Recent content by yandao87

any one can tell me if the answer for part b is the same as part a? i managed to solve only part a..

yes I've solved it. thank you. i need to use triangle geometry.

is the answer for part b same as that for part a? I'm stuck at b. :)

Homework Statement A quarry crane is used to lift massive rocks from a quarry pit. Consider the simplified model of such a crane shown in the figure. The ends of two poles are anchored to the ground at the same point (point O). From this point, one pole rises vertically and the second pole...

thank you so much once again. :)

oh! i kind of get what you meant. so now, i have post collision at top = 5.6m/s so, 1) at the top, it has k.e. of 0.5(16+5.5)(5.6)^2 and p.e. of (16+5.5)(9.8)(3.2*2) 2) solve for v using k.e. at bottom of 0.5(16+5.5)v^2, p.e. =0 3) i'll get v at bottom of 12.52m/s then 1) using...

hi thanks thanks so much for the reply. i understand that for the first part, it should be T+mg = mv^2/r , but T= 0 as assumed. but for the 2nd part, i'm using v=5.6 at the top for final p. i don't get what you mean by that i should use the speed at the bottom instead. isn't that what I'm...

ok, but any idea how i can approach this problem??

Homework Statement A 16.00 lead sphere is hanging from a hook by a thin wire 3.20 long, and is free to swing in a complete circle. Suddenly it is struck horizontally by a 5.50 steel dart that embeds itself in the lead sphere. What must be the minimum initial speed of the dart so that...

thanks for the help. i finally got it. its 1/6 mv^2