Recent content by Dmitri10

Okay, nevermind. I think I actually got all the rest of them!

Okay, great. Thank you! I might have someone look over another question or two... so stay tuned! Haha

Here's a problem. A house fly accumulates 3.0 (10)^-10 of positive charge as it flies through the air. What is the magnitude of the electric field at a location 2.0 cm from the fly? Here's what I think. I should use the equation E = kq/d^2. I am trying to find E. k = 9.0 (10)^9 q = 3.0...

Oh! Yes, 30 J was a typo; I actually used 36 J. Thank you for checking my work though!

Awesome! Thank you both.

"Pounding an nail into wood makes the nail warmer. Consider a 5-g steel nail 6 cm long, and a hammer that exerts an average force of 600 N on it when driving the nail into a piece of wood. About how much hotter will the nail become? (The specific heat capacity of steel is 450 J/kgC.)" Here's...

If a steel tower stands 300 m tall on an average day, 22 degrees C, how much taller is it on a hot day, 40 degrees C? The coefficient of linear expansion for steel is 11 (10)^-6/degree C. The equation for change in length of a material is (change in L) = L * α * (change in T) I know...

Okay. I cannot believe I didn't realize that before I asked. Haha how embarrassing... anyway, thank you very much for your help.

Okay. That's what I presumed; that it didn't matter as long as units were consistent. Thank you for your help, though. Hopefully my last question: is the change in temperature for the metal 2 degrees?

And... since the metal caused the water's temperature to increase by 2 degrees, does the metal's temperature decrease by 2 degrees?

Okay, thank you. That leads me to another question, perhaps a silly one. How do I know when to use the 4.18 value instead of 1 cal/gC for water's specific heat capacity?

"What is the specific heat capacity of a 50-gram piece of 100 degree C metal that will change 400 grams of 20 degrees C water to 22 degrees C? Could someone please explain to me how to do this problem? I have to figure it out on my own because my teacher is no help at all. Thanks in advance.

"What would be the final temperature if you mixed a liter of 20 degrees C water with 2 liters of 40 degrees C water?" My teacher assigned us several problems like these without bothering to explain them. I have a hunch that they are embarrassingly simple to complete, but I know not how to...

Your logic is sound. Thanks for the help!

No... the mass of the system doesn't change. That's what I initially thought, but then I proceeded to confuse myself by trying to reason that if something were suspended in a liquid, the liquid exerts an upward buoyant force that balances out the downward force of gravity. If the downward force...