The first harmonic would be the smallest frequency for a string to produce a standing wave. In addition, the strings were fixed in a single attachment and have only limited motion. It is because standing waves require a specific medium for the sound to travel in it.
Answer:
B = 1.3734*10^-7 T
Explanation:
I'm going to take a shot at this since I doubt anyone else would, but I might be wrong, so keep that in mind. Okay, with that out of the way, we know the equation for capacitance:
We also know that it is put in series with a resistor. Since it is initially uncharged and is in series with a battery, it is step response. Using KVL, we will get:
We also know from Ampere's law, there is a magnetic field because of the current induced (right hand rule). From this we can calculate the magnetic field using a contour integral. We can simplify and avoid using Biot-Savart law by using the path of integration of a circle, thus:
Okay now we got all that out of the way, lets first find the area of the plates so we can use the first equation to get capacitance.
Now we need to calculate the current through the capacitor. To do this, use the step response to calculate the voltage drop across the capacitor and then use KVL calculate the current through the resistor. So:
Finally Ampere's law:
B = 1.3734*10^-7 T
Answer:
r = 0.491 m
Explanation:
In this case the System is formed by the teacher with the two masses, so the forces during movement are internal and the angular momentum is conserved
Initial.
L₀ = I₀ w₀
Final
Lf = I w
L₀ = Lf
I₀ w₀ = I w
The moment of inertia is
I₀ = m r₀²
I = m r²
Let's replace
m r₀² w₀ = m r² w
r² = r₀² w₀ / w
Angular velocity
w₀ = 10 rpm (2pi rad / 1 rev) (1 min / 60 s) = 1.047 rad / s
w = 32.5 rpm = 3.403 rad / s
Let's calculate
r = √(0.785 1.047 / 3.403)
r = 0.491 m
Answer:
43 revolutions.
Explanation:
The time it takes for the car to stop is
The distance it travels in that time is
The number of revolutions that the tires make is then
<em>The last calculation just asks the question "how many tire circumferences fit into d=113 meters?"</em>