Recent content by R2D2

Got it! Thank you so much.

Thanks for your reply! This is where I got confused. So the current is toward east, and the direction of B is towards the northeast, and the angle is 24. So B and I form a angle of 66. - That's how I interpret the angle of dip. Is this wrong?

Homework Statement The power cable for an electric trolley (see figure) carries a horizontal current of 330 A toward the east. The Earth's magnetic field has a strength 5.0 ✕ 10-5 T and makes an angle of dip of24° at this location. Calculate the magnitude and direction of the magnetic force on...

anyone helps? : P

So Cv should be 5/2 R instead of 3/2 R! but I plug in Cv = 5/2 R I get 45.8 K as the answer, still not correct.. I don't know what is going wrong here with three degrees difference.

Yes I am kind of confused about which volume heat capacity I should use, since there are both monatomic and diatomic gas in air. For diatomic gas, the heat capacity is 5/2 R, but I don't know if I should use that.

Oh sorry! I forgot to add that the answer is 43.1 K.

Homework Statement An audience of 2750 fills a concert hall of volume 35000 m3. If there were no ventilation, by how much would the temperature of the air rise over a period of 2.0 h due to the metabolism of the people (70 W/person)? Homework Equations Q= nCvΔT Cv= (3/2) R The Attempt at a...