All categories - 11 October 2006

Physics Phrustration...?
A 67.9kg skier coasts up a snow-covered hill that makes an angle of 27.7o with the horizontal. The initial speed of the skier is 8.54m/s. After coasting a distance of 1.94m up the slope, the speed of the skier is 3.15m/s. Calculate the work done by the kinetic frictional force that acts on the skis.

You are on the right track. Two things remove energy from the skier: frictional force and change in potential energy due to elevation change. The elevation change as you said is ∆h = S*sin(T) where T is the angle of the slope. The energy change from this is m*g*∆h. His starting energy is .5*m*v0^2 where v0 is the starting velocity. The ending energy is .5*m*Vf^2.

The relation is:

end energy - start energy = ∆potential energy + friction energy.

my equation comes out to...

used change PE = mg(hf - hi)
to get 600.07

336.87 - 2476.03 = 600.07 + frictional force

I get -2739 as an answer, but it is still wrong.

2006-10-11 20:42:22 · 1 answers · asked by CarpeDiem22 1 in Homework Help

2006-10-11 20:42:17 · 12 answers · asked by Anonymous in Other - Beauty & Style

I Loved That Movie!.it Was So Cool!

2006-10-11 20:41:44 · 10 answers · asked by Anonymous in Movies

give your life to christ? Also if you believed christianity was true?

2006-10-11 20:41:43 · 15 answers · asked by Anonymous in Religion & Spirituality

I'm not asking if Al Pacino at the present time, looks like Jake Gyllenhaal.
I'm just asking if he really looks like J.G. in the film alone. (The Godfather pt.!)

2006-10-11 20:41:38 · 4 answers · asked by Anonymous in Movies

2006-10-11 20:41:29 · 8 answers · asked by Mere Mortal 7 in Religion & Spirituality

from where to where.

2006-10-11 20:41:28 · 15 answers · asked by JustJane 6 in Polls & Surveys

2006-10-11 20:41:16 · 5 answers · asked by Hey Polly 5 in Polls & Surveys

1907 - The Founder of the Boy Scout Movement, Robert Stevenson Smythe Baden-Powell started Scouts. (Scouting is a game with a purpose)

2006-10-11 20:40:58 · 8 answers · asked by redcoat7121 4 in Other - Games & Recreation

2006-10-11 20:40:44 · 15 answers · asked by Anonymous in Jokes & Riddles

2006-10-11 20:40:35 · 51 answers · asked by end 1 in Weddings

2006-10-11 20:40:25 · 18 answers · asked by yudi kicks ass 3 in Wrestling

what is quantum theory. is it very complicated theory?

2006-10-11 20:40:19 · 10 answers · asked by sanjeev k 1 in Physics

2outa evry 3couples turn heads 2right when they kiss

Simple peck uses 2muscles.Passionate kiss uses all 34muscles in ur face.Rigorous workout!

Like fingrprints/snowflakes,no 2lip impressions r alike

Kissing is gud 4wat ails u.Research shows:act of smooching improves skin,helps circulation,prevents toothdecay,n can even relieve headaches

Average person spend 336hrs of life kissing

Wonder how “X” came 2represent a kiss?In MiddleAges,ppl who kudnt read used an X as signature.They would kiss ths mark as sign of sincerity.N,the X came 2represent the kiss itself

Talk about a rush!Kissing releases the same neurotransmitters in our brains as parachuting,bungeejumping,n running

Avrage woman kisses 29men b4 she gets married

Men who kiss their partners b4 leaving 4work average higher incomes than those who dont

Longest kiss in movie history:between Jane Wyman n Regis Tommey in 1941film:U r in the Army Now!It lasted 3min 5sec!If u'v beatn that record,its time 2celebrate!

2006-10-11 20:40:17 · 10 answers · asked by ky11 4 in Polls & Surveys

Look like gay porn actors? I know I'm probably confusing cause and consequence, but this is not so common in straight porn. I frankly wouldnt want to be naked in a shower whit 200 naked, well built soldiers.

2006-10-11 20:40:16 · 6 answers · asked by Diego A 2 in Lesbian, Gay, Bisexual, and Transgender

If you see a clown on the streets giving away free balloons will you go and take it? If you are alone maybe you would. I would. But if you are with a group of friends and everyone says that balloons are childish and you are the only one that wants a balloon will you take it??

2006-10-11 20:40:12 · 11 answers · asked by Balloon Guy 1 in Other - Games & Recreation

2006-10-11 20:40:12 · 11 answers · asked by lola a 1 in Fashion & Accessories

2006-10-11 20:40:08 · 13 answers · asked by Bharat N 1 in Friends

2006-10-11 20:40:08 · 2 answers · asked by marykt09142 1 in Homework Help

Will it thicken back up if you don't tie it away and you aren't under so much stress anymore. My hair was thick before.

2006-10-11 20:40:06 · 8 answers · asked by flyhigh 2 in Hair

Hai friends these maths problems shows 0=1=2=3=4=5= 6=7=8.... ......... ..infinity
if u think different u can get more wonders with numbers
Therm 1)
4==5
(4-(9/2))^2= =(5---(9/ 2))^2
(-1/2)^2==(1/ 2)^2
apply root both sides
then cancel squre both sides
1/4==1/4
so 4==5
-1 both sides
so 3==4
-1 both sides
so 2==3
as per a=b,b=c --------->a=c so
1=2=3=4=5=6= 7=8
Therm 2)
(-12)==(-12)
9-21==16-28
add 49/4 both sides
9-21+(49/4)= =16-28+(49/ 4)
3^2--2*3*(7/ 2)+(7/2)^ 2==4^2--2* 4*(7/2)+( 7/2)^2
it is a^2+b^2-2ab= =(a-b)^2
so apply this formula
(3-(7/2))^2= =(4-(7/2) )^2
apply root both side
and cancel squres
(3-(7/2))==( 4-(7/2))
so 3==4
Therm 3)
0==0
a^2-a^2==a^2- a^2
a*(a-a)==(a+ a)(a-a)
cancel (a-a) both sides
so
a=(a+a)
if a=1
1=2
Therem 4)
-20==-20
16-36==25-45
add 81/4 both sides
16-36+(81/4) ==25-45+( 81/4)
apply a^2+b^2-2ab= =(a-b)^2
(4-(9/2))^2= =(5-(81/4) )^2
finally u get
4==5

2006-10-11 20:40:02 · 7 answers · asked by rameshgavva 2 in Mathematics

2006-10-11 20:39:47 · 10 answers · asked by kcggrl 1 in Singles & Dating

If power stuggle becomes moto, social justice and human rights are ignored then is there any other way to stop third world war? I sense we will loose 2/3 of world populations if war starts.

2006-10-11 20:39:33 · 12 answers · asked by sereny12 1 in Sociology

2006-10-11 20:39:25 · 37 answers · asked by jake3782 1 in Cleaning & Laundry

old british t.v. show starring anthony newley

2006-10-11 20:39:11 · 2 answers · asked by michael r 1 in Television

Now for the sake of argument, you will tell me why I'm wrong and what can be done about it.

2006-10-11 20:39:04 · 15 answers · asked by Anonymous in Religion & Spirituality

Where can I do some practice trading (where I monitor real stocks but don't I don't put in any of my money yet)? I just "paper trade", but do it as if it is real online trading.

2006-10-11 20:38:47 · 9 answers · asked by Anonymous in Investing

The mobile phones even switch off even after 12 hours of train journe

2006-10-11 20:38:33 · 3 answers · asked by sreenath c 1 in Cell Phones & Plans

2006-10-11 20:38:26 · 2 answers · asked by jalaluddin s 1 in Other - Business & Finance