Physics, 24.07.2019 08:30 amandapill
Biological farming is any method of farming that utilizes natural, biological processes and methods for managing crops and livestock. the goal of biological farming is to produce high-quality, healthful food and farm products by ecologically sound methods that protect water, soil, air, wildlife and other environmental resources, both on and off the farm. what is one positive ecological impact of switching to biological farming? a) it reduces herbicide and pesticide use. b) it reduces microbial activity in the soil. c) it reduces the dependence on organic fertilizers. d) it reduces the populations of earthworms in the soil.
Answers: 2
Physics, 21.06.2019 23:00
Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm
Answers: 2
Physics, 21.06.2019 23:00
Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300ยฐ c, and the exhaust water is at 37ยฐ c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?
Answers: 1
Physics, 22.06.2019 11:50
The mass of the sun is 1.99ร1030kg and its distance to the earth is 1.50ร1011m. what is the gravitational force of the sun on the earth?
Answers: 3
Biological farming is any method of farming that utilizes natural, biological processes and methods...
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