Recent content by maxalador

Homework Statement At one instant, force F: 4.0j N acts on a 0.25 kg object that has position^vector^V : (2.0t - 2.0k) m and velocity vector /: (-5.0i + 5.0k) m/s. About the origin and in unit- vector notation, what are (a) the object's angular momentum and (b)the torque acting on the object...

oh i see so it would be sin instead of cos and then you solve for normal force in the Y direction minus the mg Thanks a ton.

Was this what you wanted? you said the the total force is equal to zero. i thought that this would mean that the friction force is equal to fdcos(theta) because then the system would have no force in the X direction. i know that the friction force is also equal to U*N. it is around here when...

so then friction force is equal to N(mg)-fdcos(theta)?

so what your saying is that the thermal energy is equal to the kinetic energy and that the friction force is equal to 0?

Homework Statement a rope is used to pull a 3.57kg block at constant speed a distance 4.06m along a horizontal floor. the force on the block from the rope is 7.68 N and is directed 15 degrees above the horizontal. a) calculate the work done by the ropes force b) calculate the increase in...

Unfortunately, no. the document i pulled this from is on my flash drive, so i just copy pasted the question.

I know that KEi=KEf, but how will i get the mass or velocity needed to use this equation? This is the main problem I have with this equation

I know that means Pi=Pf so Ball A's P=32, but does it mean that ball A initial = ball B initial? or just than Ball A initial = Ball A final?

Homework Statement Ball A with mass 4 kg is moving with a velocity of 8 m/s North when it crashes into Ball B with unknown mass moving with a velocity of 6 m/s West. This collision is perfectly elastic. If Ball A ends up moving with a velocity of 6.5 m/s @ 120° after the collision, find the...

I see what you mean. Thanks for all your help

KE= 1/2mv^2 KE=1/2*5.8*21.2^2 KE=1303 KE=PE 1303=mgh 1303=5.8*9.8*h h=22.9

I see Ke=Pe so when you solve you will be left with height. Thanks for this i did not understand it when my teacher taught this

so after solving for the final velocity what equation do I use to solve for the height?

the question was made by my teacher. He also gave me the other equation i posted which is why i could not solve for the velocity. also, I noticed the kinetic energy but he makes a lot of problems with numbers similar to these so i thought nothing of it.