How do we measure efficiency?
You start by measuring the expected (theoretical) output in terms of Energy which you calculate mathematically , then you measure the actual energy output ,then you divide the actual by the expected (theoretical), express this in a percentage and you now have your efficiency .
What is the volumetric efficiency of an IC engine?
Volumetric efficiency (in simple terms) is how much air gets filled in the engine. To explain this, consider an engine with a displacement of say 600cc. Now during the intake stroke, air is filled in because the intake valve is opened. Theoretically air of 600cc must fill the combustion chamber. This would make the engine 100% efficient in terms of volume i.e. volumetric efficiency of 100%. But there are some limitations like intake manifold, valve timings, etc; which provide a passage to air into engine. But due to design constraints, air of say 500cc enters the engine. This makes the volumetric efficiency of 83.3%.By formula:Volumetric efficiency=(Air entering engine÷Engine displacement)X100In short it displays, the percentage volume of air entering the combustion chamber.Note: Volumetric efficiency can be increased also above 100% by using a turbocharger.
What is the formula for mechanical efficiency? What are the different cases in which in can be used?
Formula for mechanical efficiencyIt is calculated in percentage to see how efficient or useful your input is !! For instance if you want to find how efficient a machine is, you have to calculate the mechanical efficiency by dividing the Output obtained by the machine and the input given. Usually Mechanical efficiency is calculated for almost all mechanical equipment before its been brought to work. If a machine is less efficient, then there is no point its being employed to do a work.For more knowledge visit on mechanicalworld
What is mechanical efficiency?
Efficiency generally means how much useful output you're producing, compared to what you're putting in. Mechanical efficiency is obtained by measuring the power available from a mechanical device, such as a gear reduction, divided by the power delivered to it. The lost energy goes into heat, noise and vibration. The best you can expect from a simple gear system might be 99%.Other kinds of efficiency are determined when converting energy from one form to another, one example being an electric motor. A motor's overall efficiency is found by comparing the mechanical power it produces to the electrical power it consumes.The efficiency of a combustion engine is found by comparing the mechanical power produced, to the chemical energy in the fuel consumed. The result depends on a combination of both thermal and mechanical efficiency. It's also an infinitely complex problem, which industry has been working on quite intensely for around 150 years.
How many calories are burned by 50 squats?
To calculate the amount of calories you burn while doing squats without additional weights, multiply your weight by .096.Take the answer and multiply it by the amount of minutes you perform the exercise.
Why can I lift my bodyweight with weights (e.g., deadlift, bench press, and squat), but cannot lift my bodyweight while doing dips or pull-ups?
Because with squats, bench, and deadlifts, you preload the pressure to your legs and generate force with your feet on the floors so you can use hip drive and/or leg drive. Also deadlift starts off as a leg press, so it’s first a leg exercise before it is a back exercise.When it comes to dips and pull ups, or any bodyweight exercises, you can’t generate force with your feet while it’s off the ground. Instead you have to activate your entire body, the more muscles you can recruit throughout your entire body, the better and if possible try to keep your head/face relaxed though. What that does is called “preventing energy leak”, and also, you generate force from your hands because it is the only option as it’s the only thing touching something.Then it comes down to putting in effort to learning. Just like ALL and ANY exercise, it uses different muscles, has its own learning curve, its own set of cues, and some cues can be used for other exercises too. Such as bending the bar and using your hands as if they’re hooks. Start learning from the beginning by hanging on the bar, learning to engage your entire body, and how to retract your scapulas.
How many horsepower do humans have?
Short answer: more than 1 hp for sure, depends on body type and training level though.Slightly longer answer:Horsepower is an imperial measurement which you'd first have to convert to metric units. In metric units, 1 hp is equivalent to the ability of raising 75 kilograms one meter against earth's gravity in 1 second. so: 1hp = 75kg-m/s.How much is 75kg?Well, the average US human female is about 75kg. Shocking fact: the average human biomass (male and female combined) for the world population overall is about 62kg (source: http://bmcpublichealth.biomedcen...).So, the question "How many horsepower do humans have?" is convertible into: "Can a human lift an American female 1 meter up in the air in 1 second?"I think there are a lot people capable of doing exactly that if not even more.Here is a video of Dmitry Klokov in 2013: Here he performs a 215kg clean. A clean is a very explosive Olympic lift where you try to throw and catch a barbell from ground to shoulder. The first parts of the lift is the lift of the ground, explode it up and catch the weight with your shoulders by throwing yourself underneath the barbell. The bottom position is roughly 1 meter high and he does it very quickly, somewhat around 1 second.So, in this case, we have an example of a human being – with a specific physique obviously – that produces 215 over 75 equals 2.87 hp. Almost 3 hp!There are multiple examples of humans producing more than 1hp output of force if you know that 1 hp is similar to 75kg-m/s