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Elena-2011 [213]

2 years ago

9

Why is my lawn mower not starting?

1 answer:

EleoNora [17]2 years ago

6 0

Answer:

Other possible causes include: Loose, Dirty or Disconnected Spark Plug in Your Lawn Mower: Check it out, clean off debris, re-connect and tighten. Dirty Air Filter: Clean or replace. Fuel Not Reaching the Engine: Tap the side of the carburetor to help the flow of gas.

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Air at 25 C and 1 atm is flowing over a long flat plate with a velocity of 8 m/s. Determine the distance from the leading edge o

DIA [1.3K]

Answer:

Explanation:

Given data

Temprature of air= $25^{\circ}$

pressure =1 atm

velocity(V)=8m/s

From the table for air at $25^{\circ}$ and 1 atm

kinematic viscosity $\left ( \nu\right )=1.562\times 10^{-5} m^{2}/s$

Reynolds number for turbulent flow $=5\times 10^{5}$

and Re.no.= $\frac{V \times X}{\nu }$

therefore length where turbulent flows start is

X= $\frac{\left ( Re.no.\right )\times \nu }{V}$

X=0.976 m

Thickness of boundary layer is given by

$\delta _x=\frac{5X}{\sqrt{Re_x}}$

$\delta _x=\frac{5\times 0.976}{\sqrt{5\times 10^5}}$

$\delta _x=6.901mm$

for water

kinematic viscosity $\left ( \nu\right )=8.91\times 10^{-7} m^{2}/s$

Reynolds number for turbulent flow $=5\times 10^{5}$

and Re.no.= $\frac{V \times X}{\nu }$

therefore length where turbulent flows start is

X= $\frac{\left ( Re.no.\right )\times \nu }{V}$

X=0.055m

Thickness of boundary layer is given by

$\delta _x=\frac{5X}{\sqrt{Re_x}}$

$\delta _x=\frac{5\times 0.055}{\sqrt{5\times 10^5}}$

$\delta _x=0.3889mm$

5 0

2 years ago

Read 2 more answers