Fluid Dynamics

If petrol mixes with engine oil in a 4 stroke engine then the mixture becomes thick and its combustion will not be efficient. The exhaust will be smoky due to this incomplete combustion. also this will reduce engine efficiency.

I'm having trouble finding the relation between velocity and time given this formula. If anyone has a solve for this, It would be great if you took your time to help me as I know this includes differential acceleration, which requires calculus. As velocity increases, drag force increases - until terminal velocity.

F=1/2 * p * v^2 * C * A

p is density of fluid and is set to 1.225 kg/m^3

v is velocity of object relative to fluid

C is Coefficient of Drag and is set to 0.9, as my shape is a sphere

A is cross-sectional area which is π/4, as it is the "CS" of a sphere where diameter of "CS" circle in sphere is 1.

From my knowledge, I was only able to proceed this far:

Lets assume 1/2 * p * v^2 * C * A=ma1

Lets assume k=1/2pC (A is not included because I'll be comparing graphs with different values for A)

F=ma is the Net Force

g=9.80665m/s/s

F=mg

mg-ma1=ma

Force of gravity-Force of Drag=Net Force.

mg - 1/2 * k * v^2 * A = ma

g - (1/2 * k * v^2 * A) / m = a

How do I proceed? Do I differentiate a for dv/dt and integrate it later? I suck at calculus and I don't understand much of its logic, please help. If you have extra time, please give me a graph for velocity given time and acceleration given time.

The bubbles can never be of square shape for surface tension reasons as well as the reason that the pressure inside the bubble is distributed equally through all directions.

To double the pressure, you will need double the temperature. Note that you have to use the absolute temperature (usually Kelvin) for this calculation. So, for example, if you start off at 100 degrees Celsius, you convert that to Kelvin (add 273 to convert from Celsius to Kelvin), double the number to get double the temperature, then convert back to Celsius (subtract 273 from the previous result).Similarly, if you start out at a certain number of degrees Fahrenheit, you must first convert that to Kelvin, then double the result, and finally convert this last result back to Fahrenheit.

Many business jets, regional commercial aircraft, helicopters, etc. generally thought of as "smaller" aircraft typically utilize a battery and electric start motor similar in concept to the way a car is started. The sequence typically is:

1) Ignitors (e.g. spark plugs) are turned on

2) The electric starter (which is mounted on a gearbox) is turned on

3) Rotational power is transmitted through the gearbox to a tower shaft

4) The tower shaft is connected to a bevel gear on the engine shaft. In a multi-shaft engine the bevel gear rotates the high speed rotating group or high spool.

5) When the high spool reaches 15 to 20% of maximum speed, fuel is scheduled to the combustor.

6) The fuel ignites and begins to add rotational power to the high spool as the hot gases expand through the turbine.

7) As speed increases, the torque supplied by the start system decreases and the torque supplies by the fuel via the turbine increases.

8) The starter generally cuts out when the high spool reaches 50% of maximum rotational speed and the turbine continues to accelerate the rotor until idle speed is reached, concluding the start sequence.

9) Compression system bleeds are open initially and generally stay open throughout the start sequence.

10) High compressor vanes are generally on their closed stop initially and can begin to open as the engine proceeds to idle speed.

The process is similar for larger engines with the battery being replaced by a small gas turbine engine (called and APU or auxiliary power unit) and the electric start motor being replaced by an air turbine starter. They perform the same function as in the above process utilizing pneumatic instead of electric power.

There are other methods of supplying starting power for military engines such as hydraulic (instead of pneumatic) powered systems, explosive cartridge starters, and the very uncommon impulse or impingement of air on turbine blades.

Air can also be cross bleed from other engines when one main engine is already running to power the pneumatic start systems.

In-flight when an engine needs to be restarted and the high spool can reach 15 to 20% rotational speed from inlet air (RAM air), there is no need to employ the starter. There is a defined envelope as to when this process can be used. Cross bleeding is another option of in-flight restarts.

To demonstrate atmospheric pressure.

When the buoyant force is equal to the force of gravity, the object will float at a constant position in a fluid. This is known as the principle of buoyancy, which states that the buoyant force acting on an object in a fluid is equal to the weight of the fluid displaced by the object.

you could use a spring behind your object, and calculate inline reaction force from deflection.

it will be essential the wind speed is accurately measured

force will represent wind velocity squared *drag coefficient , once calculated the drag coefficient can be used elsewhere, in acceleration calculations for instance.

measuring forces versus wind speed should produce a exponential graph in the form f = v^2 as drag force is proportional to square of velocity

if you translate the action into freefall , at terminal velocity the forces balance,

down = mass * gravity acceleration ( newtons)

up = velocity ^2 * drag coefficient (newtons)

Yes it does, depending on the specific gravity of the liquid, and what makes the object "bouyant". I enquote this as a nitrogen blown wetsuit would not be bouyant in a Hydrogen atmosphere. I refer you to Archimedes on this one. [[User:Cjonb|Cjonb]] 00:27, 3 Jun 2008 (UTC)

False. Objects sink in water when the buoyant force acting on them is less than the weight of the object. This can happen if the object is denser than water or if it is not shaped in a way to displace enough water to counteract its weight.

When pushing water through "rural class B poly pipe" The maximum flow you can achieve is 80lpm. However if you have the pipe running for 100m in length you loose 30lpm through friction loss. So at the end of the 100meter pipe you would only achieve 50lpm.

This is comparable to two people pushing an object in opposite directions; if one pushes with more force than the other, the object will move in that direction (the direction in which more force is applied).Note that pressure is force per unit area.

It depends upon the frequency of the notes being played.

Its wavelengths could lie anywhere in the sound spectrum, depending upon the instrument and the artist; from 5 to 10 Hertz ( means 5 to 10 cycles [oscillations of an air wave { passage, past a point in space, by Air that is at times compressed and alternately at times rarified } ] per second ) - up to 15,000 oscillations per second, or Hertz; the approximate maximum upper limit of human auditory capacity.

Sucking on the straw reduces the air pressure inside it. This allows 'natural' air pressure to push down on the liquid in the container, causing it to rise up the straw..

PCA may be used by children as young as seven years old.

Yes, water is compressible, but to such a small degree that it is considered uncompressible. An example of this is that "A mile under water gives about 150 atmospheres of pressure... [which is] less than 1 percent compression" (Department of Physics: University of Illinois at Urbana-Champaign).

When you suck from a straw you create a partial vaccuum which reduces the air pressue inside the straw. The air pressure outside the straw pushes down on the milk and forces it up through the straw.

I think it may be because the inside of our mouths are hot, so cold feels better, and the outside of our body is sensitive to cold more than hot, so warm showers feel better. Just my opinion though.

Air unlike brake fluid can be compressed. When there is air in the brake system it compresses when you apply the brakes. This causes a loss of brake pressure on the brake pads and results in much longer stopping distances. This is dangerous and will cause an accident.

with the help of infrared rays camera

Artesian water come from a well the is dug in the earth..when the well is dug, the internal pressure from the hole causes the water to burst forth spontaneously from the well like a fountain.

turbine blade angle is that angle with which,a high presseure & high temprature steam is made to empenge on it.

In platform tennis and racquetball, players can use the law of reflection to predict how the ball will bounce off the court walls, helping them anticipate its trajectory for better positioning and shot selection. In pool, players can use the law of reflection to calculate angles and rebounds off the pool table cushions, aiding in strategic shot-making and improving overall accuracy.