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  1. S

    1-D Kinematics Problem

    Even if it's quadratic, why wouldn't you be able to solve for t?
  2. S

    1-D Kinematics Problem

    Why can't you solve for t?
  3. S

    Free-fall gravity problem

    Yes, when the object is in freefall on Earth, gravity = a = 9.8m/s^2 down. Signs are optional but you could say -9.8n/s^s. In 2D, the gravity is always 9.8m/s^2 down on the object. It doesn't matter how the object is moving or thrown, gravity is always down.
  4. S

    Acceleration due to Gravity

    Hitchhikers reference eh? The other object should be the falling whale.
  5. S

    Kinematics Problem

    I just gave you the answer.
  6. S

    Finding rate of magnetic field PLEASE HELP!

    Oh I see. Thanks for setting me straight. I'm still learning and your opinion is very helpful to me.
  7. S

    Finding rate of magnetic field PLEASE HELP!

    Area of wire, cross section area.
  8. S

    Finding rate of magnetic field PLEASE HELP!

    Well, circumference=pi*diameter, lol 102 turns = 102 circumferences
  9. S

    Finding rate of magnetic field PLEASE HELP!

    Oh I see. What's the step after finding R?
  10. S

    Kinematic graphs

    The graph of the acceleration is the graph of the derivative of the v-graph. Find the slope at each second and graph it onto a new graph. The a-graph is not linear.
  11. S

    Finding rate of magnetic field PLEASE HELP!

    Isn't the L for B=UIN/L the length of the solenoid not the length of the wire?
  12. S

    Conservation of Energy max height

    Break the velocity into components.
  13. S

    Kinematics Problem

    Yes, i know.
  14. S

    Kinematics Problem

    Wait, I think it was the d for the 4th second, from 3-4s. Because the first second is 0-1s, second second is for 1-2s, etc. So Vf=vo+at V@3=5+9.8*3 and V@4=5+9.8*4 Vf^2=Vo^2+2ad (V@4)^2=(V@3)^2+2*9.8*d Find d
  15. S

    Kinematics Problem

    Well, d=Vot+.5at^2 so d should be 98.4m. Did you get that?
  16. S

    Determine distance traveled up an incline w/ friction

    Mass is mass. There is no component of mass, just component of weight.
  17. S

    Finding rate of magnetic field PLEASE HELP!

    B=µoNI/2r, B is magnetic force, µo is magnetic constant, N is number of turns, I is current, r is radius I think that's it but that R is unused in the problem, and it concerns me that I missed something.
  18. S

    Determine distance traveled up an incline w/ friction

    Yes. There is friction force and it cause it to decelerate. Ff=ma, try that.
  19. S

    Determine distance traveled up an incline w/ friction

    Did you draw a force diagram? Ff=uFn, Fn is a component of weight. Is there an answer to compare to?
  20. S

    Conservation of Energy max height

    Max height has to do with potential energy. Kinetic energy at max height is a conceptual question and idea.
  21. S

    Finding rate of magnetic field PLEASE HELP!

    Is there an answer to compare to at the back of the book?
  22. S

    Liquids and densities help please! due tommorow

    Also, try reading these: https://www.physicsforums.com/showthread.php?t=22103 https://www.physicsforums.com/showthread.php?t=46779
  23. S

    Liquids and densities help please! due tommorow

    Well, you are right up to the last part of 21.398N. You also need to account for the Fb of the lead underwater.
  24. S

    EMF and circuits

    Is there an answer in the back of the book to compare to?
  25. S

    Series Problem. Help?

    V=IR Both: 12=(R1+R2)I; R2 removed: 12=R1(I+.2) R1 removed: 12=R2(I+.1) Solve for R's R1=12/(I+.2) R2=12/(I+.1) Plug into original equation 12=(12/(I+.2)+12/(I+.1))I Solve for I I=.1414 Plug I back into R1 and R2 R1=12/(.1414+.2)=35.15ohm R2=12/(.1414+.1)=49.7ohm
  26. S

    Bullet passing through 4cm thick board

    First off, deceleration is constant, if the board is uniform. The equation you use is d=.5(vo+vf)t. d, vo, vf is given. Also, don't forget to convert cm to m.
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