Recent content by JennV

  1. J

    Special Relativity: Time Dilation

    Homework Statement An Earth satellite used in the Global Positioning System moves in a circular orbit with period 11 hours and 58 min. The satellitle contains an oscillator producing the principal nonmilitary GPS signal. Its frequency is 1575.42 MHz in the reference frame of the satellite...
  2. J

    Net Force Produced By Currents In Wire And Square Loop

    Homework Statement A long, straight wire carries a current of 14A. Next to the wire is a square loop with sides 1.0m in length, as shown in the figure. The loop carries a current of 2.5A in the direction indicated. http://img69.imageshack.us/i/walker2260.jpg/ Calculate the magnitude of...
  3. J

    Maximum Charge on Parallel-Plate Capacitor with Mica Dielectric

    Homework Statement A parallel-plate capacitor is made from two aluminum-foil sheets, each 3.80cm wide and 15.0m long. Between the sheets is a mica strip of the same width and length that is 0.0225mm thick. What is the maximum charge that can be stored in this capacitor? (The dielectric...
  4. J

    Derivative of an integral and evaluating an integral

    Thank you so much to everyone that left a response to my question. I did manage to get the correct answer for #1, YAY! =) But I'm still struggling with #2. Applying what has been said would it be: Where U is sqrt(x), so du=1/2x^-1/2 So I would put in -sin((1/2x^-1/2)^2), is this the...
  5. J

    Derivative of an integral and evaluating an integral

    Homework Statement 1.) Evaluate the integral ∫ x*4th root( 25 + x^2)dx 2.) Find dy/dx y= ∫2pi (upper limit) sin(t^2)dt sqrt(x) (lower limit) Homework Equations Antiderivative The Attempt at a Solution 1.) I'm not sure how would I find the antiderivative of a...
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    Newtonian Gravity involving spheres in a trigonal pyramid

    Homework Statement In deep space, three spherical masses are held in fixed positions (by rods light compared to the masses) at three corners of a square of side length sqrt(18) m as shown. The masses of the three spheres are m1 = m3 = 1.76×10^9 kg, and m2 = 2.75×10^9 kg. A relatively small...
  7. J

    Rotational Dynamics involving a pulley, spring, and block

    Thank you so much tiny-tim for replying! But I actually already have derived the answer myself and it was 3.00! YAY! =D
  8. J

    Rotational Dynamics involving a pulley, spring, and block

    Homework Statement A block of mass m = 9.00 kg is situated on an incline of angle θ = 51.0^{\circ} with coefficient of kinetic friction \mu_k = 0.200, and is connected to a light spring of spring constant k = 40.0 N/m via a light rope passing over a massive pulley as shown. The block is...
  9. J

    Rotational Energy, 2 blocks and a pulley (solid uniform sphere)

    Homework Statement Consider the system below. The mp = 20.0 kg 'pulley' is a solid uniform sphere of radius of 0.250 m with the frictionless axle passing through its diameter. The mass of the block on the incline is m1 = 16.0 kg , and the coefficient of kinetic friction between the two...
  10. J

    How High Does the Lighter Ball Rise After Collision?

    Homework Statement Amplified Rebound Height Two small rubber balls are dropped from rest at a height h above a hard floor. When the balls are released, the lighter ball (with mass m) is directly above the heavier ball (with mass M). Assume the heavier ball reaches the floor first and bounces...
  11. J

    Forcing a Particle to Rest: Analyzing Position-Dependent Force

    Homework Statement A 30.0 kg particle is initially at x=0 and has a velocity of 5.50 m/s. It encounters a position-dependent net force F(x) described by the graph shown (the graph continues indefinitely in the manner shown past x=20.0 m). Diagram...
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    Work done on block by spring and friction

    Homework Statement In the system shown in the figure, suppose the block has a mass of 2.7 kg, the spring has a force constant of 480 N/m, and the coefficient of kinetic friction between the block and the floor is 0.18. Find the work done on the block by the spring and by friction as the...
  13. J

    How do I find the necessary force to start a crate moving on a rough floor?

    Thank you so much for helping me. =) I finally got the answer correct.
  14. J

    How do I find the necessary force to start a crate moving on a rough floor?

    In the horizontal direction the forces that act are; applied force, static friction. So 0=Fcosθ-(uk*Fn) ?
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