Recent content by Puddles

Homework Statement A ball of mass m1 is aligned above a ball of mass M2 (with slight separation), and the two are dropped simultaneously from height h. (Assume the radius of each ball is negligible compared to h.) (a) If M2 rebounds elastically from the floor and then m1 rebounds from M2, what...

Okay, I think I found my error, I've worked out that v1i = (m2(1 - 2v2i))/(m1), how can I plug this back into check it? I'm struggling to find a way to do so but I know there must be a way…

Homework Statement An object of mass m1 traveling with velocity v1i has a perfectly elastic collision in which it rear ends and object of mass m2 (m2>>m1) traveling with velocity v2i. How must the velocity v1i relate to v2i if the mass m1 is to stop in its tracks (v1f=0)? What happens if...

Oh, wow. I forgot to put up the givens for my problem. I was waiting to substitute them in, sorry. u=.05, m1=15kg,m2=10kg, g=10m/s^2

Okay, I'm a little stuck. I got an acceleration a1 of 2.72, thus a2 is 1.36, t then equals 1.213, v1f = 3.3 m/s and v2f = 1.65 m/s. m1 will hit the ground first. However, I still don't understand how to calculate max possible friction for the system to still move, I just looked online for help...

Yup, I did. I went back and re-resolved F-tension for both parts. For F-tens. (m2) I have (m2a+m2g)/2 For F-tens. (m1) I have (m1g sin(37))-(u m1g cos(37))-(m1a) Does this look better? I think I've got it now but I'm just checking.

Okay, awesome. Thank you so much for your help! I really appreciate it.

Well no, I'd imagine there would be basically no energy lost, and that the reverse would be true for (i.), but I wasn't sure if it was necessary to show some kind of work behind this thought, maybe just plug in 10^5 vs. 1, or for a question like that is it unnecessary to prove this since it's a...

Homework Statement Given that a weight m1 is attached to a string going over a perfect pulley attached to another pulley suspending weight m2, and that weight m1 is on an incline with an angle of 37 degrees, find acceleration, tension, which mass hits the ground first, time needed to hit the...

Oh, right, thank you. Sometimes I fail to make simple connections in physics, I really appreciate your help. For (h.) and (i.) then should I just be treating M1 or M2 as zero depending on which part I'm doing because it's got comparatively insignificant mass to the other? So for (h.) for...

Okay, so then I've got... .5(M1 + M2)((M1V1)/(M1 + M2))^2 So then (f.) is... (.5(M1 + M2)((M1V1)/(M1 + M2))^2) / (.5(M1V1^2)), which can be simplified, cancel the .5's, a (M1 + M2), and (M1V1) Okay I got (M1)/(M1 + M2) How do I use that to get KEf in terms of KEi now? It's KEi times...

Homework Statement [/B] (a.)Apply the law of conservation of momentum to the perfectly inelastic collision of a moving object of mass m1 and velocity vi with a stationary object of mass m2 (b.) Solve this for final velocity vf (c.) Write a formula for the initial kinetic energy (KEi) (d.)...