# Recent content by Carpe Mori

1. ### Wheel Climbing a Step Force

When the torque due to gravity is not greater than the torque due to the force...or i guess the force just has to be equal to it sooo when Tf=Tw?
2. ### Wheel Climbing a Step Force

http://i35.photobucket.com/albums/d185/giddyrayne/Picture018.jpg [Broken] I understand torque = perpendicular force * radius but it seems to me that the force's angle to the pivot point keeps changing.
3. ### Wheel Climbing a Step Force

1. Homework Statement a wheel of mass M has a radius R It is standing vertically on the floor and we want to exert a horizontal force F at its axle so that it will climb a step against which it rests. The step has a height h where h<R what is the minimum force F needed? 2. Homework...
4. ### Rotational Motion of a cylinder

1. Homework Statement A hollow cylinder (hoops) is rolling on a horizontal surface at speed v = 4.3 m/s when it reaches a 15 degree incline (a) how far up the incline will it go? (b) how long will it be on the incline before it arrives back at the bottom? 2. Homework Equations PE = KE...
5. ### Rotational Motion Problem (a bike)

well i took my C = 2pi*Rr/Nr = 2pi*Rf/Nf and solved for both Rr and Rf and then plugged those values into my initial angular velocity equations. and i resulted with Wr/Wf = Nf^2*Rr^2/Nr^2*Rf^2 is this correct yes or no?? it means angular velocity depends on both Radius and number of teeth...
6. ### Rotational Motion Problem (a bike)

1. Homework Statement How is the angular speed of the rear wheel (Wr) of a bicycle related to that of the pedals and front sprocket (Wf)? That is derive a formula for Wr/Wf. Let Nf and Nr be the number of teeth on the front and rear sprockets respectively. The teeth are spaced equally on all...
7. ### Circular Motion and Gravitation of a star

oh snaps i figured it out if anyone cares.... my mistake was that in the equation for graviational attractive force (F = G*m1*m2/r^2) the r is actual distance between the two center of masses and my mistake was that i thought it was half of that distance (the radius) so yeah...cheers?

anyone?????
9. ### Why does Moon cause larger tides than Sun?

The tidal force produced by a massive object (Moon, hereafter) on a small particle located on or in an extensive body (Earth, hereafter) is the vector difference between the gravitational force exerted by the Moon on the particle, and the gravitational force that would be exerted on the particle...
10. ### Circular Motion and Gravitation of a star

1. Homework Statement Two equal-mass stars maintain a constant distance apart of 8.0 x10^10 m and rotate about a point midway between them at a rate of one revolution every 12.6 yr (a) why don't the two stars crash into one another due to the gravitational force between them (b) what must...
11. ### Atmospheric pressure homework

P = F / A leads to F = P*A
12. ### Circular Motion and angle alpha

well that problem was officially boring. Thank you very much Dick!
13. ### Circular Motion and angle alpha

Ok now can anyone help me figure out B....that is if i got A correct. I really honestly have no idea what they want me to do for B. Idk if im supposed to look up values for this or what (i can find a rough volume of it i suppose but its not like i know the base or anything) I am certain there is...
14. ### Frictional Force Block Problem-VERY EASY But need HELP!

o hahah i got it....it is asking for the frictional force not the net force acting on cube. dyanamicsolo explained it well enough u should be able to figure it out now
15. ### Frictional Force Block Problem-VERY EASY But need HELP!

doesnt seem like it....shrug ur shoulders and scoff at whoever made that question and hope that your scoffing is deserved...cuz if its not...then u just look like a moron ahahah I'm no expert but it seems to me that right answer is not present. **shrug**