You've already learned that a single tone is usually made up of multiple different resonant frequencies, which are pure tones. This article addresses how any complex tone can be represented by a spectrum of all its resonant frequencies. Using this information, explain how it is possible for a large number of flutes (which produce almost pure tones) to imitate the sound of another instrument (such as a violin) by using its harmonic spectrum for a given note. Will the flutes, together, be able to reproduce the instrument's tone identically

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Coal contains energy. a. light b. kinetic c. chemical d. mechanical

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping. the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?