Recent content by skittlez411

you got it! area of a circle is PI(r^2)! The units are in metres not cm.

For #1, you got it. N/m is a spring constant unit. for #6, you can use this formula F1/A2=F2/A2. I hope that helps!

yay! i got it? thanks!

ok thanks austronuc and pcdagr8! i get that part now! a) Fk=Ukmgcos20 = 552.5N b) Fs=Usmgcos20 =828.8N so this is what i have right now.

hmmm... i still don't quite get it. i know how sine and cosine are. but i don't quite get the diagram... sorry!

can i ask why? i thought it's sine...:blushing:

ok... so i got a) Fk=ukmgsin20 = 201.11 N so if i get a running start i would be able to move the box up w/o assistance. b) Fs= Usmgsin20 = 301.66 N If i stop at the ramp, i will be able to get the box moving agian.. 301.66N<1000N is that it? thanks!

force! help me please =) Homework Statement It's moving day and you need to push a 100kg box up a 20 degree ramp into the truck. The coefficients of friction for the box on the ramp are Us=0.9 and Uk=0.6. Your largest pushing force is 1000N. Can you get the box into the truck without...

yahh i missed it here. i just double-checked my answer.

thank you guys so much! i really appreciate your help!

Homework Statement A 1200 kg car rolling on a horizontal surface has speed v=65km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2m. what is the spring stiffness constant of the spring? Homework Equations K(final)+Us(final)=K(initial)+Us(initial)...

ok...so this is what i got.. i hope I am right! (6.40*0)+(26*0)+(45*0)=(6.4+26+45)v(boat final) the answer is 0.

no i dont.. that's the thing.

the answer is the same...but what's the initial velocity of the package? is it 10m/s then? or is that the final velocity?

Homework Statement A child in a boat throws a 6.40kg package out horizontally with a speed of 10.0 m/s. Calculate the veolcity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.0kg and that of the boat is 45.0kg. Ignore water resistance...