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1. Gravitation person weight problem

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