(Record your values to two significant figures.) (b.) About which point is the w
ID: 1291561 • Letter: #
Question
(Record your values to two significant figures.)
(b.) About which point is the water molecule in food most likely to rotate? Explain how you determined your answer.
(c.) Microwave ovens transfer about 700 W att of heating power to the food placed in them. Microwave ovens make the water molecules rotate with an incredibly high frequency. They effectively rotate at 0.85 GHz. If 500 g of water (in a microwave- safe bowl) is placed in a microwave, estimate how long the microwave would need to run in order to rotate every single water molecule. Comment on whether it seems possible for a microwave oven to rotate every molecule of water in food.
that the mass of each atom is concentrated at the center of the circles shown so that you can use the equation I = (sigma)miri2. To help compare the relative sizes of each moment, also find the ratio of each moment the moment for rotation about point A. (Record your values to two significant figures.) (b.) About which point is the water molecule in food most likely to rotate? Explain how you determined your answer. (c.) Microwave ovens transfer about 700 W att of heating power to the food placed in them. Microwave ovens make the water molecules rotate with an incredibly high frequency. They effectively rotate at 0.85 GHz. If 500 g of water (in a microwave- safe bowl) is placed in a microwave, estimate how long the microwave would need to run in order to rotate every single water molecule. Comment on whether it seems possible for a microwave oven to rotate every molecule of water in food.Explanation / Answer
1) about A
IA=2*H*r2
2*3.3*10-27 *(9.6*10-11)=608.256*10-49=6.08*10-47
2)about B
AX=rcos(52.25o) =0.6122r AC=0.4082 x mid point of two H atom.
BX=rsin(52.25o) =0.79r 2*BX=1.58r
Distance from other H to B=1.58r
IB=H*(1.58r)2+O*r2
3.3*10-27*(1.58*9.6*10-11)2+2.7*10-26*(9.6*10-11)2=32.4723*10-47
BC2=Cx2 +BX2
gives BC=0.816r
IC=O*(0.4082r)2+2*H*(0.816r)2 =8.19217*10-27
Divided by IA gives
IA/IA=1
IB/IA=5.34
IC/IA=1.347
part2
It wll rotate about the point having minimum I
Hence A
w=2pif
KE=1/2Iw2
mass of one molecule=33.6*10-26kg
for 0.5kg water
=number of molecules*KE of one molecule
=(0.5/(33.6*10-26))*1/2*(6.08*10-47)(2pi0.85*109)2=0.1288Joules
time taken by microwave
=).1288/700=1.845*10-4s
No it is not possible to rotate each and every molecule because each molecule is linked to the other via
E field .Hence in presence of these E field it is not possible to rotate fully.
Infact only pure water molecules can be rotated which is also theoretical
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