Answer:
a)
125.6 rad/s
b)
25.12 rad/s²
Explanation:
a)
t = time required by the fan to get up to final operating speed = 5 sec
w = final operating rotational speed = 1200 rpm
we know that :
1 revolution = 2π rad
1 min = 60 sec
w =
w =
w = 125.6 rad/s
b)
w₀ = initial angular speed = 0 rad/s
α = angular acceleration
using the equation
w = w₀ + α t
125.6 = 0 + α (5)
α = 25.12 rad/s²
Answer:
Explanation:
Given data
At d₁=4.5×10¹⁰m the speed of comet is Vi=9.2×10⁴m/s
At d₂=6×10¹²m the speed will Vf
The work done by surrounding is zero and the energy of system at the initial state equal the energy at final state so we can apply:
Substitute the given values to find final velocity Vf
So
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D. velocity includes rate of change and direction