Q7. A 2m X 2m X 2m enclosure is constructed around a small compressor. The enclosure is made of a lightweight metal with a transmission loss of 26 dB at 500 Hz. The average absorption coefficient in the enclosure is 0.3 in the 500 Hz octave frequency band. The compressor generates a sound power level of 105 dB in the 500 Hz octave band. Calculate the A-weighted sound power level radiated by the exterior of the enclosure. Assume the interior of the enclosure is diffuse. (Answer : 84.7 dB(A))

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9 A car making a 100 km journey covers the first 50 km. at 40 km/h. How fast must it cover the second 50 km. to have an average speed of 50 km/h for the entire trip? Show your solution 66.7 km/h 10 km/h 100 km/h 40 km/h

What are 3 ways an object can have acceleration? Choose the best 3 answer please. 1. Have a high speed  2. Decrease speed  3. Change direction  4. increase speed  5. Remain at rest 6. Have constant velocity

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A skier starts at the top of a 12º frictionless slope with a speed of 2.5 m/s. Her speed at the bottom is 15 m/s.   Part A What is her acceleration on the slope?        Part B What is the length of the slope?       Part C How long does it take her to reach the bottom?

A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is 00 5 m/s². 9.8 m/s². O 10 m/s². O 20 m/s².