Recent content by splinter

Used KEi = PEf, solved for KEi and PEf, got KEi = .2186M, and PEf = 9.81MH. Since KEi = PEf, .2186M = 9.81MH, the mass on each side cancel out, so .2186 = 9.81H, then solve for H, i got .0223 meters, then divide that by sin(27) to get the value of the hypotenuse, which gave me .0491 meters for...

Coin Rolling Up Incline, no mass given!? 1. [SFHS99 8.P.46.] A coin with a diameter of 3.40 cm rolls up a 27.0° inclined plane. The coin starts with an initial angular speed of 55.0 rad/s and rolls in a straight line without slipping. How far does it roll up the inclined plane? Having some...

Btw to find the time it took to slow to a stop, i used the kinematic equation Xf = Xi + 1/2(Vf+Vi)t

ok, so I used -1/2mVf^2 to find the work done on the divers body, and got -5867.6 J. Then, since W = Fd, I divided the work done by the distance over which it was done, and got -1173.5 N. Tried both positive and negative of that, but online homework is still telling me its wrong!

Having trouble with this problem: 3. [SFHS99 5.P.37.] A 50.0 kg diver steps off a 12.0 m high diving board and drops straight down into the water. If the diver comes to rest 5.0 m below the surface of the water, determine the average resistance force exerted on the diver by the water...

Whoops it was work done by gravity...easy just mgd. doh! Thanks for the help i got them all now.

Didn't see your new post and edit, might be able to get it with that.

ok I've gotten the Fapp and the Fn, now I'm just having trouble with the Ff. I used the equation Ff = uN, plugging in my normal force of 194.5 and u of .3, then multiplied that by 3.1 to get work, and entered the negative of that, but it's still telling me its incorrect. Don't understand what...

Ok so I tried taking the gravitational force, 54.96N, and finding the horizontal component of that. I drew it as a triangle with 54.96N as the y leg, then did 53.96/tan 30 to find the x leg of the triangle. This gave me 93.46N, which my online homework is saying is wrong! Still confused =\

Hey everyone, my first post here, hope it's ok that it's a question... I've got this physics problem that is absolutely stumping me, is abnormal from all the other forces problems I've done before, and uk is throwing me for a loop too...here it is: 6. [SFHS99 5.P.60.] A 5.5 kg block is...