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irakobra [83]
3 years ago
13

A long, vertical pipe (radius R) filled with an incompressible Newtonian fluid, is initially capped at its lower end. At some in

stant in time, the cap is removed and the fluid begins to flow. a) Simplify the Navier-Stokes equation that describes the axial flow velocity as a function of time and position within the tube. Be sure to include a complete set of boundary/initial conditions. b) Choose appropriate scale factors for the variables that remain in the simplified equations of (a). c) Make the equations and conditions of (a) dimensionless. d) From the dimensional analysis, obtain an estimate of: i) an estimate of the time it takes for the fluid to reach its steady-state velocity ii) a characteristic flow velocity in the tube. e) For an experiment using a specific Newtonian fluid in a pipe of radius 1mm, the flow reaches 95% of its steady-state values in 5 s. If a second Newtonian fluid, having identical density to the first but twice the viscosity was placed in a tube of radius 2 mm, how long will it take before 95% of steady-state is achieved
Physics
1 answer:
marysya [2.9K]3 years ago
7 0

Answer:

98........mmmmmmmmmmmmmmmm

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A driver drives for 30.0 minutes at 80.0 km/h, then 45.0 minutes at 100 km/h. She then stops 30 minutes for lunch. She then trav
bija089 [108]

Answer:

b) 68,9 km/h a) picture

Explanation:

In this problem, since velocity is expressed in km/h and time in minutes, we have to convert either time to hours or velocity to km/min. It is easier to use hours.

Using this formula we pass time to hours:

t_{hours}=t_{min}*\frac{1 h}{60 min}\\30min*\frac{1 h}{60 min}=0,5h\\45min*\frac{1 h}{60 min}=0,75h

Now we can plot speed vs time (image 1). The problem says that the driver uses constant speed, so all lines have to be horizontal.

Using the values of the speed we calculate the distance in each interval

d=v*t\\80km/h*0.5h=40km\\100km/h*0.75h=75km

Using these values and the fact that she was having lunch in the third one (therefore stayed in the same position), we plot position vs time, using initial position zero (image 2, distance is in km, not meters).

Finally, we compute the average speed with the distance over time:

v_{average}=\frac{155km}{2.25h}=68.9km/h

6 0
3 years ago
During a circus act, an elderly performer thrills the crowd by catching a cannon ball shot at him. The cannon ball has a mass of
olasank [31]

Answer:

3.416 m/s

Explanation:

Given that:

mass of cannonball m_A = 72.0 kg

mass of performer m_B = 65.0 kg

The horizontal component of the ball initially \mu_{xA} = 6.50 m/s

the final velocity of the combined system v = ????

By applying the linear momentum of conservation:

m_A \mu_{xA}+m_B \mu_{xB} = (m_A+m_B) v

72.0 \ kg \times 6.50 \ m/s+65.0 \ kg \times 0 = (72.0 \ kg+65.0 \ kg) v

468 kg m/s + 0 = (137 kg)v

v = \dfrac{468\  kg m/s }{137 \ kg}

v = 3.416 m/s

8 0
3 years ago
How does the change in the temperature of the universe provide evidence for universe expansion that supports the Big Bang Theory
xeze [42]

Question:

1) The universe is cooling which, according to the Big Bang Theory, is expected to happen as the cosmos accumulates.

2) The universe is warming which, according to the Big Bang Theory, is expected to happen as the cosmos disperses.

3) The universe is cooling which, according to the Big Bang Theory, is expected to happen as the cosmos disperses.

4) The universe is warming which, according to the Big Bang Theory, is expected to happen as the cosmos accumulates.​

Answer:

The correct option is;

3) The Universe is cooling which, according to the Big Bang Theory, is expected to happen as the cosmos disperses

Explanation:

With the temperature measurement carried out using the CSIRO radio telescope, Astronomers have been able to determine a temperature difference in the universe from 5.08 Kelvin 7.2 billion light years away to 2.73 Kelvin in the Universe today, which is in support of the Big Bang theory that as the Universe expanded from a state of extreme temperature that cools down as the Universe expands or the cosmos disperses.

8 0
3 years ago
The ability of the brain to change in response to experience is called____
galben [10]

Answer:

I think its structural plasticity.

6 0
3 years ago
Read 2 more answers
Elements that easily transmit electricity and heat display the property know as ______
andre [41]
It is known as conductivity
7 0
3 years ago
Read 2 more answers
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