A3.5 kg block is pushed along a horizontal floor by a force f? of magnitude 15 n at an angle ? =40° with the horizontal (fig. 6.8). the coefficient of kinetic friction between the block and the floor is 0.25 . calculate the magnitudes of (a) the frictional force on the block from the floor and (b) the block's acceleration.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

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

no image, but probably absorption

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.