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Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m cubed and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m cubed. What is the speed of the air when it leaves the nozzle? a.... 顯示更多 Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m cubed and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m cubed. What is the speed of the air when it leaves the nozzle? a. 176 m/s b. 29.3 m/s c. 35.2 m/s d. 343 m/s The decibel is a unit of: a. Wavelength. b. Frequency. c. Amplitude. d. Loudness.
最佳解答:
6 (rho1)A1v1=(rho2)A2v2 rho :density [15.0/2]^2*pi*1.2=[2.5/2]^2*pi*v v=176 m/s 答案是A 14 The decibel is a unit of: 答案是D The decibel (dB) is used to measure sound level 2007-01-05 19:03:46 補充： 5.25[15.0/2]^2*pi*1.2=1.29[2.5/2]^2*pi*v
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Physics Exam6,14發問:
Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m cubed and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m cubed. What is the speed of the air when it leaves the nozzle? a.... 顯示更多 Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m cubed and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m cubed. What is the speed of the air when it leaves the nozzle? a. 176 m/s b. 29.3 m/s c. 35.2 m/s d. 343 m/s The decibel is a unit of: a. Wavelength. b. Frequency. c. Amplitude. d. Loudness.
最佳解答:
6 (rho1)A1v1=(rho2)A2v2 rho :density [15.0/2]^2*pi*1.2=[2.5/2]^2*pi*v v=176 m/s 答案是A 14 The decibel is a unit of: 答案是D The decibel (dB) is used to measure sound level 2007-01-05 19:03:46 補充： 5.25[15.0/2]^2*pi*1.2=1.29[2.5/2]^2*pi*v
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