In 2013-2014 our second day of no school because of cold weather. The below was done in the 2012-2013 school year.
If you missed today:
We did the Mechanical Equivalent of Heat Lab
This is a lab we did as a class and was a 10 point quickie lab. You can use the data from your class below to complete the lab.
The purpose of the lab was to do work by twirling a pvc pipe, with lead shot in it, 100 times and measuring the temperature of the lead shot before and after the 100 twirls. All our work (W = Fs) turned into an equal amount potential energy ( P. E. = mgh) which turned into kinetic energy as it fell until it was all kinetic energy (K.E.= 1/2 m v^2) and finally this lab was to prove that all the energy lastly turned into HEAT energy ( Q = cmT).
So we figured out the Work in Joules using ( W = F s = Weight X s = mgh) and then the Quantity of Heat in calories (Q = cmT) finally taking the ration of the Joules over the calories to obtain what is called the Mechanical Equivalent of Heat because it is the conversion for how many joules in a calorie.
A calorie is defined to be the amount of heat required to raise the temperature of 1 gram of water 1 degree C. Or 1 kcal = 1 Calorie = 1000 calories so a Calorie (not capital C Calorie not calorie) is the amount of heat required to raise the temperature of 1 kg of water 1 degree C. A food Calorie and an exercise Calorie are both capital C's.
The purpose of the lab was to do work by twirling a pvc pipe, with lead shot in it, 100 times and measuring the temperature of the lead shot before and after the 100 twirls. All our work (W = Fs) turned into an equal amount potential energy ( P. E. = mgh) which turned into kinetic energy as it fell until it was all kinetic energy (K.E.= 1/2 m v^2) and finally this lab was to prove that all the energy lastly turned into HEAT energy ( Q = cmT).
So we figured out the Work in Joules using ( W = F s = Weight X s = mgh) and then the Quantity of Heat in calories (Q = cmT) finally taking the ration of the Joules over the calories to obtain what is called the Mechanical Equivalent of Heat because it is the conversion for how many joules in a calorie.
A calorie is defined to be the amount of heat required to raise the temperature of 1 gram of water 1 degree C. Or 1 kcal = 1 Calorie = 1000 calories so a Calorie (not capital C Calorie not calorie) is the amount of heat required to raise the temperature of 1 kg of water 1 degree C. A food Calorie and an exercise Calorie are both capital C's.
Period 1 Period 4 Period 5 Period 7 Period 8
Videos taken of the lab. The first one is pouring in the lead and the second video taking the temperature and starting the twirls and the rest are doing the twirls.
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