Recent content by JwdePhysics

Homework Statement A -> Products The two half-lives are 34 minutes and 68 minutes respectively. Find the order of the reaction. So I and my friends are having disagreements over whether this is first order or second order or not. Homework Equations For first order half-life, t = 0.693/k For...

Sorry I came back after a while and noticed I messed up the second equation I wrote v+v'=5vfsinθ when it should be v+4v'=5vfsinθ since the second ball has 4 times the mass.

Homework Statement How many of the following would you NOT expect to be more soluble in acid than in pure water? FeS, CuCN, AlPO4, BaCO3, AgCl Homework Equations None necessary The Attempt at a Solution So we know that anything with OH- or anything that has the conjugate base of a weak acid...

Homework Statement The questions asks which of the following would make a buffer given that all solutions are 0.100M and you have solutions of acetic acid, sodium hydroxide, and hydrochloric acid. 20.00mL of each solution is mixed. 20.00mL of acetic acid and 30.00mL of NaOH are mixed...

Homework Statement The question asks, how many of the following statements is/ are correct. I want to know which ones are right (I don't know the answer, but I will give a guess). BaCl2 added to an HCL solution does not change the pH NaBr added to an HBr solution will raise the pH. NaC2H3O2...

Oh so I got it now: v-4v'=5vfcosθ and v+v'=5vfsinθ and if you solve that system you get v = 5/2vf(sinθ+cosθ) and v' = 5/8vf(sinθ-cosθ) I took into account the -i when making my equations so there was a +4v' in the first equation instead of a -4v'. Apparently the (j-i) just represents direction...

Oh ok thanks, however if I do discard the i's or j's the v/v' will still cancel out and I'm left with 5vfcosθ=5vfsinθ

Wait what do you mean I can't subsitute vector comonents with vectors? v1x is the x component and v1y is the y component. And i is like the x component of the v1 vector and j is like the y component of the v1 vector

Homework Statement Two balls with mass m and 4m collide at the location x=y=0 and stick. Their initial velocities just before the collision can be represented as v1=(i+j) v and v2=(j-i)v' respectively. Their final velocity vf makes an angle θ with the +x axis. Find v and v' in terms of vf and...

Oh oops, it should be sin of 68 not cos, and thanks for the help!

The hinge on which the rod pivots is the point I used for the origin. Oh, so the board is like the radius and the force is like the cable, which in that case, the angle should be 47,not 25.

Yes, the setup shown above is correct, and sorry the origin axis I was using was the wall. I got 44(L/2) for the weight because the rod weighs 44 N and from the center of the rod to the pivot point is L/2. So I guess that means I need to multiply that by cos(68)? I multiplied the sin(25) with...

Homework Statement There is a lever rod of length 3.43 m, weight 44 N and uniform density. The lever rod is pivoted on one end and is supported by a cable attached at a point 0.902 m from the other end. The lever rod is in equilibrium at angle of 68◦ from the vertical wall. The cable makes...