Recent content by ncote

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1. A solid cylinder (radius = 0.150 m, height = 0.120 m) has a mass of 6.90 kg. This cylinder is floating in water. Then oil ( = 725 kg/m3) is poured on top of the water until the situation shown in the drawing results. How much of the height of the cylinder is in the oil? 2...

so i have this: Fb=(W) fluid displaced. and for the ice in a glass---- (V)ice=(V)displaced fluid. (m)ice above surface=(m)(v of water)-(m)ice below.

1. My professor gave us an extra credit problem in which we have to prove that water level does not change when ice melts. [b]2. (v)ice=(v)displaced water [b]3. any ideas?

i got it! i used W-Wnc=Wc and got the correct answer for the change for the hieght i just did W-Wnc/mg.

i got W using (1/2)(m)(vf^2)-(1/2)(m)(vo^2). not sure where to go from here.

1. A 55.5 kg skateboarder starts out with a speed of 1.75 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the skateboarder is...