Physics lab examination question?
use your insulated crater (and a little incomparable microwaveable container, if available) as well as your thermometer to establish a in effect in progress appetite of a x-ray oven for opposite amounts of water. Try to make make use of of 4 or 5 opposite amoutns of H2O widespread over as far-reaching a operation of volumes as probable ( couple of tens of cc’s to 5000 or more) pattern an expierment regulating whayt we know about thermal properties of H2O to pattern an examination to exam how many appetite is eliminated to a H2O in a since volume of time. from this dimensions we can establish a tangible appetite in watts which a x-ray delivers to a water. how does a limit in progress appetite we magnitude review to a electrical appetite a x-ray uses? formed upon your date, what amounts of H2O corresponded to a many fit make make use of of of electrical power?
please assistance appreciate we really much.
The transfer of thermal energy to the water that under goes a temperature change, Tf – Ti , is found from the heat formula;
Q = MC(Tf – Ti)
So measure the temp. (in Celsius) before and after you microwave it and sub into the formula.
The power is the rate of energy transfer, so divide , Q , by the time you microwaved. Compare your experimental value of power, Q/t , with the wattage on the microwave. Probably in the back or underneath the machine.
C = specific heat of water. Look it up. Use units of, Joules/kg-degC.
M = mass of the water in kg. You can find that from density x volume. Be sure to change volume in cc to cubic meters and use density in kg/m^3.