Recent content by xxiangel

1. Cos x (sec x + cos x csc^2 x) = csc^2 x I got as far as this... 1 + cos^2 + cos/sin^2 = csc^2 2. tan x(sin x + cot x cos x) = sec x

Can someone help me work these out!? 1) A sound travels 1,047 meters in 3 seconds in air. Find the air temperature. (Answer 31.3 degrees C??) 2) A guitar string plays a fundamental frequency of 400 Hz. Find the frequency played if the string were twice as long and twice as tight...

One more question Andrew, you have been so hopeful already. How is water to steam considered vaporization in this problem? I thought water to steam was considered fusion, and steam to water was vaporization. Thats how the example problems are in my physics book. This has to do with Q4.

How much heat must be absorbed by 1 kg of ice at -20 degrees celsius to change it to steam at 130 degrees? This is the work that I came up with. Ice -20°C to Ice 0°C= q=mc(change in T)= 1kg x 2060 J/kg.Kx 20 degrees= 41200 J Ice 0 degrees to Water 0 degrees= Q= Hf x m= 334,000 j/kg x 1...

Temperature Problems... Confused! please help! How much heat must be taken away from 400 grams of steam at 200 degrees to change it into water at 100 degrees? (Teacher says answer is -985,000 J) How much heat must be absorbed by 1 kg of ice at -20 degrees celsius to change it to steam at 130...