subject
Engineering, 21.09.2020 14:01 cdradlet2001

Suppose we express the amount of land under cultivation as the product of four factors: Land= (Land / food ) x (Food/ K Cal) x (Kcal/person) x(population)
The annual growth rates for each factor are 1 the land required to grow a unit of food 1 percent due to greater productivity per unit of land 2 the amount of food grown per calorie of food eaten by a human 0.5 percent because with affluence people consume more animal products which greatly reduces the efficiency of land use 3 the per capita calorie consumption 0.1 percent and 4 the size of the population 1.5 percent At these rates how long would it take to double the amount of cultivated land needed? At that time how much less land would be required to grow a unit of food?

ansver
Answers: 1

Other questions on the subject: Engineering

image
Engineering, 04.07.2019 18:10, sarahgrindstaff123
Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.
Answers: 2
image
Engineering, 04.07.2019 18:10, lowkeyqueenk
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
image
Engineering, 04.07.2019 18:20, jessie8022
Apiston-cylinder device contains 0.1 m3 of liquid water and 0.9 m3 of water vapor in equilibrium at 800 kpa. heat is transferred at constant pressure until the temperature of water reaches 350 °c. determine (a) the quality of water at the initial state (b) the work associated with this process, (c) the heat associated with this process.
Answers: 2
image
Engineering, 04.07.2019 19:10, nayi2002
The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object
Answers: 1
You know the right answer?
Suppose we express the amount of land under cultivation as the product of four factors: Land= (Land...

Questions in other subjects:

Konu
Mathematics, 09.06.2020 05:57