Physics help please?? Thanks Much!!
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Physics help please?? Thanks Much!!

[From: ] [author: ] [Date: 11-05-20] [Hit: ]
and Fluids. Please explain in detail!!1) A stretched string is 160 cm long and has a linear density of 0.015 g/cm. What tension in the string will result in a second harmonic (Standing wave) of 460 Hz?......
I need help with these physics problems please?? They include standing waves, Doppler effect and Decibels, Archimedes' Principle, Pascal's Law- Pressure and depth, and Fluids. Please explain in detail!!

1) A stretched string is 160 cm long and has a linear density of 0.015 g/cm. What tension in the string will result in a second harmonic (Standing wave) of 460 Hz??

2) A steel wire in a piano has a length of 0.70 m and a mass of 4.3 x 10^-3 kg. To what tension must this wire be stretched in order that the fundamental vibration correspond to middle C, Fc=261.6 Hz on the chromatic musical scale??

3) A fire engine has a siren whose frequency is 500 Hz. What frequency is heard by a stationary observer when the engine moves toward her at 11 m/s?? How about when it moves away??

4) A vacuum cleaner has a measured sound intensity level of 70 dB. What is the intensity of this sound in W/m^2??

5) Please calculate the buoyant force on a solid object made of copper and having a volume of 0.2 m^3 if it is completely submerged in water. What is the result if the object is made of steel?? (density of copper is 8.92 x 10^3 kg/m^3, and the density of steel is 7.86 x 10^3 kg/m^3)

6) Sorry about this one, my teacher is CRAZY!!
You bring your 14,500 N coconut car to the mechanic to have its coconut milk changed. The mechanic raises your coconut car with a hydrolic lift. If the radius of the small piston is 4cm and the radius of the large piston is 17 cm, what force must be exerted on the small piston to lift the car??

7) When a person't blood pressure is taken, it is measured on the arm at approximately the same level as the heart. (a) How would the results differ if the measurements were to be made on the patient's leg?? (b) What is considered normal for a blood pressure reading?? (c) What units is blood pressure measured in?? (d) What is the difference between systolic and diastolic??

Thank you!! Please help me!! I'm desperate!!
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