What is Tank: Definition and 735 Discussions

A tank is an armored fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armor, and good battlefield mobility provided by tracks and a powerful engine; usually their main armament is mounted in a turret. They are a mainstay of modern 20th and 21st century ground forces and a key part of combined arms combat.
Modern tanks are versatile mobile land weapons platforms whose main armament is a large-caliber tank gun mounted in a rotating gun turret, supplemented by machine guns or other ranged weapons such as anti-tank guided missiles or rocket launchers. They have heavy vehicle armor which provides protection for the crew, the vehicle's munition storage, fuel tank and propulsion systems. The use of tracks rather than wheels provides improved operational mobility which allows the tank to overcome rugged terrain and adverse conditions such as mud and ice/snow better than wheeled vehicles, and thus be more flexibly positioned at advantageous locations on the battlefield. These features enable the tank to perform well in a variety of intense combat situations, simultaneously both offensively (with direct fire from their powerful main gun) and defensively (as fire support and defilade for friendly troops due to the near invulnerability to common infantry small arms and good resistance against most heavier weapons), all while maintaining the mobility needed to exploit changing tactical situations. Fully integrating tanks into modern military forces spawned a new era of combat: armored warfare.

Until the arrival of the main battle tank, tanks were typically categorized either by weight class (light, medium, heavy or superheavy tanks) or doctrinal purpose (breakthrough-, cavalry-, infantry- or reconnaissance tanks). Some being larger and very heavily armored and with large guns, while others are smaller, lightly armored, and equipped with a smaller caliber and lighter gun. These smaller tanks move over terrain with speed and agility and can perform a reconnaissance role in addition to engaging enemy targets. The smaller, faster tank would not normally engage in battle with a larger, heavily armored tank, except during a surprise flanking manoeuvre.

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  1. G

    Compressible air flow from a tank through a regulator

    This is probably a simple question but I am really struggling as to where to start. We have a tank of compressed air, Volume of tank (V1) = 0.2litres Pressure of tank (P1) = 206.8 bar Regulator Pressure (P2) = 58.6 bar I would like to find the volume of air that can pass through the regulator...
  2. D

    Bernoulli's equation and water exit speed from tank opening

    Homework Statement Use Bernoulli’s equation to calculate how fast the water emerges from the open tap (at position 2) in the figure(a). You may assume that the water at position 1 moves negligibly slowly (b) The tap is rotated to create a fountain as shown in (b) Calculate the maximum height h...
  3. P

    Use of subsurface foam injection on covered IFR tank

    According to NFPA 11, subsurface foam injection can't be used on IFR tanks with fixed/covered roof. However, this has been done for a long time by various companies and there doesn't seem to be any issues with that. Can anyone give their opinion based on knowledge/experience why this should not...
  4. jtbell

    News If you're in eastern USA, fill up your gas tank

    East Coast faces gas shortages, price hikes after pipeline leak (CNN.com) That pipeline passes about 20-30 miles from here. This morning I stopped at my usual gas station, one of the cheapest around here. There were more people there than usual, and a couple of the pumps had gone empty. While...
  5. Graaf van Vlaanderen

    I What is the gas composition in a tank with a SF6 leak?

    We discovered a leak in a SF6 gas HV circuit breaker. Since we don't know when the leak occurred due to temperature changes I assume there is only air left in the tank. Here is my question. Suppose I have a tank with a fixed volume filled with air at the same pressure as the atmospheric...
  6. F

    Breathing under water (long snorkel tube and scuba tank)

    Hello Forum, Humans breath by inhaling and exhaling air at 1 atm of pressure (which is ~15lbs/in^2). Air pushes from the outside on every inch of our body with a force of 15lbs but an equal force is pushing from the inside. The net force is zero. The water pressure increases linearly with...
  7. F

    What is the value of y in this water tank pressure problem?

    Homework Statement i am asked to find the value of y in this question . I am not sure should i consider the atmospheric pressure acting on the mercury or not . Homework EquationsThe Attempt at a Solution i choose to consider the atmospheric pressure as 0 in this case . So , my working is...
  8. Parsifal1

    Calculate mass of tank floating in freshwater

    Homework Statement A rectangular tank contains 6L of freshwater, has a floor area of 0.3m^2 and floats upright in freshwater. If the bottom of the tank is 150mm below the surface of the water, calculate the mass of the tank. Homework Equations F=P*A=pgAh The Attempt at a Solution...
  9. P

    How to Calculate Gas Usage in Pressure Drop Situation?

