Recent content by nlingraham

Homework Statement A snapnium-loaded toy launcher shoots a 22 g plastic ball. What is the launch speed if the snaptastic constant is 4.6×104 N/m3, with the units you found in part A, and the piece of snapnium is compressed 14 cm ? Assume the barrel is frictionless. OTHER INFO: A...

Thank you very much

Homework Statement Dust particles are 13.0 micrometers in diameter. They are pulverized rock, with ρ=2540 kg/m3 . If you treat dust as an ideal gas, what is the rms speed of a dust particle at 18.0 C? Homework Equations ρ=m/v V=4/3∏r2 vrms=√(3kT/m) The Attempt at a Solution...

So I think sometimes I may be retarded. So it should have been ∏r2+2∏rh. I got the correct answer now. Thank you

So would the SA just be SA=2∏r+2∏rh since the cylinder doesn't have a bottom? Which would make the SA = .754 m2, Which would give an answer of 125.5 W?

Homework Statement Much of the of heat lost from a cross-country skier's body is radiated from the head, since it is often uncovered. Treat a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. If the surface temperature of a body is 35 C, what is the net rate of heat loss on a...

Well, I feel stupid now. thanks.

*Messed up title, should have been find initial temp of copper* Homework Statement 8.00 g of aluminum at 200 °C and 18.0 g of copper are dropped into 50.0 cm3 of ethyl alcohol at 15 °C. The temperature quickly comes to 26.0 °C. What was the initial temperature of the copper? Density of ethyl...

Ok, I got it. J=kg*m2/s2. So that meant I had to convert 80 km/h to 22.22 m/s for everything to cancel out. I ended up getting .55 C. Thank you for your help.

Homework Statement Two cars collide head on while each is traveling at 80 km/h. Suppose all their kinetic energy is transformed into the thermal energy of the wrecks. What is the temperature increase of each car? You can assume that each car's specific heat is that of iron. Homework Equations...

Thank you for your help!

Ok, I think I got it. So it would be P2V2γ=P1V1γ and then just solve for P2

Ok, I get the PVγ, where γ=5/3 since its a monatomic gas, but what exactly is the constant? Is that supposed to be nR?

Homework Statement The figure(Figure 1) shows a thermodynamic process followed by 150 mg of helium. Determine the pressure (in atm) at points 1, 2, and 3. Determine the temperature (in °C) at points 1, 2, and 3. http://imgur.com/B7lwQ n=.0375 mol P1=3 atm P2=1 atm T1=971.85 k T2=971.85 k...

Thanks, you guys are awesome