course Phys 202
1.63.546 u =atomic mass3.4 grams / 63 grams Cu per mole = 0.05397moles
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0.05397moles*6.02*10^23mol^-1= 3.25 *10^22 molecules
2. 6.5g Au/ 196.96655 g Au per mole=. 13454 moles Au
. 13454 moles Au* 6.022 10^23 mol^-1=8.09910^22molecules
25.6g Ag/108.86655g per mole Ag= .24567 moles Ag
.24567 moles Ag*6.022 10^23 mol^-1=1.479*10^23 molecules
The silver ring has more molecules then the gold one.
3. (a) T (?)=5/9* [T(?)-32]
T (?)=5/9 *(68?-32)=.20?
(b) T (?)=9/5* T(?) +32
9/5* (1800?+32)= 3272?
4. 136?; 5/9* [T(?)-32] =5/9 *(136?-32)=5/9* (104)=57.78?
-129?; 5/9* [T(?)-32] =5/9 *(-129?-32)= 5/9*(-161)=-89.44?
5. (a) T (?)=9/5* -15 +32=-27+32=5?
(b) T (?)=5/9* (-15?-32)= 5/9* (-47)-26.11?
6. L1=11.82cm T1=0.0? L2=22.85cm T2=100?
dL/dT=11.03cm/100?=.1103cm/1?
a)16.70cm dL=16.70cm-11.82cm=4.88
dL/dT=.1103cm/1?=4.88cm/x
4.88cm=.1103cm*x
4.88cm/.1103cm=x=44.24?
b) 20.50cm DL=20.50cm-11.82cm= 8.68cm
dL/dT =.1103cm/1?=8.68cm/x
8.68cm=.1103cm*x=
8.68cm/.1103cm=x=78.69?
8. L=2.0m dT=5.0? α=0.2*10^-6(C? ?
dL=αL0dT
=0.2*10^-6(C? ^?*2.0m*5?=0.000002m or 2*10^-6
The coefficient of expansion of steel=12*10^-6 (C? ^?
12*10-6 (C?^?*2.0m= 24*10^-6. It is 12 times more then the alloy.
12. volume= 4/3*pi*r3
=(4/3)*pi*(8.75/2)^3=(4/3)*pi*(4.375)^3
=(4/3)*pi*(83.74)=350.769cm^3
dV= βVodT
1.0*10^-6*352.769cm^3*(200?-30?)=0.0596cm or 0.06cm
17.p= mass/volume
dV= βVodT
dp=-βpdT
b) dT=-40?-25?=-65?
dT=11.3*10^3
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