    Homework Statement Pressure drops in welders tank of oxygen gas from p1=150atm to p2=120atm . How much of the gas will be used ? Homework Equations The Attempt at a Solution In my mind the simplest way of looking at this problem is to consider the process isothermal. But then the volume of...
  10. K

    Maintaining a constant volume of water in a tank

    I have water draining from a tank A into a tank B through a hole (or short pipe) and then being pumped back from B to A. If I know the rate of the pump (say 19 liters per minute), what should the diameter of the hole be so that the volume of tank A remains the same? The actual volume of A is...
  11. A

    Pressure in tank pipe -- Bernoulli Equations

    Homework Statement [/B] A pressurized cylindrical tank, 5m in diameter, contains water which emerges from the pipe at point C with a velocity of 25 m/s. Point A is 10m above point B and point C is 3m above point B. The area of the pipe at point B is 0.07 m2 and the pipe narrows to an area of...
  12. M

    Expression for the change in water height in a tank

    Homework Statement Homework Equations The Attempt at a Solution There is solved problem on change in water height with respect to time. I understand it but there is the b part of the question. It asks that what's if the top of the tank is open to the atmosphere? I think nothing would...
  13. R

    Tank tracks treads friction coefficient

    What kind and value is the friction coefficient of tank tracks on the move, when force is applied forward in the direction of the tracks movement? Is the friction coefficient in that case, closer to kinetic/sliding coefficient or to a rolling resistance coefficient? What about the sideways...
  14. A

    Velocity of efflux out of a water tank

    Homework Statement A container of height H has a orifice at a distance h from the top, the ratio of the cross section area of container and orifice is. 1, find velocity of efflux Homework Equations Using Bernoullis equation we get v=(2gh)^.5 Equation of continuity A1V1=A2V2 The Attempt at a...
  15. P

    Can you use a tank circuit to produce an AC circuit?

    Since the resonant frequency of a tank circuit, is completely adjustable, and controlled by the value inductor and capacitor you use, I was wondering if it had any other uses, other than increasing its impedance at its resonant frequency. Can if be used to produce ac signals of its resonant...
  16. F

    Pressure in Closed Tank | Is the Author Wrong?

    Homework Statement in this question , the author stated that the P1 = P atm , but at point 1 , the gas tank is not open to the atmosphere, it is a closed tank . so , is the author wrong ? again , at point 2 , the tank isn't open to atmosphere, why it is P2= P atm ? Homework EquationsThe...
  17. The-Mad-Lisper

    An Open Cylindrical Tank of Acid....

    Homework Statement An open cylindrical tank of acid rests at the edge of a table 2.20\cdot 10^0\ m above the floor of the chemistry lab. If this tank springs a small hole in the side at its base, how far from the foot of the table will the acid hit the floor if the acid in the tank is...
  18. T

    Working Out Shaft Torque in a Stirred Tank with a Cylindrical Shape

    Here is some background to the problem (in a stirred tank): "With yield stress non-Newtonian (viscoplastic) fluids, it is possible to generate an agitated volume around the impeller, defined as a cavern, surrounded by a stagnant region where the shear stress is insufficient to overcome the...
  19. UMath1

    I Tank Drainage Velocity: Does Area Matter?

    Using Bernoulli's equation to calculate the velocity of fluid draining from a tank seems to give no weightage to the area of the drainage hole. But based on the mass continuity principle, the area of the hole should have an impact. Does the area of a drainage hole have an impact on the fluid...
  20. Biker

    Work Done to Move Water & Fold Iron Chain

    Homework Statement A cylinder water tank its radius 0.5 m, its height is 2 m and it is full of water. Determine the work done to move the water to a height of 4 meters above the height of the cylinder water tank. Another question related to it is: An uniform iron chain its length is 10 m and...
  21. T

    Water tank level control system

    I have a project to build a water level control system. Basically I will have two sensor probes one connected near the bottom and the other near the top. When the water level goes below the bottom sensor it will trigger a pump to pump water back into the tank until it reaches the top sensor...
  22. C

    Frequency of Vibration of a water tank

    Homework Statement Assume that there is a tank on a 200 ft pedestal type support. When full the tank and contents have a weight of 50,000 lbs and it is never drained to a point where the tank and contents have a weight less than 20,000 lbs. Assume the pedestal weight is negligible compared to...
  23. D

    Can I Connect Tank 1 & Tank 2 to Create a Water Level Difference?

