A fuel pump sends gasoline from a car's fuel tank to the engine at a rate of 5.37x10-2 kg/s. The density of the gasoline is 739 kg/m3, and the radius of the fuel line is 3.37x10-3 m. What is the speed at which gasoline moves through the fuel line

Speed v = 2.04 m/s

the speed at which gasoline moves through the fuel line is 2.04 m/s

Explanation:

Given;

Mass transfer rate m = 5.37x10^-2 kg/s.

Density d = 739 kg/m3

radius of pipe r = 3.37x10^-3 m

We know that;

Density = mass/volume

Volume = mass/density

Volumetric flow rate V = mass transfer rate/density

V = m/d

V = 5.37x10^-2 kg/s : 739 kg/m3

V = 0.00007266576454 m^3/s

V = 7.267 * 10^-5 m^3/s

V = cross sectional area * speed

V = Av

Area A = πr^2

V = πr^2 * v

v = V/πr^2

Substituting the given values;

v = 7.267 * 10^-5 m^3/s / (π * (3.37x10^-3 m) ^2))

v = 0.203678639672 * 10 m/s

v = 2.04 m/s

the speed at which gasoline moves through the fuel line is 2.04 m/s