Recent content by ch010308

I tried to derive the answer from the hints given in that thread but I still got it wrong. :( There's also another part to the question: Find T1, the tension in rope 1. Please help!

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...

oh shoot! I can't believe I made tt mistake again n again. :-p Thanks for pointing it out! ok, i think i get it. change in KE of bullet = 1/2 m(vf2 -vi2) = (1/2)(5/1000)(1002-4002) = -375J change in KE of spring = (1/2)(1)(1.52 - 02) = 1.125J total change in KE = -375 + 1.125 =...

Homework Statement A 5.00-g bullet moving with an initial speed of 400 m/s is fired into and passes through a 1.00-kg block, as in Figure P9.67. The block, initially at rest on a frictionless, horizontal surface, is connected to a spring of force constant 900 N/m. If the block moves 5.00 cm...

ooohh! I got it now! Thanks for the help! :)

hmmm... Are you saying that i should use m*a = Δmv/Δt for the change in momentum of the rocket? then wat will be the value of m? :confused:

Homework Statement A rocket is fired in deep space, where gravity is negligible. In the first second it ejects 1/160 of its mass as exhaust gas and has an acceleration of 15.9 m/s2. What is the speed vgas of the exhaust gas relative to the rocket? Express your answer numerically in...

I can solved the question already! Thank you all for helping! :smile:

Homework Statement The ends of two identical springs are connected. Their unstretched lengths l are negligibly small and each has spring constant k. After being connected, both springs are stretched an amount L and their free ends are anchored at y=0 and x= (plus minus)L as shown (Intro 1...