    I am currently working on something and I would like to know something. When we connect two tanks and we have water flowing into Tank 1. Is it possible to make a connection between Tank 1 and Tank 2 so the water level in Tank 2 is higher than water level in Tank 1?
  24. kartmaze

    Steady State Flow out of a Tank Through a Vertical Pipe

    This is not homework, but something work-related. However, I will post it here since it's homework-relatable. 1. Homework Statement Known variables: Qin , A (and obviously the diameter D of the pipe as well as g = 9.81 m/s2). The pipe outlet and the top of the tank is at atmospheric...
  25. mudweez0009

    Tank Mass Balance Calculation for Designing w/ Automatic Float Switch

    I'll be using a mass balance calc for a tank design at work. We are designing a tank that has an automatic float switch on it, attached to a valve which will start filling the tank when the water level drops below a certain point. This tank is intended to drain quickly (flow rate not known at...
  26. E

    Ball in accelerating tank with fluid

    T1. Homework Statement a wooden ball of mass m is kept inside water by the help of a massless string shown in the figure. One end of the string is fixed at the bottom of the vessel. when the vessel containing the water is accelerated upwards with acceleration a , will the tension increase and...
  27. jdawg

    Fluid Mechanics: Cart and tank of water

    Homework Statement A cart has a tank of water on it which has a nozzle. Water jets out from the nozzle onto a turn vane oriented at theta = 30° which deflects the flow upward. The cart is held stationary by a rope as shown in the image below. Find the force in the rope if the velocity of the...
  28. SpiffyPhysics

    Pressure 2 m deep in a tank full of water

    Homework Statement In a tank full of water, the pressure on a surface 2 meters below the water level is 1.5 kPa. What is the pressure on a surface 6 meters below the water level? Homework Equations Isn't this impossible? The equation given is P=hdg. (height of water column x density x...
  29. H

    Vertical rise of liquid at the back of a linearly accelerating tank....

    Homework Statement why the vertical rise of the surface is given by the formula as shown in the notes ? shouldn't it = Δs = (g +az ) Δx / ax ? Homework EquationsThe Attempt at a Solution
  30. M

    Determine supersonic flow velocity, tank to regulator topipe

    Hello All, I am trying to figure out the solution to a problem I am trying to do for fun. I've been trying this for a while and has annoyed me so any help is greatly appreciated! I attached a picture of the problem/ control area to help...
  31. R

    Thrust of an underpressure tank of air

    How can I calculate the thrust of an underpressure tank of air when the valve is released? If you can, please, explain in detail. Thank you!
  32. Ian Limjap

    Fluid Mechanics: Tank problems.

    Homework Statement In the attached file. Homework Equations P1/rhoe+v1^2/2+gh1=P2/rhoe+v2^2/2+gh2 The Attempt at a Solution I do not know how to begin it; however, I think part(iii) is the same as part (iv)[/B]
  33. B

    (Thermodynamics) A tank with water & air heated

    Homework Statement For a rigid, impervious, closed tank - The volume of tank is filled with 70% water and the rest is with air- The initial temperature of the tank is 20 °C, and the absolute pressure is 1 bar. - What would be the final pressure if we raise the temperature to 200 °C? Homework...
  34. E

    Heat Transfer calculation for Tank and piping system

    Having difficulty remembering how to model a simple heat transfer equation for a liquid tank/piping system and wondering if anyone can provide some quick help. I have a 1000L tank of water that is heated by a 1kW heater (target temp of 43°C). The piping system (outside of the tank), holds 100L...
  35. I

    Acoustic impedance water surface in partially filled tank

    Hello guys, Consider a partially filled tank with water where the acoustic field can be described by the Helmholtz equation. The boundary condition at the water surface would be \frac{∂p}{∂\vec{n}} = -j\rho_0\omega\frac{p}{Z} where Z is the impedance of the water surface. What would be...
  36. gloppypop

    How Long to Fill Tank with 3 Pumps?

