Recent content by anelmarx

Homework Statement A wrecking ball weighing 4800N is supported by a uniform boom of wieght 3600N. A support cable runs from the top of the boom to the tractor. the angle between the support cable and the horizontal is 32degrees and the angle between the boom and the horizon is 48degrees...

Homework Statement Consider a bullet of mass m fired at a speed of Vo into a wooden blcok of mass M. The bullet instantaneously comes to a rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic friction U. How far does the...

Wow! thank you so much for your help, I have been struggling with this for hours and hours.

Ok, think I might have figured it out: PE=KE mgh=mv*v/2 m falls away so gh=v*v/2 and g = 9.81 so 9.81*1.5*2=v*v v=5.43m/s then ang speed=v/r=5.43/1.5=3.61rad/s and to find ang acc: 90degrees = pi/2 and s=r*pi/2=1.5*pi/2=2.36m so 9.81m/s*((pi/2)rad/2.36m)=6.53rad/s

Ok now I am really lost. I am studying online and do not have anyone to ask - lecturer not resonding:frown:. If I use v*v=v_o*v_o+2ax and a=-9.81m/s*s and x=1.5m then v*v=0+2*-9.81*1.5 but then you cannot take the root of a negative? OMG I am just so frustrated

Homework Statement A thin rod of length 1.50m is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod may be ignored compared to the mass of an object fixed to the top of the rod. The rod, starting from rest, tips over and...

The U is definitely for kinetic energy. That's why I don't know where it is suppose to fit in.

Homework Statement Consider a bullet of mass m fired at a speed of Vo into a wooden block of mass M. The bullet instantaneously comes to a rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic energy U. How far (s) does the...