Recent content by mrjoe2

Edit to the title: CHALLENGE problem on electric potential energy* Homework Statement A proton and an alpha particle (q = +2e, m = 4u) are fired directly toward each other from far away, each with an initial speed of 0.010c. what is their distance of closes approach, as measured between their...

yea that is what i got and i multiplied it by the area of the force pushed to get the change in the force. its not working and i am yielding a change of 49.9212N as you would be as well. the answer given is 920N! please help! my exam in in a couple hours!

I have not effectively done this because my answer is incorrect! the answer using their equation of DeltaF=pg(A1 + A2)h yeilds 920N while mine yields a MUCH smaller number. can you tell me how my approach is effective?

Homework Statement the hydraulic lift at a car repair shop is filled with oil. the car rests on a 25cm diameter piston. to lift the car, compressed air is used to push down on a 6cm diameterpiston. By how much must the air pressure force b eincreased to life the car 2.0m. Homework...

Hi all, I have quite a perfect understanding of hydraulic lift, yet there is one huge problem that is contradicting my understanding. for a hydraulic lift where you push on on side of diameter d1 piston, and the object on a piston of diameter d2, you get the equation: F1/A1 = F2/A2...

can you give me your steps please? general steps nothing perfuse. thanks! you got the correct answer!

ok so, that was one of my many numerous methods. try getting the answer, it will be wrong. you will probably get 40 something. also, you can't assume the collision is inelastic. in fact, my first post of this question had numerous people say i have eto assume it is elastic!

Homework Statement no one gave correct help the first time i sent this out. if you can't do it, don't worry. a 100g granite cube slides down a 40 degree frictionless ramp. at the bottom, just as it exits onto a horizontal table, it collides with a 200 g steel cube at rest, how high above...

i set the total energy before the collision (mgh) equal to the kinetic energy of the initial cube and the now moving cube after collision. so (.1)gh = .5(.1)v1'^2 + .5(.2)(1.5)^2 now i have two variables i need to solve for... first of all, this method doesn't work! if i put in...

i used the conservation of energy with an elastic collision and it did not work. you can try it for yourself, the "correct" answer is posted!

Homework Statement a 100g granite cube slides down a 40 degree frctionless ramp. at the bottom, just as it exits onto a horizontal table, it collides with a 200g steel cube at rest. how high above the table should the granite cube be released to give the stell cube a speed of 150cm/s...

this doesn't work. did you try and get the correct answer when you used your very long process?

Homework Statement a 100g granite cube slides down a 40 degree frctionless ramp. at the bottom, just as it exits onto a horizontal table, it collides with a 200g steel cube at rest. how high above the table should the granite cube be released to give the stell cube a speed of 150cm/s...

also I am not sure its plausible to use l'hopitals rule for limits of x approaching infinite*. that is an important note that most students i tutor forget. they think it can be used for everything, when it is wrong ALOT of the time. i only use it as a last resort

i just subbed it into my graphing calculator and it is one. it makes sense logically too, as well as through limit laws and common sense