Recent content by fordy314

Homework Statement An ice cream cone has 290 Calories. Assuming the temperature of your skin is 32.7 C and the temperature of the air is 19.9 C, how long (hours) will it take to radiate away the energy of the ice cream cone. The emissivity of the average body is 0.915 and the average surface...

Thanks so much. Of course its always that units that'll get me.

Ok, then F[SIZE="1"]Piston1=PA[SIZE="1"]1=37.9N 37.9N-(.085kg*9.81m/s^2)=37.1 Now do I want to use the equation F[SIZE="1"]1*d[SIZE="1"]1=F[SIZE="1"]2*d[SIZE="2"]2? That would be (37.1*.0447m)/.164m=10.1N, but my answer comes up wrong. Any suggestions?

Pascal's principle hydraulic lift with torque involved(need help with lever) Homework Statement A hydraulic jack is used to support a mass which has a mass of 30.7 kg. The mass is supported by piston 2 which has a mass of 0.250 kg and an area of 40.2 cm2 . A force is applied by the lever on...

Ah, right, I forgot about the signs. Looks like the summer off has made me a little rusty. I just accounted for the signs and got the right answer. Thanks for your help.

Homework Statement A converging lens with a focal length of 14.2 cm is used to inspect a coin. The lens forms a virtual image 30.1 cm away. What is the magnification? Homework Equations (1/Si) + (1/So) = (1/f) M = (hi/ho) = (-Si/So) The Attempt at a Solution 1/So = 1/f - 1/Si...