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Total questions: 18
Worksheet time: 22mins
Write equation of continuity
A1V1 = A2V2
A1V1 = A2V2 = Constant
AV
ρAV
State one assumption made in deriving equation of continuity
no friction between layers of the liquid
The flow is calm
The fluid is compressible
The flow is steady
Find flow rate of a pipe whose cross-section area is 0.5m2 and flowing at a velocity of 20m/s.
10
40m3/s
10m2/s
10m3/s
How do we find mass flux
ρv
ρVA
ρA
VA
Water flows steadily along a horizontal pipe at a volume rate of 8x10-3m3s-1. If the area of cross-section of the pipe is 20cm2, calculate the velocity of the fluid.
4.0x10-8 m/s
4.0x10-4 m/s
40 m/s
4 m/s
Water flows steadily along a horizontal pipe at a volume rate of 8x10-3m3s-1. If the area of cross-section of the pipe is 20cm2, calculate the velocity of the fluid.
4.0x10-8 m/s
4.0x10-4 m/s
40 m/s
4 m/s
The window and door of a house are both left open during a windy day. The door which opens inwards, tends to slum shut when it is slightly ajar. Explain.
Wind blew at a low velocity from inside hence increasing pressure inside pushing the door to shut
Wind blew at a high velocity from outside hence decreasing pressure outside causing door to shut
Wind blew at a low velocity from outside hence increasing pressure inside pushing the door to shut
All the above
It is dangerous to stand close to a railway line on which a fast moving train is passing. Explain.
Train has magnets which can pull one into rails
A strong wind blows once a train passes hence pushing one backwards which may result to injury
As train passes at high speed, pressure around it reduces hence one can be sucked into the rails
One can cause accident
State Bernoulli's principle as an equation
The pressure, the kinetic energy per unit volume and the potential energy per unit volume of the fluid is a constant
The pressure, the kinetic energy and the potential energy per unit volume of the fluid is a constant
sum of the pressure, the kinetic energy per unit volume and the potential energy per unit volume of the fluid is a constant
sum of the pressure, the kinetic energy per unit volume and the potential energy per unit volume of the fluid are equal
State Bernoulli's principle as an effect
increase in speed produces a corresponding decrease in pressure
increase in velocity produces a corresponding decrease in pressure
increase velocity produces a corresponding increase in pressure
Decrease in velocity produces a corresponding decrease in pressure it exerts
Another name for laminar flow
Eddie flow
Zig Zag flow
Streamline flow
None of the above
Some liquid flows inside a pipe with a cross-sectional area of 0.02 m2. The liquid flows at 13 kg/s and has a density of 1 200 kg/m3.Calculate the flow speed through the pipe in meters per second.
0.54 m/s
0.26 m/s
3.85 m/s
1.85 m/s
State two types of fluid flow
turbulent and laminar
turbulent and steamline
whirls and eddies
streamline and laminar
Define the term fluid
Liquid and magma
Liquid and powder
Liquid and gases
Gases
Write the formula used to calculate flow rate
F=AV
F=AV2
F=PA
F=Mg
Which of these statements is correct
Trees and grass growing along the road always grow bending towards the road.
Ships have to pass a distance away from each other to avoid collision.
If two pieces pf paper are placed close to each other and air blown between them the two papers close in towards each other.
All of the above
the quantity of liquid flowing through a certain cross-sectional area of a tube in 1second is
steady flow
streamline
flow rate
turbulent flow
A liquid flow through a system of two connected tubes at a rate of 4 liters per minute. It gets out from the end of the second tube at a speed of 7 meters per second. Find the cross-sectional area of the second tube.
9.52×10−6 m2
9.52×10−3 m2
5.71×10−4 m2
5.71×10−5 m2
