UTexas HW7 #17

I might know how to start it, but I am completely winging it. Can anybody help me?

UT HW7: #15

I got 14, and I thought this was an energy problem, so I did mgh=1/2mv^2, but it didn't work. What should I be doing?

uTexas HW7 #18

I got question 17, but I don't see how we're supposed to find the maximum compression without knowing the spring constant. Can anyone help me out?

Texas HW6B #s 19 and 20

I am very confused on how to even set up these ones. I need some help desperately.

UT HW6B: #9

No idea how to even start this or go about doing it....

Last Question: 15 on the UT HW6

Ok. So, I got the first answer and I know I got the height right since the 1st part is correct. But I don't know how to set up an equation for this one. This is my last question for the hw.

UT HW6 #s 18 and 19

I am confused on how to do these ones. I got 17 but I am not sure how to use it in the next questions.

UT HW6 #12 and 13

I am really stumped on these. Can anybody help me out?

UT HW6 #16

I tried using the equation U1=K2, or mgh=1/2kx^2, but it didn't work. I'm confused about how to find the height and where the angle comes into the problem, and how to figure it out?

UT HW #18

I am very confused on how to do number 18. I already took 5 tries! HELP! This is my last one!

HW5 Number 7

Number 7 is really throwing me off, can anybody help?

UT HW5 #6

I got the first answer, but I am confused on how to get the second part asking for the speed of the 2nd sled. Can  any body help me with this?

UT HW5 # 17 and 18

I got number 16 but i dont know how to do number 17 and 18. Help ?

UT5 #8

I tried to find the acceleration by doing F=ma, a=F/m by finding the force in the perpendicular direction, and using the mass that was given. What am I doing wrong and how can I get the answer

UT HW5 #5 ?

Did anyone start this question...me and Vicky are working on it and are a little confused on how to set it up.

HW5 Question 14/15

has anybody worked through this problem yet and can have any suggestions about the best way to go about it?

MP1 extra credit opportunity

For +2 HW points for the 1st marking period:
Attend a talk at 5:30 on Tuesday Oct 4 at the Simon Center at Stony Brook University. Say hello to Dr. Winters to get credit for being there!

Brian Greene (a famous physicist) will be giving a general talk to the public called "Reaching for Einstein's Dreams". He is a good speaker and "high school students ... are especially encouraged to attend".

A link to the information is here: http://scgp.stonybrook.edu/archives/1735

If you go, get there early so you can find the place, and somewhere to park. If you can't go, don't panic. There will be other extra credit opportunities.

UTexas HW4 #s 1, 5 and 15.

I thought I knew how to set these up by looking at some of the other posts and our notes, but I couldn't get an answer. Can anybody help me with these?

UT HW 4 #7

I've used three tries on this one already and I have no clue why any of them are wrong. I drew an upward force equivalent to the light fixture and used the SOH formula. Does anybody know what am I doing wrong?

UT HW4 Tension problems

I'm kind of confused with the problems relating to tension of wires. How do you find the tension with the angles? I kind of remember the problem in class with the monkey hanging from the vines but I don't remember how to set it up. Can anybody help?

Question 7

I think I know the answer to this already, but am I looking for the force in each wire, or the total force between the two?

# 16 and 17

I am trying to figure out how to set this problem up. I know its similar to # 7 but i am confused because I don't know how to do it since the to two cables have different angles.

HW4 #5

I found all my components: xo=0, x=51.7, vo=0, and a= 9.8. First, I used to v^2 formula to find v, but that did not work. Then I found a using N=ma formula. I took the acceleration from that formula and plugged it into the v^2 formula, and that answer was also wrong. Does anyone have any ideas what I'm doing wrong?