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Tomtit [17]
3 years ago
10

Describe the action and reaction forces in propulsion devices.

Physics
1 answer:
aksik [14]3 years ago
6 0

Answer:

Hello!

I could help you on this ^^

Explanation:

Newton’s Third Law of Motion states, “When one object exerts a force on a second object, the second one exerts a force on the first that is equal in magnitude and opposite in direction.”

-This law is sometimes called the “Law of Action and Reaction”.

-Even though the forces are equal in magnitude (strength) and opposite in direction, they do not cancel each other.

This law addresses two objects, each with only one force exerted on it.

-Each object is exerting one force on the other object.

-Each object is experiencing only one force.

The action and reaction forces are reciprocal (opposite) on an object.

<u>Examples may include:</u>

<u>A swimmer swimming forward:</u>

The swimmer pushes against the water (action force), the water pushes back on the swimmer (reaction force) and pushes her forward.

<u>A ball is thrown against a wall:  </u>

The ball puts a force on the wall (action force), and the wall puts a force on the ball (reaction force) so the ball bounces off.

<u>A person is diving off a raft:</u>

The person puts a force on the raft (action force) pushing it, and the raft puts a force on the diver (reaction force) pushing them in the opposite direction.

A person pushes against a wall (action force), and the wall exerts an equal and opposite force against the person (reaction force).

(Not my words)

"The Space Shuttle engines push out hot gases (action force), and the hot gases put a force on the shuttle engines (reaction force) so the shuttle lifts (there is no sling shot doing it)"

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What inductance l would be needed to store energy e=3.0kwh (kilowatt-hours) in a coil carrying current i=300a?
myrzilka [38]

The formula for the energy stored in the magnetic field of an inductor is:

                      E  =  (1/2) (inductance) (current)²  .

In the present situation:

Energy = (3 kilo-watt-hour) x (1,000 / kilo) x (joule/watt-sec) x (3,600 sec/hr)

           =  (3 · 1000 · 3,600)  (kilo·watt·hr·joule·sec / kilo·watt·sec·hr)

           =      1.08 x 10⁷ joules .

Now to find the inductance:  

                   E  =  (1/2) (inductance) (current)² 

       (1.08 x 10⁷ joules) = (1/2) (inductance) (300 Amp)²

           (2.16 x10⁷ joules) =  (inductance) (300 Amp)²

             Inductance =  (2.16 x10⁷ joules) / (300 Amp)²

                              =   2.16 x10⁷ / 90,000        Henrys

                           I get        240 Henrys .

This is a big inductance.  Possibly the size of your house.
To get a big inductance, you want to wind the coil
  with a huge number of turns of very fine wire, in
  a small space.
In this case, however, if you plan on running 300A through
  your coil, it'll have to be wound with a very thick conductor ...
  like maybe 1/4-inch solid copper wire, or even copper tubing,
You have competing requirements.
There are cheaper, easier, better ways to store 3 kWh of energy.
In fact, a quick back-of-the-napkin calculation says that
  3 or 4 car batteries will do the job nicely.
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Answer:

A. Shear stresses are maximum at the neutral axis and normal stresses are maximum furthest from the neutral axis.

Explanation:

Normal stress :

Normal stress is defined as the stress or the restoring force that occurs on the plane when an external axial load is applied on it. For a beam the normal stress is maximum at the point furthest from the neutral axis and is zero at the neutral axis of the beam.

Shear stress :

Shear stress is a stress which occurs when the force acts on the surface of the member in a parallel direction. It changes the shape of the member.  For a beam, the shear stress is maximum at the neutral axis.

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