Recent content by physicsgirlie26

Homework Statement Find the composites for the relations defined. R1={(x,y) member of real numbers x real numbers: y=x} R2={(x,y) member of real numbers x real numbers: y=-5x+2} a) R1compositeR1 b)R2compositeR2 2. The attempt at a solution a) I was thinking that...

haha got it! Thank you!

Ok how about this: Proof: Let A={4,26}, B={4,23}, and C={26,23}. If (A-C)=26 and (A-C)=4, that means that (A-B)intersect(A-C) equals the empty set. But B intersect C = 23 which is not the empty set, therefore there is a contradiction. How is that?

I was wondering if someone could please look over my proof of this set theory problem and let me know if I am doing it right or not and give me some help. Provide a counterexample for the following: If (A-B)intersect(A-C)=empty set, then B intersect C = empty set. Proof: Assume...

Ok. Thanks for all of your help! :0)

But how would you prove that that m and n are both negative whenever the antecedent is true?

I really don't understand it either and it is killing me. -.- I have a headache because I'm trying to figure it out and I can't. haha Does anyone have any other suggestions on how to go about this proof?

no the gcd(12, 15)=3.

Prove that: d) there do not exsist integers m abd n such that 12m+15n=1 f) if there exist integers m and n such that 12m+15n=1, then m and n are both positive. so far for d i have d) since 12m is always a multiple of 3 and since 15n is always a multiple of 3, then adding or...

Can someone just let me know if the first one is right? I know the second one is B and that the thrid one is supposed to be d and not c but i want to make sure i am right about the first one. I think its A and C because that is were the KE is zero making force zero, right? thanks!

potential energy. check answers please :) A marble moves along the x-axis. The potential-energy function is shown in the figure attached. At which of the labeled x-coordinates is the force on the marble zero? -a and c -b and d I was thinking it was at a and c Which of the...

A 125kg mail bag hangs by a vertical rope 3.9 m long. A postal worker then displaces the bag to a position 1.9 m sideways from its original position, always keeping the rope taut. What horizontal force is necessary to hold the bag in the new position? I used the gravitational...

hahaha thanks. no wonder why i got it wrong. Such a silly mistake. Thanks!

A glider with mass m= 0.230 kg sits on a frictionless horizontal air track, connected to a spring with force constant k= 5.40 N/m. You pull on the glider, stretching the spring 0.100 m, and then release it with no initial velocity. The glider begins to move back toward its equilibrium position...

got it! Thank you sooo much neutrino for pointing me in the right direction! all i needed was a little help!