Matched Problem 4 The productivity of an airplane–manufacturing company is given approximately by the Cobb–Douglas production function f ( x , y ) = 40 x 0.3 y 0.7 (A) Find f x ( x, y ) and f y ( x, y ). (B) If the company is currently using 1.500 units of labor and 4,500 units of capital, find the marginal productivity of labor and the marginal productivity of capital. (C) For the greatest increase in productivity, should the management of the company encourage increased use of labor or increased use of capital?
Matched Problem 4 The productivity of an airplane–manufacturing company is given approximately by the Cobb–Douglas production function f ( x , y ) = 40 x 0.3 y 0.7 (A) Find f x ( x, y ) and f y ( x, y ). (B) If the company is currently using 1.500 units of labor and 4,500 units of capital, find the marginal productivity of labor and the marginal productivity of capital. (C) For the greatest increase in productivity, should the management of the company encourage increased use of labor or increased use of capital?
Solution Summary: The author calculates the partial derivative of the function f(x,y)=12x-0.7y
Matched Problem 4The productivity of an airplane–manufacturing company is given approximately by the Cobb–Douglas production function
f
(
x
,
y
)
=
40
x
0.3
y
0.7
(A) Find fx(x, y) and fy(x, y).
(B) If the company is currently using 1.500 units of labor and 4,500 units of capital, find the marginal productivity of labor and the marginal productivity of capital.
(C) For the greatest increase in productivity, should the management of the company encourage increased use of labor or increased use of capital?
2. Answer the following questions.
(A) [50%] Given the vector field F(x, y, z) = (x²y, e", yz²), verify the differential identity
Vx (VF) V(V •F) - V²F
(B) [50%] Remark. You are confined to use the differential identities.
Let u and v be scalar fields, and F be a vector field given by
F = (Vu) x (Vv)
(i) Show that F is solenoidal (or incompressible).
(ii) Show that
G =
(uvv – vVu)
is a vector potential for F.
A driver is traveling along a straight road when a buffalo runs into the street. This driver has a reaction time of 0.75 seconds. When the driver sees the buffalo he is traveling at 44 ft/s, his car can decelerate at 2 ft/s^2 when the brakes are applied. What is the stopping distance between when the driver first saw the buffalo, to when the car stops.
Topic 2
Evaluate S
x
dx, using u-substitution. Then find the integral using
1-x2
trigonometric substitution. Discuss the results!
Topic 3
Explain what an elementary anti-derivative is. Then consider the following
ex
integrals: fed dx
x
1
Sdx
In x
Joseph Liouville proved that the first integral does not have an elementary anti-
derivative Use this fact to prove that the second integral does not have an
elementary anti-derivative. (hint: use an appropriate u-substitution!)
Chapter 7 Solutions
Calculus for Business Economics Life Sciences and Social Sciences Plus NEW
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