Recent content by passphysics

Homework Statement A 4 kg block rests on 37 degrees inclined plane with wheels, held in place by a light rope which is parallel to the plane. The coefficient of static friction is 0.3 and the coefficient of sliding friction is 0.2. The mass of the inclined plane (with wheels) is 16 kg...

To Chris You are right, centripetal force always point to the center of the circle. I just chose a coordinate system where the centripetal acceleration is on the positive y-axis.

for C.) v=(2 pi r)/T so v^2 = (4 pi^2 r^2)/T^2

Sorry, for my attempt A.) a=(GM)/r^2 C.) r=the cube root of [(GMT^2)/4pi^2)]

Homework Statement A.) What is the acceleration due to gravity at an altitude of 1500 km above the Earth's surface. Neglect the effect of the Earth's rotation. The Earth's radius is 6378100 m and its mass is 5.98 * 10^{24}kg. B.) The moon has a mass of 7.35 * 10^{22} kg and is located...

Thanks! for b i ended up getting mg=N/2

So v2=\sqrt{r(g-1/3g} which means v=\sqrt{r2/3g} for 1a. for 1b.) the centripetal force points in the direction the normal force does, upwards. the equation would be N-mg=mv^{2}/(2r/3) if i replace v with the equation from 1a.) then the equation would be: mg=N-(m(2/3)gr)/(2/3 r) which...

1a. Homework Statement You are riding in a car over a hill that has a radius of curvature R. What speed should you be going if you want to feel one-third of your normal weight. Express your answer in terms of the radius R and the acceleration due to gravity g. 1b. You continue your...