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What is the energy of a 15 pounds 2x4 traveling at 100 mph and how does it compare to a high power rifle bullet with an energy of 2339 ft-lbf?
Wiki User
∙ 14y ago
The formula for kinetic energy is KE=1/2(mass)(velocity)^2, therefore 15 lbs travelling at 100 MPH has a kinetic energy of 5,012 ft lbs or more than twice that of the bullet! To get the answer you have to convert 15 lbs to mass by dividing by the gravitational constant (32.2 Ft/sec^2) and converting 100MPH to ft/sec. 15x(100x1.467)^2/(2x32.2)=5,012
Wiki User
∙ 14y ago
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All else being equal, the one that has more foot pounds of energy.
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How much energy is in one gallon of gas, compare this to quantity of energy in one gallon of rocket fuel, voila, your answer!!!
How many FPS does 1000 Foot-Pounds translate to?
That is sort of like asking how many miles per hour does 100 horsepower equal. Ft lbs is energy, and FPS is speed. There IS a formula to calculate the energy (in foot lbs) of a bullet, but to use that, you need to know SPEED in FPS, and WEIGHT (in grains) of the bullet. A 40 grain bullet at 1000 fps is pretty weak. A 400 gr bullet at 1000 fps can drop a moose.
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What is 0.7376ft lb. in energy?
That IS the energy, since foot times pounds (pounds as a unit of force) is energy.
How do you compare 1 and a quarter pounds in kilograms?
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260 grains is equal to 0.037 pounds.
Is 1600 bigger or smaller than 10lb?
You can't compare that. You can compare pounds with pounds; or pure numbers with pure numbers.
