Friday

December 19, 2014

December 19, 2014

Posted by **Anonymous** on Thursday, March 8, 2012 at 12:19pm.

a) Find the energy transformed from mechanical to internal in the particle—hoop—floor system as a result of friction in one revolution.

b) What is the total number of revolutions the particle makes before stopping? Assume the friction force remains constant during the entire motion.

- Physics -
**Saycks**, Friday, January 4, 2013 at 6:07ama) Relevant equation: Emec = DU + DK

If there are no nonconservative forces, this equation equals zero. Or in this case, some K is transformed into Eint (heat). So the equation becomes: Emec = Ff.d. (F in Newton, distance in meters and N.m = J).

-> DU + DK = Ff.d

Then, 0,5 m vi² = 0,5 m vf² + Ff.d

What do you need is: Ff.d = 0.5 m vi² - 05. m vf². (/!\ all the expression Ff.d is the answer, do not separate it).

b) You know what is the initial speed,

so you have the Ki = 0.5x0.4x64

Or you know that each turn you loose a certain quantity of energy (answer A).

-> Ki/ansA = ...

**Answer this Question**

**Related Questions**

science - A heavy particle is placed at the top of a vertical hoop.Calculate the...

physics - A mass M of 7.00E-1 kg slides inside a hoop of radius R=1.30 m with ...

Physics - A mass M of 5.80E-1 kg slides inside a hoop of radius R=1.50 m with ...

Physics - A particle of mass m = 27 g slides inside a bowl whose cross section ...

physics - A circular conducting hoop of wire has a constant magnetic field |~B...

Physics - A 190 kg hoop rolls along a horizontal floor so that the hoop's center...

physics' - A 100 kg hoop rolls along a horizontal floor so that the hoop's ...

physics - A 0.349 kg particle slides around a horizontal track. The track has a ...

Physics - Suppose that a steel hoop could be constructed to fit just around the ...

physics - a small bead can slide without friction on a circular hoop that is in ...