Recent content by jcook735

  1. J

    Orbit changes, Kepler's Third Law

    the only other thing i could think of is 2T over r cubed but that doesn't seem right..
  2. J

    Orbit changes, Kepler's Third Law

    Oh is that T2=4(pi)2r3 / GM?
  3. J

    Hohmann Transfer, energy for both boosts

    Homework Statement For a circular orbit around a massive gravitating body, the speed depends on the radius according to Equation 8.3; for elliptical orbits, the speed varies according to the equation v2= 2GM[(1/r)-(1/2a)], where r is the distance from the massive body and a is the semimajor...
  4. J

    Orbit changes, Kepler's Third Law

    Isnt the differentiate of Kepler's Third law my relevant equation?
  5. J

    Orbit changes, Kepler's Third Law

    Tidal effects in the Earth-Moon system are causing the Moon's orbital period to increase at a current rate of about 35 ms per century. Assuming the Moon's orbit around the Earth is circular, to what rate of change in the Earth-Moon distance does this correspond? Hint: differentiate Kepler's...
  6. J

    Maximum Safe Speed for Cars on Reverse Bank Angle Highway Curve

    I talked to my teacher about it, and he said it was supposed to be a question you can't answer. So thank you Doc Al
  7. J

    Maximum Safe Speed for Cars on Reverse Bank Angle Highway Curve

    Oh, well my physics professor must hate me then. the problem in full is: State highway 33 south of Stillwater is scheduled for (extensive) modification between the Cimarron river and US 177 by fall 2012. Dr. Hasty has noticed that one of the curves on this asphalt highway (which is scheduled...
  8. J

    Maximum Safe Speed for Cars on Reverse Bank Angle Highway Curve

    So if I am understanding you right, there is a component of mg along the inclined plane downwards which is mg*sinθ and there is a component of centripetal force along the inclined plane upwards which is Fc/cosθ? If that is correct, then I thank you
  9. J

    Maximum Safe Speed for Cars on Reverse Bank Angle Highway Curve

    A car is on a highway curve of 6160 m radius, and the highway is frictionless. The car on a reverse bank angle, aka the the tilt is angled away from the center of curvature. The angle of tilt is 4 degrees. What is the maximum safe speed for cars driving on the highway? I know that N=...
  10. J

    Very tricky double integration problem

    Oh well I just needed help on the first part cause the second part followed suit. I got it right thank you both very much!
  11. J

    Very tricky double integration problem

    alright my bad. I am taking the ∫2- 32/16+y2. first, i separated the parts, so I have ∫2 - ∫(32)/(16+y2). The first integral is 2y. For the second integral, i pulled 16 out of the bottom, so i had (32)/((16)(1+(y/4)2)). I canceled out the 32 and 16, so i ended up with (2)/(1+(y/4)2). So then...
  12. J

    Very tricky double integration problem

    can yall check to make sure i did my integration correctly? for the equation you gave me, I should end up with 2y - (1/2)arctan(y/4), correct?
  13. J

    Very tricky double integration problem

    OH! I got it. Thank you guys so much :)
  14. J

    Very tricky double integration problem

    oh haha my bad I didnt know you could do that. why does y^2 turn into 32??
  15. J

    Very tricky double integration problem

    Calculate the double integral. ∫∫((5x)/(xsquared)+(ysquared)) dA, R = [1,4] x [0,1]. Find the value of the integral. Well I tried the integral starting with x and then starting with y and couldn't do it either way. Ill show the method using x first. To start off I tried using...
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