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  1. M

    Gravitation person weight problem

    well i went ahead and entered that answer and got it right. thanks for your help :)
  2. M

    Gravitation person weight problem

    wow, how nice of mastering physics to add in the effect of rotation without the slightest bit of warning. anyway, i checked my notes, and here's what i have written down: V_person = (2*pi*R_e)/(T) = (2*pi*(6.38*10^6 m))/(24*3600 s) = 463.97 m/s ΣF_r=m*a_r n - m*g_0 = m*(-(V_p^2)/R_e) n =...
  3. M

    Gravitation person weight problem

    here's the question (from mastering physics): "The weight of a person at the equator, as determined by a spring balance, is 750 N. By how much does this differ from the true force of gravitational attraction at the same point? Assume that the earth is spherically symmetric." Now, i would...
  4. M

    Springs, friction, angles, and energy

    ok, so i've just checked my notes and the absolute value of friction should be on the other side of the equation. Potential(i) + Kinetic(i) = Potention(f) + Kinetic(f) + |W(friction)| with that, i come out with 14.8 m/s as my final answer. is that right?
  5. M

    Springs, friction, angles, and energy

    i have been given the following problem from everyone's favorite, mastering physics. "The Great Sandini is a circus performer with mass 60.0 kg who is shot from a cannon (actually a spring gun). You don't find many men of his caliber, so you help him design a new gun. This new gun has a very...
  6. M

    What is the speed of the rock physics

    Again another work/kinetic energy problem I need help with. A small rock with a mass of 0.240 kg is released from rest at point A, which is at the top edge of a large, hemispherical bowl with a radius R = 0.500 m. Assume that the size of the rock is small compared to the radius of the bowl, so...
  7. M

    Work and kinetic energy help

    Hi there, I'm new here, and I desperately need help with this work/energy business. Here's my problem: A mail bag with a mass of 140 kg is suspended by a vertical rope of length 8.00 m. a) What horizontal force is necessary to hold the bag in a position displaced sideways a distance 3.00 m...
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