The 4.5 cm long second hand on a watch rotates smoothly. What is its angular velocity? What is the speed of the tip of the hand?
1 answer:
Angular velocity means how many radians/degrees is this hand passing by every second.
First, you realize it goes through a whole revolution (2
in radians) in 60 seconds.
This means for every second, it passes by:
For the next part, you need to know this equation:
Tangential velocity=Angular velocity x radius (meters)
First, you realize it goes through a whole revolution (2
This means for every second, it passes by:
For the next part, you need to know this equation:
Tangential velocity=Angular velocity x radius (meters)
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Answer:
E = ρ ( R1²) / 2 ∈o R
Explanation:
Given data
two cylinders are parallel
distance = d
radial distance = R
d < (R2−R1)
to find out
Express answer in terms of the variables ρE, R1, R2, R3, d, R, and constants
solution
we have two parallel cylinders
so area is 2 R × l
and we apply here gauss law that is
EA = Q(enclosed) / ∈o ......1
so first we find Q(enclosed) = ρ Volume
Q(enclosed) = ρ ( R1² × l )
so put all value in equation 1
we get
EA = Q(enclosed) / ∈o
E(2 R × l) = ρ (
R1² × l ) / ∈o
so
E = ρ ( R1²) / 2 ∈o R