Q:

# How many pounds of thrust are in one horsepower?

A:

The Oxford Dictionary defines horsepower as a unit of power equal to 550 foot-pounds per second. Because horsepower represents the total produced power of a system, however, it is not directly relatable to thrust.

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Thrust is calculated by subtracting absorbed power from produced power; therefore, is calculated on a per-situation basis. For example, to determine the thrust produced by a car, you must know not only the air resistance created by the car's body but also the dynamic friction of its tires on the ground and even the energy lost by the vehicle's drive-train.

Because horsepower is defined as force-over-distance over time, the best way to envision it is as the energy put into a system. Because thrust is defined as the energy exerted by a system in motion, the best way to picture it is as the output of a system. Together, you cannot calculate the produced thrust without knowing the system that is transmitting the energy.

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## Related Questions

• A:

The 2015 Jeep Compass comes with a 2-liter engine with a power of 158 horsepower at 6,400 revolutions per minute, and a torque of 141 foot-pounds at 5,000 revolutions per minute. The car is a front-wheel-drive with a five-speed manual transmission.

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• A:

Converting from 51 kilograms to pounds can be solved as a simple unit conversion problem, so long as you know what the conversion factor between pounds and kilograms is. There are 2.2046 pounds for every kilogram and .454 kilograms for every pound. These can be written as fractions: 2.2046 lbs/1 kg (also, 1 kg/2.2046 lbs) or 1 lb/.454 kg (also, .454 kg/1 lb).

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• A:

Converting from pounds to kilograms or vice versa requires knowing only a couple of basic things: the conversion factor between pounds and kilograms and how to apply a simple unit conversion problem as well as basic multiplication and division arithmetic. The conversion factor is 2.2046 pounds per kilogram or 0.454 kilograms per pound.