α = ?

a) We can apply the equation:

ω₁ = ω₀ + α*t     ⇒    α = (ω₁ - ω₀) / t

⇒    α = (0 rev/s - 64.833 rev/s) / 10 s

⇒    α = - 6.4833 rev/s²

b) We have to get Δθ as follows

Δθ = ω₀*t + 0.5*α*t²

⇒   Δθ = (64.833 rev/s)*(10 s) + 0.5*(- 6.4833 rev/s²)*(10 s)²

⇒   Δθ = 324.1666 rev

⇒   n = 324 rev

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explanation:

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000