The area of a telescope lens is 6.679 × 103 mm2. (a) what is the area in square feet (ft2)? enter your answer in scientific notation. (b) if it takes a technician 43.4 s to polish 1.46 × 102 mm2, how long does it take her to polish the entire lens?

Given:

Area of a telescope lens = 6.679 *

a)

Area of lens = 6.679 * * 1.076*10^{-5} ft^{2}[/tex]

                     = 7.187 *

b) Time taken to polish an area of 1.46 * = 43.4 s

Therefore, time taken to polish the entire lens

                   = 43.4 * 6.679 *

                   = 1985 sec  

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.