Glycerine in water diffuses along a horizontal column that has a cross-sectional area of 2.0 cm2. The concentration gradient is 0.03 kg/m4, and the diffusion rate is found to be 5.7e^-15kg/s. Determine the diffusion coefficient. m2/sc
a. 1.9e-13 m2/s
b. 1.7e-16 m2/s
c. 9.5e-10 m/s
d. 3.4e-20 m2/s
e. 3.8e-17 m2/s

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this