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jrd007
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Fluid Problems
1) The gauge pressure in each of the four tires of a car is 240kPa. If each tire has a "footprint" of 220cm^2, estimate the mass of the car. answer: 2.2 x 10^3 kg pressure = 240 kPa, Area = 2.2 x 10^3 kg
The first thing I assume i need to do is convert kPa but I have not found that in my book... I know that pressure = Force/surface area = mg/A. I could use that formula to solve for mass?
240kPa = (m x 9.8 m/s^2)/2.2 m^2
2) A balloon has a radius of 7.35 m and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon has a mass of 930 kg. (Neglect the buoyant force on the cargo volume itself).920 kg
r = 7.35 m, m = 930 kg, cargo mass = ? Again I have no idea how to attempt this. This chapter has been extremely hard for me.
3) What is the likely idenity of a metal if a sample has a mass of 63.5g when measured in air and an apparent mass of 55.4 g when submerged in water? (It also gives us a table and let's us know the densities of several metals but the important one is steel/iron which is 7.8 x 10^2 kg/m^3)
How do we use the two masses given to find out that it has that density. I have no ideas about this one.
The answer is iron/steel
1) The gauge pressure in each of the four tires of a car is 240kPa. If each tire has a "footprint" of 220cm^2, estimate the mass of the car. answer: 2.2 x 10^3 kg pressure = 240 kPa, Area = 2.2 x 10^3 kg
The first thing I assume i need to do is convert kPa but I have not found that in my book... I know that pressure = Force/surface area = mg/A. I could use that formula to solve for mass?
240kPa = (m x 9.8 m/s^2)/2.2 m^2
2) A balloon has a radius of 7.35 m and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon has a mass of 930 kg. (Neglect the buoyant force on the cargo volume itself).920 kg
r = 7.35 m, m = 930 kg, cargo mass = ? Again I have no idea how to attempt this. This chapter has been extremely hard for me.
3) What is the likely idenity of a metal if a sample has a mass of 63.5g when measured in air and an apparent mass of 55.4 g when submerged in water? (It also gives us a table and let's us know the densities of several metals but the important one is steel/iron which is 7.8 x 10^2 kg/m^3)
How do we use the two masses given to find out that it has that density. I have no ideas about this one.
The answer is iron/steel
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