Determine the components of reaction at the fixed support

a. the 400 n, 500 n, and 600 n forces are parallel to the x, y, and z axes, respectively

c

explanation:

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.