Vol2 Derivadas, aplicaciones y temas especiales - CIMM
Vol2 Derivadas, aplicaciones y temas especiales - CIMM
Vol2 Derivadas, aplicaciones y temas especiales - CIMM
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99 Elementos de cálculo, volumen 2<br />
28. Un material radiactivo se desintegra siguiendo<br />
el modelo exponencial. Si en el instante t = 0<br />
minutos hay 20 gramos del material y a los 30<br />
minutos hay 16 gramos, ¿escriba una fórmula<br />
que le permita saber cuántos gramos del mate-<br />
rial hay en cada momento?, ¿en cuánto tiempo<br />
quedarán 8 gramos? (use calculadora)<br />
29. Se llama vida media o semivida de un material<br />
radiactivo al tiempo que tarda en reducirse a<br />
la mitad de la cantidad inicial. Suponga que<br />
se tienen 400 gramos de un material cuya vida<br />
media es de 8 horas. ¿Cuánto tardará en re-<br />
ducirse a 100 gramos?, ¿cuántos gramos habrá<br />
a las 4 horas? (use calculadora).<br />
30. Una zapatería produce zapatos de hombre y<br />
de mujer. Producir cada zapato de hombre<br />
le cuesta |c 600 y producir cada zapato de mu-<br />
jer le cuesta |c 650; además tiene costos fijos<br />
(agua, luz, teléfono, alquiler, etc.) semanales<br />
por un monto de |c 200 000. Si en una semana<br />
produce un número x de zapatos de hombre y<br />
un número y de zapatos de mujer, escriba la<br />
función de costo C como una función de las<br />
variables x e y.<br />
31. Utilice la información que se proporciona en<br />
la figura 9.21 para dar una aproximación del<br />
área sombreada.<br />
1 5<br />
4<br />
3<br />
2<br />
2<br />
7<br />
2<br />
4<br />
✲<br />
✻<br />
x<br />
y<br />
..... .<br />
.<br />
..........<br />
....... ... ..... .......<br />
...... .<br />
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9<br />
8, 5<br />
5<br />
3, 2<br />
2, 2<br />
Figura 9.21.<br />
32. Escriba una función de tres variables que per-<br />
mita calcular el área sombreada en la figura<br />
9.22.<br />
x y<br />
r<br />
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. . . . . . . ...<br />
Figura 9.22.<br />
33. Escriba una función de tres variables que per-<br />
mita calcular el volumen del sólido dado en la<br />
figura 9.23.<br />
✲<br />
❂<br />
✻<br />
y<br />
x<br />
z<br />
z<br />
x<br />
y<br />
Figura 9.23.<br />
34. Para la función f(x) = sen(xy) calcule<br />
(a) ∂ f<br />
∂ x<br />
(b) ∂ f<br />
∂ y<br />
(c) ∂ 2 f<br />
∂ x 2<br />
(d) ∂ 2 f<br />
∂ y 2<br />
(e) ∂ 2 f<br />
∂ y∂x<br />
35. Para la función f(x) = 2zxy + x 2 y 2 z 2 calcule<br />
(a) ∂ f<br />
∂ x<br />
(b) ∂ f<br />
∂ y<br />
(c) ∂ f<br />
∂ z<br />
(d) ∂ 2 f<br />
∂ x 2<br />
(e) ∂ 2 f<br />
∂ y 2<br />
(f) ∂ 2 f<br />
∂ z 2<br />
(g) ∂ 2 f<br />
∂ y∂x<br />
(h) ∂ 2 f<br />
∂ y∂z<br />
(i) ∂ 2 f<br />
∂ z∂x