Angle of incidence and reflection are measured with respect to the normal (perpendicular) at point of incidence. Not from surface. If angle from surface given, convert.
Raindrops fall to the ground with a uniform, constant velocity. This constant velocity is achieved when the gravitational pull is perfectly balanced by:
Explanation:
As a raindrop falls, it accelerates due to gravity. The upward viscous drag force of the air increases with the drop's velocity (Stokes' Law). Eventually, the downward weight of the drop is exactly balanced by the upward buoyant force of the air plus the upward viscous drag force. The net force becomes zero, and it falls with a constant 'terminal velocity'.
Explanation:
Higher frequency → higher pitch. Amplitude increases loudness. Wavelength inversely proportional to frequency (v constant). So increasing frequency increases pitch.
Explanation:
Convection: movement of fluid due to density differences caused by temperature. Hot fluid rises, cold sinks, creating currents. Land/sea breeze, trade winds. Conduction in solids primarily.
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