Two blades of grass are growing straight upward. They are parallel, with their b
ID: 2256522 • Letter: T
Question
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
Explanation / Answer
28.31 dyn cm