1. A car passes at 200 km/hr blowing a horn which has afrequency of 2000 Hz. By

Question

1. A car passes at 200 km/hr blowing a horn which has afrequency of 2000 Hz. By how much does the frequency changewhen the car passes? A) 326 Hz    B) 280Hz    C) 652 Hz    D) 389Hz

2. A steel meter stick with coefficient of linear expansion11x10-6/°C is used to measure a material withcoefficient 5.5x10-6/°C. What is the % changein what the meter rod measures as the temperature rises from20°C to 40°C? A)1%        B).01%    C) 50%      D).033%
3. When a pipe decreases to one half its radius and the pressuredecreases by a tenth of an atmosphere, what is the speed of thewater in the larger pipe? A) 1.15m/s    B)1.33m/s    C) 2.66m/s    D)4 m/s 1. A car passes at 200 km/hr blowing a horn which has afrequency of 2000 Hz. By how much does the frequency changewhen the car passes? A) 326 Hz    B) 280Hz    C) 652 Hz    D) 389Hz

2. A steel meter stick with coefficient of linear expansion11x10-6/°C is used to measure a material withcoefficient 5.5x10-6/°C. What is the % changein what the meter rod measures as the temperature rises from20°C to 40°C? A)1%        B).01%    C) 50%      D).033%
3. When a pipe decreases to one half its radius and the pressuredecreases by a tenth of an atmosphere, what is the speed of thewater in the larger pipe? A) 1.15m/s    B)1.33m/s    C) 2.66m/s    D)4 m/s

Explanation / Answer

speed of sound =330 m/s = 1188 km /hr speed of car = 200 km/hr = 55.55 m/s 2000[(330/(330-55.55) - (330)/(330+55.55)] = 652 Hz C
change = l(1-2)(40-20)/l*100 = 2000 = 2000(11-5.5)*10-6 = 0.011% B

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