1. Two blades of grass are growing straight upward. They are parallel, with thei
ID: 2256159 • Letter: 1
Question
1. Two blades of grass are growing straight upward. They are parallel, with their broadest surfaces facing each other. These surfaces look like long rectangles. The width of the rectangles is 1 cm. The rectangular blades of grass are 6 cm tall. The rectangular surfaces of the grass blades are separated by 0.3 cm. Water has been pulled upward between the blades by capillary forces, forming what is essentially a rectangular tube of water (volume = length X width X height for this tube of water). The contact angle between the water and the grass surface is 20
Two blades of grass are growing straight upward. They are parallel, with their broadest surfaces facing each other. These surfaces look like long rectangles. The width of the rectangles is 1 cm. The rectangular blades of grass are 6 cm tall. The rectangular surfaces of the grass blades are separated by 0.3 cm. Water has been pulled upward between the blades by capillary forces, forming what is essentially a rectangular tube of water (volume = length X width X height for this tube of water). The contact angle between the water and the grass surface is 20degree. What torque does the surface tension of the water generate on the base of each blade of grass?Explanation / Answer
b. 5.42 dyn cm
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