That's the equation I'm used to. If we assume that the angle is small then sintheta=y/L
dsintheta=m*wavelength
d(y/L)=m*wavelength
m*wavelength*L/(d)=y ? I don't know what's wrong with the equation. For the units I coverted everything to cm because 1/7300=d in cm.
Homework Statement
White light containing wavelengths from 396 nm to 756 nm falls on a grating with 7300 lines/cm. How wide is the first-order spectrum on a screen 2.15 m away?
Homework Equations
y=m*L*wavelenth/(d)
The Attempt at a Solution
using the equation I have found y1 to...
Homework Statement
A circular coil with 35 turns of wire and a diameter of 19 cm is placed in a magnetic field given by B(t) = 6 t^2 + 6 t + 2 T where t is time in seconds. The field is perpendicular to the plane of the coil. What is the induced EMF at t = 5 s?
Homework Equations...
Homework Statement
A capacitor with a capacitance of C = 28.7 μF is slowly charged by a constant current of I = 63.2 nA. How long does it take to charge the capacitor to a voltage of V = 28.9 V?
Homework Equations
q=cvb(1-e^(-t/RC))
Vb=IR+QC
The Attempt at a Solution
I have tried...
Ok so I got it by using voltage loss=amps*wire resitance/meter*distance
Usually this equation is
voltage loss=amps*wire resitance/meter*distance*2 wires
Why was it not necessary to multiply the answer by 2 in this case?
Homework Statement
A bird stands on an electric transmission line carrying 2210 A, as seen in the figure below. The line has 3.32E-5 Ω resistance per meter and the bird's feet are 3.80 cm apart. What voltage does the bird feel?
Homework Equations
R=sigma(L)/A
I=V/R
The Attempt at a...
Homework Statement
An underground telephone cable, consisting of a pair of wires, has suffered a short somewhere along its length (at point P in the Figure). The telephone cable is 4.00 km long, and in order to determine where the short is, a technician first measures the resistance between...
Homework Statement
A rod of length 25 cm has a uniform linear charge density of 7 μC/m. Determine the Electric Field at a point P located at a perpendicular distance 69 cm along a line of symmetry of the rod.
Homework Equations
E=k*charge density(integral(dx/(d^2+x^2)^3/2)
The...
Homework Statement
An object in SHM oscillates with a period of 5.73 s and an amplitude of 10.47 cm. How long does the object take to move from x=0 cm to x=5.78 cm?
Homework Equations
x=Acos(wt+ro)
The Attempt at a Solution
I solved for ro which was pi/2 when x=o and t=o. Then...
Homework Statement
A spring with spring constant 18.39 N/m hangs from the ceiling. A 452 g ball is attached to the spring and allowed to come to rest. It is then pulled down 4.62 cm and released. What is the time constant if the ball’s amplitude has decreased to 2.85 cm after 32 oscillations...
The question has several parts and it's asking me for the phase at t=.5s. I used the same formula but it's wrong. Could you please let me know what's wrong? thank you.
ok, so for t=.5s I get -102.115 but that's wrong. All I did is wt+constant(-103.48). But that's wrong for some reason. Does the constant change at that time?
Also, in this case, is angular speed the same as velocity? If I wanted to find the phase at t=0 s would I just need to use wt+ro, w being the velocity?
Ok thank you very much for all your help I really appreciate it. I have one more question. Me and my friend have been trying to figure it out but we can't. Could you please help us. Thank you.
https://www.physicsforums.com/showthread.php?t=320317
I got it. For some reason the answer was -.042 when the calculator was in radian. do you know why I have to put the calculator in radians? I have a test tomorrow and I would not have gotten this answer right.