Question

Can you guys check my work please?
Let me upload the picture in a bit.

Answer 1

My work agrees with the given answers I'm just wondering if I it right ;/

Answer 2

*did it

Answer 3

http://assets.openstudy.com/updates/attachments/552d7406e4b0cb495175b82e-luk20_20-1429042275703-work.png

Answer 4

ok so we want the final momentum yea?

Answer 5

yep

Answer 6

you are right according to my calculations

Answer 7

cool ty

Answer 8

well the answers were given I just needed to show my work. and my answers agree with the ranking! :D

Answer 9

my only issue is that it should be \(\rho_i+\rho_f\) You don't lose initial velocity

Answer 10

for C it was suppose to be 10 x 75 with i didn't appear in the picture

Answer 11

let me double check though

Answer 12

isn't change in momentum pf - pi ?

Answer 13

but we don't want change, we want final

Answer 14

:O

Answer 15

my previous statement was incorrect though about how to calculate it

Answer 16

you need to determine the total velocity after the force is applied

Answer 17

http://www.physlink.com/Education/AskExperts/ae462.cfm

This explains what I fudged up in explaining

Answer 18

let's see

Answer 19

so, though I think you may have done this correctly now, my issue is that because you didn't define each thing you plugged in, I would take points off

Answer 20

can you show me how you would've done it if you don't mind pls? :D just for the first scenario

Answer 21

also, don't write dt. It looks like calculus when you do, which is why I misunderstood your formula. You can do just t or \(t_{total}\)

Answer 22

ok that's how our professor wrote it yesterday

Answer 23

(ewwy, I don't like that \(\Delta t \) would be better ) so anyways I'd go \[mv_i=\rho_1 \\F*t=\rho_2\\\rho_1+\rho_2=\rho_f\] Then for each problem, I would have Given written, and define my \(F,t,m,v_i,\rho_1=?,\rho_2=?\rho_f=?\)

Answer 24

then I would solve using the equations above.

Answer 25

now, you did just use the combination of these by turning it into a sum of all forces =ma, so it is correct and can be used.

Answer 26

but points are removed if the given are not listed in any class I have taken

Answer 27

hmm i see

Answer 28

so, in general your work is acceptable now that I see what you are doing, but I would still write down where you got your numbers from and what they represent.

Answer 29

I see I still get the same answers :D

Answer 30

yea, the ways are actually the same, but two approaches

Answer 31

yep I just realized the same thing!

Answer 32

thanks a lot though hey I got another question if you don't mind

Answer 33

np, i actually have to go to class, but there are a few people who can help you on. Good luck!

Answer 34

thanks good luck to u as well!