Recent content by julz3216

I have the same problem on my physics homework, the only difference is that the spring constant is 1300, the spring is compressed 14cm and the coefficient kinetic friction is .22. I found the velocity to be 11.225 m/s I know W=FD = (F*uk)D = mgcos45*uk*h/cos45 =mgh*uk = .8624 I tried to...

So I tried to do F*change in t = change in m*v but it didn't work. i calculated velocity by doing change in d/ change in t. i used 2.5 for t because that is where fmax occurs and i also used d as 1.8 because that is the distance the ball travels in 2.5 seconds so i got v=.72 and then mv=.029...

ok so i got a and b a. t=.00021 b. average force = 35714.286 but I still don't know how to get part c...I thought maybe it would be 300 because that is the speed the bullet lost in the target but that is wrong. any help??

The graph doesn't provide F values so for area i got ((6+2)*Fmax)/2 For impulse I got .06*33 = 1.98 ...(60 g is right -> .06 kg) But, I don't know what you mean by dividing the impulse by the ms factor?

Homework Statement In a ballistics test, a 25.0 bullet traveling horizontally at 1100 goes through a 20.0 -thick 450 stationary target and emerges with a speed of 800 . The target is free to slide on a smooth horizontal surface. a.How long is the bullet in the target? b. What average force...

Homework Statement A 41 rubber ball is dropped from a height of 1.8 and rebounds to two-thirds of its initial height. http://session.masteringphysics.com/problemAsset/1070447/4/09.P29.jpg The figure (Part C figure) shows the impulse received from the floor. What maximum force does the...

Homework Statement A 60 tennis ball with an initial speed of 33 hits a wall and rebounds with the same speed. The figure (Intro 1 figure) shows the force of the wall on the ball during the collision. t=6 http://session.masteringphysics.com/problemAsset/1070440/4/09.EX11.jpg What is the...

I think v = omega*r Where v is the velocity, omega is angular speed (rad/s), and r is the radius. so v= 4.71r then (4.71r)^2/r= 22.18r = 1.8228 so r= .082 which is right! thank you!

Ok, I got it! Thank you so much.

mv^2/r =usmg v^2/r = usg (4.71^2)/r <= .186g 22.184 = 1.8228r r= 12.17 This seems logical to me but it says it is wrong.

I tried both ways but neither options were correct. I think it is supposed to be in m/s and I think my answer is wrong in general, is there anything else I can do to get another answer?

Homework Statement A coin is placed on a turntable that is rotating at 45.0 rpm. If the coefficient of static friction between the coin and the turntable is 0.186, how far from the center of the turntable can the coin be placed without having it slip off? Homework Equations mv^2/r <=...

I tried and got 24.705 but that was wrong. Are there any other ways to approach the problem?

Oh ok, that's what I did wrong. I got it. Thank you!

Homework Statement A train traveling at a constant speed rounds a curve of radius 218 m. A lamp suspended from the ceiling swings out to an angle of 16.6° throughout the curve. What is the speed of the train? Homework Equations mv^2/r The Attempt at a Solution I drew a...