When an object is moving with uniform circular motion, the object's tangential speed
a. is circular
b. is perpendicular to the plane of motion
c. is constant
d. is directed toward the center of motion
and why is it correct?

c. is constant

Explanation:

The rotational motion with the uniform angular velocity has a constant tangential speed.But its velocity component is variable and changes its direction at every point.The direction of the velocity is along the tangential line in the plane of motion and perpendicular to the radius of circular.But the magnitude of the velocity called speed is constant throughout the motion if it has a constant angular velocity. The linear velocity is related to the angular velocity by the formula                                            

                                              v = rω

none of the light would pass through.

Option D.

Explanation:

Polarized sun glasses are particular eyewear intended to diminish glare from surfaces, for example, water, day off, glass. Glare contorts the genuine nature of articles and makes them harder to recognize.

Polarized lenses can make glare progressively agreeable." But the medical advantages will in general stop there. ... Polarization functions admirably at shutting out the glare from the snow when you're skiing, however you can likewise lose a portion of the shapes of the snow because of various reflections falling off various surfaces."