Why does aluminum expand more than copper
2 answers:
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Answer:
Reactance
Explanation:
In an AC circuit, the capacitive reactance of a capacitor is given by:
where
f is the frequency of the AC current
C is the capacitance of the capacitor
The reactance of the capacitor tells somehow the "resistance" of the capacitor to the passage of current through it. In fact:
- When the frequency of the AC current is zero (this means, we are in regime of DC current), the reactance becomes infinite, and this is true because the capacitor does not let the current pass through it)
- When the frequency of the AC current tends to infinite, the reactance becomes zero, and this is true because in this case the current changes direction so fast that the capacitor has not enough time to "block" the current, so the current almost no feels the presence of the capacitor.
Answer:
a)
b) I =
c) N*m
d) a =
e) W= 0.25 rad/s
Explanation:
a) we know that:
where is the ubicaton of the center of mass,
the mass of the first rocket,
its distances with the rocket 1,
the mass of the second rocket and
its distance with the rocket 1. So, replacing values, we get:
So, the center of mass is at 60m from the rocket 1.
b) we know that:
where I is the moment of inertia, is the mass of the rocket 1,
its distance from the center of mass,
the mass of the second rocket and
the distance between the rocket 2 and the center of mass. So, replacing values, we get:
I =
c) We know that:
T = Fr
where T is the net torque, F is the force and r is the distance between the rocket and the radius. Then:
Replacing values, we get:
50,000N(60m)+50,000N(30m) = T
N*m
d) We know that:
T = Ia
where T is the net torque, I the moment of inertia and a is the angular aceleration. So, replacing values, we get:
solving for a:
a =
e) Finally, using:
W = at
where W is the angular velocity, a is the angular aceleration and t is the time.
Then, replacing values. we get:
W = ()(30s)
W = 0.25 rad/s