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Delicious77 [7]
3 years ago
8

Show that atmosphere exerts pressure.

Physics
1 answer:
tensa zangetsu [6.8K]3 years ago
7 0

Explanation:

Put in some little water in a can and boil it until all the water evaporates. While being careful, cover the can with its lid so that it is airtight. Pour very cold water on the can and you'll observe the can crumbles inwards. This is due to atmospheric pressure which is higher on the outside of the can than inside.

Another observation is during siphoning.  Put one end of a pipe inside a tank with water and suck out the air in the pipe on the other end (Remember the end you suck on must be at a lower level than the water level in the tank – this creates a potential difference). You notice that when sucking out all the air in the pipe and the water starts exiting the end, it continues to draw water from the tank with no more sucking. This is also due to atmospheric pressure applying to the water in the tank.

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What must be the orbital speed of a satellite in a circular orbit 740 km above the surface of the earth?
BigorU [14]
The formula for orbital speed v is    v=(G*Me/r)^1/2
Wher G= 6.67E-11,    Me= 6E24,    r= Re+h= 6.4E6+740000
putting values in the formula we get

v= 7486.7 m/s     or  v= 7.4867 km/s
3 0
4 years ago
Who discovered laws of gravity and motion? He discovered aspects of light and color, leading to today's spectrum analysis
Vitek1552 [10]

Answer:

Sir Isaac Newton

Explanation:

The laws according to which bodies move and how one body attracts another body were developed by Newton. The three laws of motion and the law of universal gravitation were developed by Newton.

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5 0
3 years ago
True or false nodes and antinodes occur in longitudinal waves
Vlad [161]
I believe it is false because longitudinal waves travel parallel to the vibration
8 0
3 years ago
Can someone please answer this? I am really lost.
ki77a [65]

Answer:

8.0 rad/s

Explanation:

I₁ = 1.0 kgm², ω₁ = -20.0 rad/s (clockwise is positive direction)

I₂ = 4.0 kgm², ω₂ = 15.0 rad/s

Angular momentum conservation:

I₁ω₁ + I₂ω₂ = (I₁ + I₂)ω

1.0 x (-20.0) + 4.0 * 15.0 = (1.0 + 4.0)ω

40.0 = 5.0ω

so ω = 8.0 rad/s

5 0
3 years ago
What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ?
Luden [163]

Answer:

b. 20%

Explanation:

Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.

η=(Q₁-Q₂)/Q₁×100%

η is efficiency, Q₁ is the energy intake, Q₂ is energy wasted.

The information provided is:

Energy intake = 400 J

Work done = 80 J = (400-320) =Q₁-Q₂

Energy wasted =320 J

η= 80/400×100%

=20%

6 0
3 years ago
Read 2 more answers
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