Recent content by Bgerst103

The density of air at room temp is about 1.2 kg/m3 so mass would be M=DV so I guess the mass is just 1.2 as well? Gravitional potential energy is just PE=mgh correct? So then, 1.2(9.8)(100)=1176 meaning thermal energy is much greater than gravitational.

Thermal energy in one cubic meter of air Homework Statement How much thermal energy was in 1 cubic meter of air at room temperature. Give your answer in Joules. How much kinetic energy does one cubic meter of air have if it were to hit the ground after falling 100 m? Give your answer in...

So, there are about 2.5 x 10^25 molecules in 1m3 of air. K is 1.381 x 10^-23. I've decided to use 293.15 K as my temperature. So the kinetic energy of one molecule is 6.0726 x 10^-21. So do I multiply this by 2.5 x 10^25? That would come out to 151815. If this is right how would I turn this into...

Homework Statement Estimate your walking speed assuming that your legs are ideal PHYSICAL PENDULA. Estimate your walking speed by measuring how long it takes you to walk 10 m. Was your "pendulum" walking speed faster of slower than your "clocked" walking speed? Why? Homework...

Homework Statement How much thermal energy was in 1 cubic meter of air at room temperature. Give your answer in Joules. How much kinetic energy does one cubic meter of air have if it were to hit the ground after falling 100 m? Give your answer in Joules. Which has more energy...

Homework Statement You have a sealed piston with a VERY LIGHT and moveable top that can easily slide up and down without friction. It starts at room temperature with 1 kg of water in the bottom. You heat it, boil the water, and further heat the water until it is at 150°C. Determine the...

I'm leaning towards 2 since the top and bottom block aren't in direct contact.

Homework Statement Three blocks are stacked on top of each other. How many forces are on the bottom block? a. 0 b. 1 c. 2 d. 3 e. 4 Homework Equations The Attempt at a Solution I know this is a very simple question, I just feel like it's easy to tricked. Obviously gravity...

Care to give me the right equation to use then? I saw moles and assumed pv=nrt. Is it mass over density?

Homework Statement You have a sealed container with 2 kg of water (molar mass: 18 g/mol, density: 1000 kg/m 3). The lid on the the container is very light, and the container side walls are very tall, like a tall graduated cylinder. You start with the water at room temperature 25 degrees C...

E=(.00025)(2260) -> E=.565 -> .565/1=.565. Hows that look to you?

Homework Statement Water's heat of vaporization is 2260 kJ/kg. How much power would you need to apply to water so that the evaporation rate was .25 g/s? Homework Equations Not sure The Attempt at a Solution What equation can be used to find the given rate?

So, 75 x 60 is equal 4500. 4500= (.1kg)(L) -> L=45000. If it takes 1 minute to vaporize 100g it should take 10 minutes for a kg and 45000 J?

Homework Statement A scientist heats up a substance by applying heat at a constant rate of 75 J/s. She measures that it takes 1 minute for 100 grams of the substance to evaporate. What is the latent of vaporization of this substance? If she starts with 1 kg of the substance, how long...

Trust me I found out the hard way. Had to do 125 problems, have 5 left, all thermodynamics, this being one of them.