Which is greater 45 RPM or 4.71 rad/s? Why?

45 rpm is greater/faster. Convert both measurements to the same unit rate:

45 rpm = (45 rev) / (1 min) = (45 rev) / (60 s) = 0.75 rps

4.71 rad/s = (4.71 rad) / (1 s) • (1 rev) / (2π rad) = (4.71 rev) / (2π s) ≈ 0.74962 rps

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate