Recent content by Covenant32

The answer is in terms of "c". So, I thought that perhaps I could just find the ratio of 3.75e7 to 3e8, which is .125, but that is incorrect. I'm really lost on this blasted problem. It is the last one of close to 40 I've done.

I have no idea why the template is copied multiple times. Sorry about that.

Homework Statement How fast would a star have to travel to make violet light (λ = 400 nm) appear to be blue (λ = 450 nm)? Assume the star is moving along the line that connects the star to the Earth. Homework Equations λr = λc / (c-Vr) f= fo (c +- Vr / c +- Vs) The Attempt at a...

Thanks, Delphi. In my textbook, doppler shift is covered 2 pages, and thus of little use.

Homework Statement Estimate the Doppler shift for a radio wave reflected from an airplane moving directly toward you at a speed of 292 m/s. Assume the radio wave has a frequency of 9.7x10^6 Hz. Homework Equations fo = fv/(v − vt) The Attempt at a Solution Using the above...

Thank you, Delphi. I think that perhaps the torque is zero. My reasoning is that the forces acting on the loop are not trying to rotate it. At least that is how it appears. What do you think of that?

Length of rod is not given. Truly. e*(v^2)*B would be 3.6E-19 N? I^2*r=F*v => I = 1.04E-10 amps? Does that seem correct?

Isn't it F=BILsinθ? But surely that doesn't apply here? There is no length given, after all. For B) If the wire has a resistance of 100 ohms, what is the current in the wire? I=V/R, but I do not know the voltage, nor am I certain how I can ascertain it with the given information. I...

Aaah, got it. That should've been evident from the beginning. :redface: Thank you, Doc Al. You have alleviated me some frustration. :smile:

Homework Statement The current loop is in the y-z plane. The direction of the magnetic field is in the z-direction. A) Which way is the torque on the current loop? B) If the current is 4 amps and the magnetic field strength is 2.5 Tesla, what is the magnitude of the torque? here is the...

Thank you, Doc Al. I redid my calculation in that format and got 7.96E-7. Does that seem correct? Again, thank you.

Homework Statement A) Find the magnitude of the magnetic field 10 cm away from the wire at point P as shown in the picture. The current is directed along the x-axis. B) Find its direction Info: I = 5 amps. Point P lies on the Y-axis. Current on the X-axis. Picture (I have drawn)...

Homework Statement The wire shown is being pulled through a constant magnetic field of 0.25 Tesla at 3 m/s. A) Find the power required to pull the loop at this speed. B) If the wire has a resistance of 100 ohms, what is the current in the wire? Homework Equations The Attempt at...

Oh, I forgot to speak of the figure: 0~~~O Two figures are compressing a spring .15 m.

Homework Statement Two particles of mass m1= 2.2 kg and mass m2 = 4.5 kg that are free to move on a horizontal track are initially held at rest so that they compress a spring as shown in the figure below. The spring has a spring constant k = 395 N/m and is compressed 0.15 m. Find the final...