Physics Quiz! Quiz Test About Your Knowledge Of The Physics!

1. If a fluid enters one end of a pipe at a certain rate, then fluid must also leave at the same rate.

TRUE

FALSE

This statement is based on the principle of conservation of mass. According to this principle, the mass of a closed system remains constant over time, meaning that the amount of fluid entering a pipe must be equal to the amount of fluid leaving the pipe. Therefore, if a fluid enters one end of a pipe at a certain rate, it must also leave at the same rate.

Explanation

This statement is based on the principle of conservation of mass. According to this principle, the mass of a closed system remains constant over time, meaning that the amount of fluid entering a pipe must be equal to the amount of fluid leaving the pipe. Therefore, if a fluid enters one end of a pipe at a certain rate, it must also leave at the same rate.

2. Who developed Bernoulli’s principle?

Daniel Bernoulli

Daniell Bernoulli

Daniele Bernoulli

David Bernoulli

Daniel Bernoulli developed Bernoulli's principle.

Explanation

Daniel Bernoulli developed Bernoulli's principle.

3. Bernoulli’s Principle states that:

As the speed of a moving fluid increases, the pressure within the fluid decreases.

As the speed of a moving fluid decreases, the pressure within the fluid also decreases.

As the speed of a moving fluid increases, the pressure within the fluid also increases.

None of the above

Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. This is because as the fluid moves faster, it has to travel a longer distance in the same amount of time, causing the fluid particles to spread out and exert less force on the surrounding area. This decrease in pressure is what allows airplanes to fly and water to flow through pipes.

Explanation

Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. This is because as the fluid moves faster, it has to travel a longer distance in the same amount of time, causing the fluid particles to spread out and exert less force on the surrounding area. This decrease in pressure is what allows airplanes to fly and water to flow through pipes.

4. What state of matter does Bernoulli’s Principle apply to?

Gas only

Liquid or gas

Liquid only

None of the above

Bernoulli's Principle applies to both liquids and gases. It states that as the speed of a fluid increases, its pressure decreases. This principle is based on the conservation of energy and can be used to explain various phenomena such as lift in airplanes, the flow of blood in arteries, and the operation of atomizers and carburetors. Therefore, the correct answer is "Liquid or gas."

Explanation

Bernoulli's Principle applies to both liquids and gases. It states that as the speed of a fluid increases, its pressure decreases. This principle is based on the conservation of energy and can be used to explain various phenomena such as lift in airplanes, the flow of blood in arteries, and the operation of atomizers and carburetors. Therefore, the correct answer is "Liquid or gas."

5. It is the volume of fluid per second that flows through a tube.

Fluid density

Mass flow rate

Volume flow rate

Mass flow rate

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Explanation

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6. Water circulates throughout a house in a hot-water heating system. If water is pumped out at a speed of 0.50 m/s through a 4.0 cm diameter pipe in the basement under a pressure of 3.0 atm, what will be the flow speed and pressure in a 2.6 cm diameter pipe on the second floor 5.0 m above? Assume pipes do not divide into branches.

2.5 x 105N/m2

1. 5 x105 N/ m2

2.5 x 103 N/m2

None of the above

Solution:
First calculate the flow speed on the second floor, calling it v2, using the equation of continuity. We can call the basement point 1.
v2 = (v1A1) / (A2) = (v1π(r1)2) / (π(r2)2) = (0.50 m/s)(0.020 m)2 / (0.013 m)2 = 1.2 m/s
To find pressure, we use Bernoulli’s equation:
P2 = P1 + ρg(h1– h2) + ½ρ((v1)2 – (v2)2)

Explanation

Solution:
First calculate the flow speed on the second floor, calling it v2, using the equation of continuity. We can call the basement point 1.
v2 = (v1A1) / (A2) = (v1π(r1)2) / (π(r2)2) = (0.50 m/s)(0.020 m)2 / (0.013 m)2 = 1.2 m/s
To find pressure, we use Bernoulli’s equation:
P2 = P1 + ρg(h1– h2) + ½ρ((v1)2 – (v2)2)

7. It is the mass of fluid per second that flows through a tube.

Volume flow rate

Mass flow rate

Fluid flow rate

Fluid density

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Explanation

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8. What is the lift (in newtons) due to Bernoulli’s principle on a wing of area 86 m² if the air passes over the top and bottom surfaces at speeds of 340 m/s and 290 m/s, respectively?

F=2.99 x 106 N

F=1.25 x 105 N

F = 1.7 x 106 N

None of the above

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Explanation

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9. Water at a gauge pressure of 3.8 atm at street level flows in to an office building at a speed of 0.06 m/s through a pipe 5.0 cm in diameter. The pipes taper down to 2.6cm in diameter by the top floor, 20 m above. Calculate the flow velocity and the gauge pressure in such a pipe on the top floor. Assume no branch pipe and ignore viscosity.

P2 = 3.28 x 105 Pa

P2 = 1.28 x 105 Pa

P2 = 2.8 x 105 Pa

P2 = 2.8 x 103 Pa

Solution:
By continuity equation:
v2 = (A1v1) / A2 = (π (5.0 / 2)2 (0.60) ) / ( π (2.6 / 2)2)

v2 = 2.2 m/s
By Bernoulli’s Equation:
P1 + ρgh1 + ½ρ(v1)2 = P2 + ρgh2 + ½ρ(v2)2 (Po = atmospheric pressure)

Explanation

Solution:
By continuity equation:
v2 = (A1v1) / A2 = (π (5.0 / 2)2 (0.60) ) / ( π (2.6 / 2)2)

v2 = 2.2 m/s
By Bernoulli’s Equation:
P1 + ρgh1 + ½ρ(v1)2 = P2 + ρgh2 + ½ρ(v2)2 (Po = atmospheric pressure)