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Anon25 [30]
2 years ago
7

If a leaf falls from a tree, has work been done on the leaf? Explain.

Physics
1 answer:
mihalych1998 [28]2 years ago
5 0

Answer:

Hope this helps!

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On a vacation flight, you look out the window of the jet and wonder about the forces exerted on the window. Suppose the air outs
Anettt [7]

Answer:

The pressure difference is 25.8kPa while the force exerted on the window by air pressure is 3.02 kN

Explanation:

Using the Bernoulli's equation

P_{in}+\frac{1}{2}\rho v_{in}^2=P_{out}+\frac{1}{2}\rho v_{out}^2

Here

  • Pin-Pout is the pressure difference which is to be calculated.
  • ρ is the density of air whose value is 1.29 kg/m^3
  • vin is the velocity of air inside which is 0 m/s
  • vout is the velocity of air outside which is 200 m/s

Substituting values in the above equation yields

                                   \Delta P=P_{in}-P_{out}\\\Delta P=\frac{1}{2}\rho (v_{in}^2-v_{out}^2)\\\Delta P=\frac{1}{2}\times 1.29 ( 200^2-0)\\\Delta P=25.8 kPa

So the pressure difference is 25.8kPa.

As force is given by

                                          F=PA\\F=\Delta P A\\

Here

  • ΔP is the pressure difference calculated above
  • A is the area of the window given as

                                       A=L \times W\\A=0.26 \times 0.45\\A=0.117 m^2

Now force is

                                      F=\Delta P A\\F=25.8 \tiems 10^3 \times 0.117\\F=3.02 kN

So the force exerted on the window by air pressure is 3.02 kN

6 0
3 years ago
Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table. A 2
RoseWind [281]

Answer:

X,W,Y,Z

Explanation:

It is what it is. and i took the edge test

4 0
3 years ago
Energy from various sources is considered to have been derived from sun.Do you agree?Do justify.
Kruka [31]
Yes! with out the sun plants and animals wouldnt live right? therefore they get energey wich is passed on by food
3 0
3 years ago
Do electromagnetic waves require matter to travel?
VMariaS [17]

Answer:

No.

Explanation:

Electromagnetic waves do not require a medium of matter to move through, electromagnetic waves are used in things like your cell phone and telecommunications.

6 0
2 years ago
How long will it take to travel 200 km traveling 100m/s?
Damm [24]
Convert: 1km = 1000 m 200000 m * 0.01 s/m = 2000 s or 33 minutes and 20 seconds.
7 0
3 years ago
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