Recent content by mrsvonnegut

Oh I get it! Thank you so much, I think I'll get the right answer now.

Thank you for your help! I'm not quite sure what you mean by introducing uncertainties. Also, the value I gave was in eV, but that's totally right for J/s!

Homework Statement So today in class we did a lab where we calculated the stopping voltage of lights of different wavelengths. We did this experimentally. I have the wavelength, frequency, and stopping voltage of four different lights. I need to calculate the work function of the material, and...

Got it--so the KE of the v of Earth's period (to move it upward), plus my earlier work to put it in orbit. THANK YOU SO MUCH! You were so helpful and patient!

My teacher provides a way to find the period when I have the velocity, which I know from our earlier work! So for part c, should I substitute Earth's period, then find the new velocity, then find the new KE, and find the difference between the KE's?

Yes, I do have that!

Oh--we haven't done that in my class! Is there a way to avoid it?

What is ω? I don't think I've learned it yet. Is it a symbol?

*r^2

GmM/d^2 = m(v^2/r)?

mg = m(v^2/r), but should I use regular gravity?

I'm not sure how to show the gravitational force between Earth and the satellite--should I use mg? Also, one of my friends told me just to calculate the PE of the satellite above Earth as PE=G([250 kg)(5.97 x 10^24)]/(4.0 x 10^6]), which gives a total of 24887437.5 J, which is a different...

Nope! My teacher said we're not considering it.

Okay! I did: PEi=G([(250 kg)(5.97 x 10^24 kg)]/[6378100 m]) PEf=G([(250 kg)(5.97 x 10^24 kg)]/[6378100 m + 4.0 x 10^6 m]) The difference between the two was 6007709504 J. (5.97 x 10^24 kg is what I used as the mass of the earth, and 6378100 m is what I used as the radius of the earth). Does that...

Homework Statement I have a satellite with a mass of 250 kg, which I'm launching from Earth. This neglects air resistance/rotation of the planet etc. a. How much energy is needed to put the satellite in orbit at an altitude of 4.0 x 106 m? b. What would be the period of the satellite at that...