Consider a flat plate positioned inside a wide tunnel, and air at 1 atm and 20oC is flowing with free stream velocity of 60 m/s. What is the minimum length of the plate necessary for the Reynolds number to reach 2 x 107?

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.