Main Page

The poundal (symbol: pdl) is a unit of force that is part of the foot–pound–second system of units, in Imperial units introduced in 1877, and is from the specialized subsystem of English absolute (a coherent system).

$1\,{\text{pdl}}=1\,{\tfrac {{\text{lb}}_{m}\cdot {\text{ft}}}{{\text{s}}^{2}}}$

The poundal is defined as the force necessary to accelerate 1 pound-mass to 1 foot per second per second. 1 pdl = Template:Val exactly.

Background

English units require re-scaling of either force or mass to eliminate a numerical proportionality constant in the equation F = ma. The poundal represents one choice, which is to rescale units of force. Since a pound of force (pound force) accelerates a pound of mass (pound mass) at 32.174 049 ft/s² (9.80665 m/s²; the acceleration of gravity, g), we can scale down the unit of force to compensate, giving us one that accelerates 1 pound mass at 1 ft/s² rather than at 32.174 049 ft/s²; and that is the poundal, which is approximately Template:Frac of a pound force.

For example, a force of 1200 poundals is required to accelerate a person of 150 pounds mass at 8 feet per second squared:

$150\,{\text{lb}}_{m}\cdot 8\,{\tfrac {\text{ft}}{{\text{s}}^{2}}}=1200\,{\text{pdl}}$

Template:GravEngAbs The poundal-as-force, pound-as-mass system is contrasted with an alternative system in which pounds are used as force (pounds-force), and instead, the mass unit is rescaled by a factor of roughly 32. That is, one pound-force will accelerate one pound-mass at 32 feet per second squared; we can scale up the unit of mass to compensate, which will be accelerated by 1 ft/s² (rather than 32 ft/s²) given the application of one pound force; this gives us a unit of mass called the slug, which is about 32 pounds mass. Using this system (slugs and pounds-force), the above expression could be expressed as:

$4.66\,{\text{slug}}\cdot 8\,{\tfrac {\text{ft}}{{\text{s}}^{2}}}=37.3\,{\text{lb}}_{F}$

Note: Slugs (32.174 049 Template:Lbm) and poundals (1/32.174 049 Template:Lbf) are never used in the same system, since they are opposite solutions of the same problem.

Rather than changing either force or mass units, one may choose to express acceleration in units of the acceleration due to Earth's gravity (called g). In this case, we can keep both pounds-mass and pounds-force, such that applying one pound force to one pound mass accelerates it at one unit of acceleration (g):

$150\,{\text{lb}}_{m}\cdot 0.249\,g=37.3\,{\text{lb}}_{F}$

Expressions derived using poundals for force and Template:Lbm for mass (or Template:Lbf for force and slugs for mass) have the advantage of not being tied to conditions on the surface of the earth. Specifically, computing F = ma on the moon or in deep space as poundals, Template:Lbm·ft/s² or Template:Lbf = slug·ft/s², avoids the constant tied to acceleration of gravity on earth.

Conversion

Hostgator Review http://webhogwarts.altervista.org/groups/hostgator-kara-cuma/; Let's have a look on world's web hosting companies: Thousands and hundreds of internet hosts scattered worldwide and their company purpose is simple - to obtain recognized and make profit. With a lot sound around the hosting market, it is a challenging job for us to pick up the right hosting. It's not too difficult for me to find Hostgator - a hosting service that stood out from the rest with outstanding attributes. What I am going to perform in this article is to review Hostgator hosting in addition to exposing the technique of Hostgator success.

In any internet business, we depend on excellent internet hosts to offer stable and reliable web hosting services. Hostgator offers timely and promising qualities.

Hostgator offers a lot of plans to consumers. Nearly all the plans provided are cost effective. Hostgator shared hosting are charged $4.95 regular monthly for the basic shared hosting packaged. At charges which start from $9.95 yearly, you can delight in much more compact packages which really include a bunch of things. Although there still have a lot bundles which providing cheaper rates, however if you start to research and attempt Hostgator, you will feel that every dollar and cent you invested is just not squandered. Do your very own research on the attributes consisted of in every bundles Hostgator offering, then you can distinguish the distinctions with others plans offered by various other web hosts.

For exaple, Hostgator helps you to back up the internet sites promptly and securely. You have the option to host limitless domains, sub domains and FTP accounts. Of cause, the attribute which mentioned simply now will not be readily available if you are the basic hosting bundle customer.

Also, Hostgator provides control board as well. This function helps individuals to manage their domains and sub domains in more versatile way. Besides, the control panel trial which is available in basic provides the helpful help devices to new users. Out of many host worldwide, Hostgator's cpanel can be said succeeding the top position amongst them.

In term of consumer supports, Hostgator has an extremely strong customer care team which working 24/7 to help you take on all types of problems pertinent to their products. You can either call them with phone or live chat with them through net. You can also email your problems to them. They will feedback immediately without taking any fees. This is why previously, Hostgator still the very best selection for clients.

A last words for those who are starting - don't be scare by exactly what you are reading as developing an excellent website is not that difficult. The work is in fact pretty easy and direct as long as you're getting the right info. To obtain begun, you'll initially need a domain name and a trusted hosting service.

See also

Slug (mass)

References

• Obert, Edward F., “Thermodynamics”, McGraw-Hill Book Company Inc., New York 1948; Chapter I, Survey of Dimensions and Units, pages 1–24.

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.