Recent content by physicnow

Hi Dick, I wonder "Calculate the energy required to increase the temperature of this diatomic gas by 2 degree celsius. Assume it is heating at constant pressure and use Cp=7R/2." They asked for the energy required to increase the temperature of this diatomis gas by 2 degree celsius. I got...

Thanks Dick, that's problem I couldn't solve for the number of moles. I know the formula PV=nRT, the problem here, how can I find P & R? P is constant? T is 275 right? or Delta T is 275, make me confuse... the answer is:118KJ,236KJ,354KJ,472KJ I don't get any the right one. please help

I have an problem that can not solve, any help would greatly appreciated. A house has well-insulated walls.It contains a volume of 100m3 of air at 300K. Calculate the energy required to increase the temperature of this diatomic gas by 2 degree celsius. Assume it is heating at constant...

Thanks I figured it out already.

I got this problem and I got the answer 0.5 rad/s^2, but it is not the right one. pls help me. thanks At t=0 wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2 rad/s. Two seconds later it has turned 5 complete revolutions. What is the angular...

I have this problem, but I could not understand. pls help Steam at 100 degree celsius is added to ice at 0 degree celsius. The mass of the steam is 10 g and the mass of the ice is 50.0 g. What is the final temperature of the mixture? thanks a lot.

Thanks Thank for reply, Astronuc, I have a question, you said Q=V*A, V=velocity, but in the problem, it does not give velocity value, how do I get it. Thanks again.

Pls help on this problem that I can not solve it. a room measures 3.0 m by 4.5 m by 6.0 m. The heating and air conditioning ducts to and from the room are circular with diameter 0.30 m, and the air in the room is to be exchanged every 12 minutes. What is the necessary flow speed in the duct...

Hi, I have an problem that I can not get the answer, any help would be greatly appreciated. An archer shoots an arrow with a velocity of 45m/s at an angle of 50 degrees with the horizontal. What is the height of the arrow at a point 150 meters downrange?