Why do objects appear darker when wet

It is a matter of how your eyes percive light and how some wet objects refract light differently then their dry counter parts In reality wet objects are not really darker then dry objects that just how the human eye sees it.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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