Question

Hey can anyone please help me with this it’s due in few hours and I’m stuck

Answer 1

Answer:

1)  P = rho g h = d g h    where d is replacing the greek letter rho (density)

a)   pressure at A must be 1/2 that of B because of 1/2 the height

b) pressure at B equals that at D because the height is the same

 (Pascal's principle - pressure in a fluid is same in all directions)

c) pressure A is the same as that C

d) the pressure at B would be .8  of the water at B if paraffin replaced the water  (P = d g h = .8 * dw g h)      due to change in density

2)   Volume = 4 m X 3 m X 2 m) = 24 m^3    volume of tank

b) mass = volume * density  = 24 m^3 * 800 kg / m^3 = 19,200 kg

c) weight = mass * gravity = 19,200 kg * 9.8 m/s^2 = 188,160 Newton's

d) P = d g h = 800 kg/m^3 * 9.8 m/s^2 * 2 m 15,680 N/m^2

Pressure is given in force/area or N/m^2

3) Pw / Pp = dw / dp = 1000 / 800 = 1.25

Pw = 1.25 Pp = 15,680 m/s^2 * 1.25 = 19,600 Pascal's