L.J

Popular questions and responses by L.J
  1. calculus

    the displacement (in meter) of a particle moving in a straight line is given by the equation of motion s=5t^3+4t+2, where t is measured in seconds. Find the velocity of the particle at t=3.

    asked on November 17, 2011
  2. calculus

    A man starts walking north at 3ft/s from a point P. Five minutes later, a woman starts walking south at 6ft/s from a point 500ft due east of P. At what rate are the people moving apart 15min after the woman starts walking?

    asked on November 17, 2011
  3. calculus

    Two cars start moving from the same point. One travels south at 28mi/h and the other travels west at 50mi/h. At what rate is the distance between the cars increasing 4 hours later?

    asked on November 17, 2011
  4. calculus

    if a snowball melts so that its surface area decreases at a rate of 1 cm^2/min, find the rate at which the diameter decreases when the diameter is 43cm. Leave pi in your answer please.

    asked on November 17, 2011
  5. calculus

    a plane flying horizontally at an altitude of 2 mi and a speed of 460 mi/h passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 5 mi away from the station.

    asked on November 17, 2011
  6. calculus

    the cost (in dollars) of producing x units of a certain commodity is C(x)=5090+13x+0.09x^2. Find the average rate of change with respect to x when the production level is changed from x=105 to x=107.

    asked on November 17, 2011
  7. calculus

    Find a, such that the function f(x)=3x+rad(a-x^2) has the domain [-6,6].

    asked on November 17, 2011