How many elements are essential for plant growth?

a. 3 c. 16
b. 10 d. 27


C

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If no specifications are available, the approximate pressures in most transmissions will be ________.

A) Neutral, park, and drive at idle: 100 to 120 PSI (690 -827 kPa) B) Neutral, park, and drive at idle: 50 to 60 PSI (350 to 400 kPa) C) Neutral, park, and drive at idle: 160 to 200 PSI (1100-1380 kPa) D) Neutral, park, and drive at idle: 120 to 160 PSI ( 827-1100kPa)

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PROBLEM 3.57 At a time when rotation is prevented at the lower end of each shaft, a 50-N · m torque is applied to end A of shaft AB. Knowing that G = 77.2 GPa for both shafts, determine (a) the maximum shearing stress in shaft CD, (b) the angle of rotation at A.

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Which of the following is not considered one of the five major factors influencing soil formation?

A) living organisms B) valence state C) climate D) topography E) native parent materials

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Consider the duct system shown in the accompanying figure. Air flows through two 8- in.-by-10-in. ducts that merge into a 18-inch-by-14-inch duct. The average speed of the air in each of the 8 x 10 duct is 30 ft/s. What is the volume flow rate of air in the 18 × 14 duct? Express the volume flow rate in ft^3/s, ft^3/min, and m3/s. What is the average speed of air in the 18 ×14 duct?

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