I just wanted to say thanks to everyone who has looked at this. I have been impressed with the discussion, especially that some of you were willing to try the experiment.
I absolutely agree with everything here.
Let us say that it was a perfect experiment. I assume you should get lost mass without boiling? Do the molecules that vaporize reach 100 C or are they just the molecules with enough energy to break the intermolecular bonds keeping them liquid?
Ok. I might have been simplifying values so I actually looked at a student's lab.
Most students only lose 2-3 grams of water for an initial 200 grams. This only accounts for about 10% of the energy absorbed by the water.
There is energy being transferred to the water, both to change the temperature and change the phase of the evaporated water.
The question is really about weather the water that evaporates really reaches 100 ℃. For example: The water heats to 80 ℃ and 10 mL of water are lost. Does the 10 mL...
High School Physics Lab: Take 200mL of water (Room temp) and place it in a microwave on high for 60 seconds. Calculate the Energy transferred to the water by the microwave.
Pretty easy:
Step 1: Heat of Temp Change : Q= mC∆T where m=200mL
Step 2: Add Heat due to phase change: Q=mL where m=...
It alligns with the magnets but then does not spin. It seems like it would just spin fliping the polarity of the electrical current but it behaves exactly the same.
I am building a St. Louis Motor for a project in my AP physics class. I followed the directions the best i could and my physics teacher said it looked good but it does not seem to work. I tested it for continuity and it looks good. My math teacher thought that maybe the neodymium magnets i am...
Homework Statement
Figure 7-40 shows a cord attached to a cart that can slide along a frictionless horizontal rail aligned along an x axis. The left end of the cord is pulled over a pulley, of negligible mass and friction and at cord height h = 1.6 m, so the cart slides from x1 = 4.0 m to x2...
your logic is good (except I don't get your second 1/2mv2).
You are right about centripital force. At the top the ball needs enough velocity so that its centripital inertia= its weight. The force of gravity must equal its centripital force. This will translate directly into an equation...
You are fairly close to understanding what is going on. If you throw the projectile straight up, it will have zero velocity at the top but the acceleration will always = 9.8 m/s/s downwards.
First it is only stationary (v=0) for a fraction of a fraction of a second.
Second it has an...
Homework Statement
There is a car of mass 1900kg that travels at a steady speed of 27 m/s up and down a hill. The force of friction is the same in both directions and it takes 49 more horsepower to go up the hill than down the hill. What is the inclination of the hill.
Given: mass of...
Listen to Doc Al and Jakell.
When your scale reads 70 kg what it is really doing is weighing 686N and just dividing by 9.8m/s2 and giving you a reading in kg. It assumes your mass from your weight becuase the kg it is a usefull unit.
In your post you mentiong 70 kg. Now on Earth that will...
I don't know a ton but I do know that what is usually measure is not fps but rather the speed at which you start to see movement as non-continous. This is about 60 Hz. Anything giving off light faster than that will apear to be continous. Therefore anything changing withing that region will...
I understand the basics of color theory and I need to explain it to some graduate level bio-students. Now I need to incorporate the biological funciotions involved in this process and relate it to avian species. Now I have a brief understand of the human eye abosorbtion curves which peak at...
still way to hard.
PE of a spring is equal to 1/2kx^2 where x is distance from equilibrium and KE is 1/2 mv^2. An oscilator is just a system that conserves energy. At one extreme (your initial condition) There is only potential energy of the spring because the object is at rest (it is...