The engine in a small airplane is specified to have a torque of 500 N⋅m. This engine drives a 1.9-m-long, 40 kg single-blade propeller.

On startup, how long does it take the propeller to reach 2000 rpm?
Express your answer with the appropriate units.

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature