![]() ![]() It merely means that the lights have received some heat energy from the surroundings and converted it into the output energy. The electrical power supplied to LED lights might be actually lower than the output, but it doesn't mean that energy was created in the process. How is it possible? The apparent efficiency of 300% results from the definition of efficiency that we use. Nevertheless, you will probably come across articles saying that LED lights or heat pumps can have an efficiency of 300% or more. Therefore, the efficiency of any machine can never exceed 100%. The fundamental law of energy conservation states that you cannot create energy. On the other hand, an efficiency of 100% means that there is no waste of energy whatsoever. E out E_\text E in – Energy input (also in joules).Īny efficiency calculated from real-world values will be between 0% and 100%.Īn efficiency of 0% means that all the input energy is wasted, and the energy output is equal to zero.η η η – Efficiency (expressed as a percentage),.The ton is currently only used in the United States and is equal to 2000 pounds (2000 lbs). The first one is used by all countries in the world and is defined to be equal to 1000 kg by the international body of standardization. When solving for the object's mass we output both tonne (metric ton) and ton (short ton). Of course, while using our calculator you would not need to perform these unit conversions, as they are handled for you on the fly. Finally we replace in the formula to get m = 2 Then we need to convert 800 km/h to m/s which is 222.22(2) m/s. What is the plane's mass? First we need to convert MJ to J: 2,100 500 / 0.5) = 44.7214 m/s or 146.7236 feet per second.Įxample 3: A plane is moving at a speed of 800 km/h and it has kinetic energy of 2100 MJ (MegaJoules).What is the velocity of the ball? First we convert 500 grams to 0.5 kg and then replace in the formula: v = √(2 (11.11) 2 / 2 = 135775.3 Joules or 135.7753 kiloJoules.Įxample 2: A ball which weighs 500 grams has a kinetic energy of 500 J.Using the first kinetic energy equation above, replace the values for m and v and get KE = 2200 What is the car's kinetic energy? To calculate the kinetic energy, first convert km/h to meters per second: 40km/h = 11.11 m/s. Kinetic energy calculation examplesĮxample 1: A car weighs 2200kg (2.2 tonnes) and is moving with a velocity of 40 km/h. This equation is used in coding this online kinetic energy calculator. If the object's speed is larger than a couple of percentages of the speed of light in vacuum it is a poor approximation according to relativistic mechanics. This formula is valid in classical mechanics and for non-rotating rigid point objects (the object's mass is assumed to exist at a single point). Whereas the second and third ones are the transformed equations for solving for mass or velocity. ![]() The formula for kinetic energy ( KE) expressed in terms of the body's velocity (speed) ( v) and its mass ( m) is the first equation below: When the output of the tool is mass or velocity it is in both standard metric units and imperial ones, with the units automatically being adjusted depending on how big or small the resulting value is. ![]() The output of the tool if calculating for kinetic energy is in Joules (J, kJ, MJ), Watt-hours (Wh, kWh), calories (Cal, kCal) and foot-pounds (ft-lbs). When solving for mass you need to know velocity and kinetic energy, while when solving for velocity you need to know the object's mass and kinetic energy. The respective input fields will be hidden or displayed upon selecting what you want to use the calculator for. The KE calculator can also be used to solve for any of the other values: mass and velocity. Its acceleration does not matter since the energy is calculated at a particular moment of time. To calculate the kinetic energy you need to know only the body's mass and velocity. It can also be used to calculate the energy of different kinds of projectiles. For example, it can be used to calculate the kinetic energy of a person, vehicle (car, truck, train), plane, football, as well as for falling bodies that crash into the ground. This kinetic energy calculator is useful for estimating the energy a body acquires through movement of any kind. ![]()
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