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2B1115 Ingenjörsmetodik för IT och ME, HT 2004<br />
Omtentamen<br />
Måndagen den 23:e aug, 2005, kl. 9:00-14:00<br />
Lösningsförslag<br />
Uppgift 1<br />
ln x<br />
2 = 2ln<br />
a) ( ) x<br />
d d<br />
ln( x ) 2 ln x<br />
2 2<br />
2 d 2 d ⎛ 1 ⎞ 2<br />
= = & ln( x ) = 2 = −<br />
2<br />
⎜ ⎟ 2<br />
dx<br />
dx<br />
x<br />
dx<br />
dx ⎝ x ⎠<br />
x<br />
b) 3 x = 3 x<br />
1<br />
d d 3 − 3<br />
x x x<br />
1<br />
2<br />
2<br />
3 = 3 = =<br />
dx dx 2 2 x<br />
2<br />
d<br />
dx<br />
2<br />
3x<br />
=<br />
3<br />
2<br />
d<br />
dx<br />
x<br />
1<br />
−<br />
2<br />
= −<br />
1<br />
3<br />
4<br />
x<br />
3<br />
−<br />
2<br />
= −<br />
&<br />
3<br />
4<br />
1<br />
x<br />
3<br />
c)<br />
∂<br />
sin<br />
∂x<br />
1<br />
= 2sin<br />
∂<br />
∂x<br />
2<br />
sin<br />
= 2sin<br />
2<br />
( x + x ) = 2sin( x + x ) sin( x + x ) = 2sin( x + x ) cos( x + x ) ( x + x )<br />
( x + x ) cos( x + x )<br />
2<br />
1<br />
1<br />
2<br />
2<br />
1<br />
1<br />
2<br />
2<br />
∂<br />
∂x<br />
1<br />
1<br />
( x + x ) = 2sin( x + x ) sin( x + x ) = 2sin( x + x ) cos( x + x ) ( x + x )<br />
( x + x ) cos( x + x )<br />
1<br />
1<br />
2<br />
2<br />
1<br />
2<br />
1<br />
2<br />
∂<br />
∂x<br />
2<br />
1<br />
2<br />
2<br />
1<br />
1<br />
2<br />
2<br />
1<br />
1<br />
2<br />
2<br />
∂<br />
∂x<br />
2<br />
∂<br />
∂x<br />
1<br />
1<br />
1<br />
2<br />
=<br />
2<br />
=<br />
a<br />
x1 x2<br />
= x1<br />
x2<br />
a a<br />
d) ( )<br />
∂<br />
∂x<br />
1<br />
d<br />
dx<br />
2 a a a a 1 a−1<br />
a<br />
( x x ) = x x = x ax<br />
− = ax x<br />
1<br />
2<br />
2<br />
1<br />
1<br />
2<br />
1<br />
1<br />
2<br />
∂<br />
∂x<br />
2 a a a a 1 a a−1<br />
& ( )<br />
2<br />
x x<br />
1<br />
2<br />
= x<br />
1<br />
d<br />
dx<br />
2<br />
x = x ax<br />
2<br />
1<br />
− 2<br />
=<br />
ax<br />
1<br />
x<br />
2<br />
Uppgift 2<br />
Svar: Ekvationen är enhetsenlig.<br />
Storhet m, dm u, dv dt F<br />
SI-enhet kg m/s s N=kgm/s 2<br />
dv<br />
Vänster led m : (kg)×[(m/s)/s]=kgm/s 2<br />
dt<br />
Höger led termen F : kgm/s 2<br />
dm<br />
Höger led termen u : (m/s)×(kg/s)=kgm/s 2<br />
dt