Angular frequency ω = sqrt(k/m) = sqrt(8/2) = sqrt(4) = 2 rad/s.

Polarized sunglasses have polarizing filters that block the component of reflected (glare) light, thereby reducing glare.

A small damping force (low damping) leads to a high quality factor and a sharp resonance peak.

When equal-amplitude SHMs of same frequency are in quadrature (phase differences producing circular motion) their resultant is a circle.

In standing (stationary) waves each particle oscillates with a fixed amplitude pattern (nodes and antinodes), so amplitude distribution is fixed.

ω = 1570.8 = 2πf so f = ω/(2π) = 250 Hz, hence T = 1/f = 0.004 s.

In a horizontally accelerating frame the effective gravity is the vector sum of g and a, so g' = √(g^2 + a^2), which determines the period.

Resonance occurs when the driving frequency matches (is similar to) the natural frequency of the undamped system.

Tuning a radio involves selecting the electrical circuit resonance at a particular frequency, so it is electrical resonance.

Superposition affects amplitude but does not change the propagation speed of the constituent travelling waves.