    Homework Statement Three pumps are attached to a three-dimensional tank. They pump water into the tank at a constant rate. Pump A when turned on alone fills up the tank in 15min. Pump B when turned on alone fills up the tank in 30min. Pump C when turned on alone fills up the tank in 60min...
  37. R

    Maintaining liquid level inside tank with inflow and outflow

    I have a tank which is 1320Litres. The constant outflow from the tank is 800Litres/Hr. I want to maintain the level of the water in the tank at a stagnant level and I need to find water rate of inflow at which I can achieve this equilibrium. Any help
  38. A

    Why LC tank only oscillates at resonant frequency?

    I am wondering why LC tank only oscillates at resonant frequency not other frequencies? Is there a physics explanation for that?
  39. S

    Time taken for pressurized tank to fill another chamber?

    Hi.. I am working on a project where I need pressurized air from one tank to fill another chamber at lower pressure. I have values for input pressure, required final pressure and diameter of the short flow pipe. I understand that the density and flow rate of air will keep on changing as the...
  40. C

    Symbolic Expression for Speed of Draining a Tank

    Hi, I've completed an experiment in which I measured the height of the water in the tank with time. I plotted my results on graph paper as a graph of height against time, resulting in a curve of decreasing gradient, slightly resembling that of the e^(-kx) graph. 1) I am asked to symbolically...
  41. M

    How does the physics work inside a vape tank? Picture included

    How does the physics in a vape tank work? Specifically, if I closed the airflow off and sucked from the top wouldn't it increase the pressure inside of the tank and allow the liquid to soak the cotton? http://imgur.com/7bZcdRI That may help confusion. I do not know physics terms.
  42. M

    A Calculating Drain Time of a Tank with Closed Outlet: What is the Formula?

    Experts, I need to calculate how long does it take to drain a tank through port in bottom of the tank, but not any other parts of this system is exposed to atmosphere. So as the tank drains, it creates negative pressure at top of the fluid inside the tank? any formula to calculate the time...
  43. C

    Determine conditions of water tank and pump

    1. The problem statement, all variables and given/know In rural communities where landowners have their own water wells, large tanks are used to store water, which is pressurized by a sealed “air cushion”. Water is pumped intermittently from the well to restore the tank supply when the level is...
  44. B

    Construction DIY Aquarium Tank Rack Shelving Stand

    G'day Forum Members, I'm new to the forum I hope to get some great advice here for my projects! I have a slow progress DIY tank rack project going on: short story I bought a cheap steel shelving system which won't cut it for the project, so I'm going to build a timber setup which will be a...
  45. J

    Thermodynamics -- total entropy generation during cooling of tank of water....

    Homework Statement A 0.2 m^3 steel container that has a mass of 30 kg is filled with liquid water. Initially both the steel tank and the water are at 50°C. Now heat is transferred, and the entire system (i.e., steel and water) cools to the surrounding air temperature of 25°C. Determine the...
  46. T

    If you were to empty a full tank 16 gallon tank of fuel, how

    I am kind of wondering how much for example CO2 you would put out or other greenhouse gases would be emitted everytime i use a full tank of gas. It would help me if you could explain it in volume, like how much it would take to contain the emissions on its own, and how much it would take to...
  47. D

    Thermodynamics problem -- Water pumped into an enclosed tank....

    Homework Statement Q3.1 (a) A pump forces 1m^3 /min of water horizontally from an open well to a closed tank where the pressure is 0.9 Mpa.compute the work the pump must do upon the water in an hour just to force the water into the tank against the pressure.sketch the system upon which the work...
  48. I

    Dissapating corner moments in a rectangular underground tank

    This is a conceptual question based on a project I and a few other engineers finished at work. We are replacing the roof of a concrete tank that is part of a larger pump station for a river. Unfortunately, the roof is very integral in this structure, which means that once it's removed, the walls...
  49. J

    Calc Air Pressure in Tank with Fluid Level & Height

    Homework Statement What is the headspace pressure (air)? Closed tank part filled with fluid under pressure, there are tubes that indicate the fluid level and pressure. The tube on the left is open to atmosphere. fluid s.g. 1.2 x = 5m y= 1.7m Homework Equations See below The Attempt at a...
  50. G

    Pressure and Flow Rate in a Tank

    Homework Statement A tank of cross-sectional area A is initially filled with fluid of density ρ and viscosity μ to height hi. The pressure above the fluid in the tank is atmospheric, Patm. At the base of the tank there are two pipes, which are both open to teh atmosphere, such that fluid...
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