A cooling fan is turned off when it is running at 900 rev/min. It turns 1700 revolutions before it comes to a stop.
1 answer:
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
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Answer:
λ = 5.85 x 10⁻⁷ m = 585 nm
f = 5.13 x 10¹⁴ Hz
Explanation:
We will use Young's Double Slit Experiment's Formula here:
where,
λ = wavelength = ?
Y = Fringe Spacing = 6.5 cm = 0.065 m
d = slit separation = 0.048 mm = 4.8 x 10⁻⁵ m
L = screen distance = 5 m
Therefore,
<u>λ = 5.85 x 10⁻⁷ m = 585 nm</u>
Now, the frequency can be given as:
where,
f = frequency = ?
c = speed of light = 3 x 10⁸ m/s
Therefore,
<u>f = 5.13 x 10¹⁴ Hz</u>