How many calories / joules of energy does a person need per day?
Women: 1940 calories per day. Men: 2550 calories per day. And check this website out; http://www.webstation.com.au/extras/daily_calorie_requirements.htm
How do you convert Joules to horsepower?
Technically, you can't convert Joules to horsepower, since they are units of different measurements. Joules is a unit of work or energy, while horsepower is a unit of power, i.e. the time derivative of work. There must be a time interval specified somewhere. Thanks for the additional information. (a) 68kg, 60 meters, up a 30° slope, at 2.7m/s The work is equal to the gain in PE: W = m*g*h = 68*9.8*60*Sin(30) = 19992 joules (b) To cover 60m at 2.7m/s: x = v*t t = x/v = 60/2.7 = 22.2 seconds Power = W/t = 19992/22.2 = 899.6W There are 746W/hp Power = 899.6/746 = 1.21hp
How much energy in joules does an average healthy adult human brain consume in a year?
According to Scientific American, studies indicate that the human brain consumes about 12 watts, or an equivalent of 12 joule seconds. A year is 60 sec. times 60 min. x 24 hr. x 365 days equals 31,536,000 seconds. Multiply by 12 joules and you get just shy of 378 and one half million joules per year. It might sound like a lot, but it is about what a new LED bulb uses over the same year.
How many joules of energy is stored in an average human being?
(E)nergy = (M)ass X (C)speed of light, squaredSo a 70kg human being’s contained energy could be calculated like this (according to the formula above):70kg X 299,337km (or 186,000 miles if you're working in miles not kilometres) per second, squared = 89,602,639,569By this reckoning a 70kg human being would contain a total of:89,602,639,569 Joules or 89,603 MegaJoulesIF this is correct, and from what I can gather, it is correct (the formula is correct, as are the calculations and the integers representing light speed in km per sec & miles per sec, I used km to keep things metric in the workings for clarity. However my question is both a) is this working out of the joules contained in a 70kg human correct and b) what form of energy do those 89.6 billion joules take? I mean we're not going to get 89 billion joules of energy released from the hypothetical 70kg human if the body was to be used as the fuel for a fire for example are we? So does the 89 billion joules we get from the calculation actually represent the energy of each and every single atom that combines to form the 70kg human being, and as such, short of harnessing the inherent energy of every single one of said atoms the amount of joules we get by plugging into the formula the digits representing our hypothetical human being really just yields us an seemingly arbitrary quantity of joules, does it not?This is more of an extension of the original question with a written example of my workings to show how I reached the amount of joules contained in a 70kg human being. My apologies for writing this as an answer when it is so far from anything that could even be remotely considered an actual answer, however as the question has already being asked I thought I would add what I do know and expand the question to cover what I don't.Any feedback / guidance / answers would be greatly appreciated! So thanks in advance!!
How efficient is the human body at converting food energy into work energy?
Depending on what kind of energy, either 20% or 100%. First, technically, the human body doesn't convert matter into energy, it just extracts chemical energy from the food. The actual matter is either absorbed into the body (like proteins) or is discarded in the form of either moisture or waste. Studies on athletic motion suggest that the human body can turn about 20% of the food energy it absorbs into actual mechanical energy (like turning a generator or lifting objects). The rest goes into the normal energy of body processes, or is lost to inefficiency. The thing is, like any energy user, all of the energy that's lost ends up as waste heat. That means that, if you don't produce any other form of energy, then all the calories you burn end up as body heat. The answer to your second question, though is "no". The energy plot is one of the major plot holes in "The Matrix" (and has led to a lot of fan speculation). Even though all of the food we eat ends up as heat, converting that heat into electricity would create huge losses. I won't get into the thermodynamics of it, but it's pretty much impossible for the machines to get more than a few percent of that body heat converted into electricity. Moreover, feeding the dead to the living is an insanely self-limiting proposition. Each person would consume the equivalent of several human bodies every year. That means that you'd have to kill off three quarters of the population every year to keep the remaining one quarter alive, then kill off three quarters of the remaining population the next year, and you'd be out of people pretty fast. Any way you slice it, using humans as power generators is ridiculously inefficient. Apparently the Wachowski's originally had different ideas about why the machines would be farming humans, but the studio wanted them to change it because they thought the original ideas were too complicated.
How much energy can the human body generate?
I did some research on this and it turns out that we produce a lot of energy through sweat but extracting that is still a concept.Scientists have been working for a while now to try and generate power from our sweat and the latest tests have seen sweat power a radio for 2 whole days. Joseph Wang from the University of California, San Diego believes that sweat can power so much more than a radio, he says, “We’re now getting really impressive power levels. If you were out for a run, you would be able to power a mobile device.” Wow. Imagine having no battery left on your phone and being able to jog a little to get a bit of juice back.The power is generated using a small square skin patch. Only a couple of centimeters across and containing enzymes that replace the precious metals normally used in batteries, the patch feeds off the lactic acid in your sweat to provide the power output.Continue reading
1)Calculate the work done by a 47 N force pushing a pencil 0.26 m. DO NOT INCLUDE UNITS BUT KNOW THAT WORK IS?
Work = Force x Distance W = 47N x 0.26m = 12.22J
Suppose that a person eats a diet of 2388 Calories per day.?
There are 0.238902957619 calories in each each joule. This means 2388 calories equals 9995.7 joules. However, the calories consumed by a person is normally measured in kilocalories. So you need to multiply your answer by 1000.