how do you work out energy in physics?
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The formula for the energy of motion is KE = . 5 × m × v2 where KE is kinetic energy in joules, m is mass in kilograms and v is velocity in meters per second.
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Determine mass with force and acceleration. If you know the net force on the object, and it's acceleration, you can rearrange this formula to find the mass: m = F / a. Force is measured in N (newton), which you can also write as (kg * m)/ s2. Acceleration is measured in m/s2.
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['Heat of fusion is the amount of energy in the form of heat needed to change the state of matter from a solid to a liquid (melting.)', 'The formula to calculate heat of fusion is: q = m·ΔHf']
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Divide the amount of heat energy provided to the substance, in joules, by the mass of the substance, in grams (g). For example, if 4,000 joules of energy were provided to 500 g of water, you would calculate 4,000/500 = 8. Divide the result of the previous calculation by the specific heat capacity of the substance.
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Both enthalpy and energy are measured in joules, which already suggests that they are about the same thing. Formally there is a difference, as the formula for enthalpy (H) is: H = E + PV, where E=energy, P=pressure and V=volume.
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Multiply the change in temperature by the specific heat capacity and the mass of your object. This will give you the heat lost or gained in joules. Example: If 10 kilograms of water are heated from 10 degrees Celsius to 50 degrees Celsius, how much energy (in joules) did they absorb?
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Based on Einstein's equation E = mc^2, the amount of energy added is relative to the mass gained by the proton multiplied by the speed of light squared. In other words, a lot of energy is converted into a relatively small amount of mass.
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Expression for K.E - KINETIC ENERGY-K.E = 1/2 mv2. "Energy posses by a body by virtue of its motion is referred to as 'Kinetic Energy'". Kinetic energy depends upon the mass and velocity of body. If velocity is zero then K.E. of body will also be zero.
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The total energy is the sum of the electron's kinetic energy and the potential energy coming from the electron-proton interaction. The kinetic energy is given by KE = 1/2 mv2. This can be found by analyzing the force on the electron.
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["add together the bond energies for all the bonds in the reactants - this is the 'energy in'", "add together the bond energies for all the bonds in the products - this is the 'energy out'", 'energy change = energy in - energy out.']
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['Amount of energy released or absorbed is calculated. q = m × Cg × ΔT. q = amount of energy released or absorbed. ... ', 'calculate moles of solute. n = m ÷ M. ... ', 'Amount of energy (heat) released or absorbed per mole of solute is calculated. ΔHsoln = q ÷ n.']
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The potential energy or energy required to lift the object E=mgh. Unit of energy is Joules (J) or Kg m^2 /s^2. Therefore the energy required to lift the object of mass 1kg to the height 1 m is 9.8 Jules.
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The principle of work and kinetic energy (also known as the work-energy theorem) states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle.
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Work = Mass * Gravity * Height and is measured in Joules. Imagine you find a 2 -Kg book on the floor and lift it 0.75 meters and put it on a table. Remember, that “force” is simply a push or a pull. If you lift 100 kg of mass 1-meter, you will have done 980 Joules of work.
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Newton meter is the answer to this. A newton meter is not a unit of energy, rather, it is a unit that can be found in the SI system.
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2 Answers. Where U is potential energy, m is mass in kilograms, g is the acceleration due to gravity g=(9.81m/s2), and h is height is meters. Your equation h=E/mg is simply this formula rearranged to solve for height. All you need to do is plug in your values and solve for height.
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Originally Answered: What is the relation between mass and energy? Einstein's theory of special relativity (1905) shows that matter (as mass) and energy can be converted into each other according to the famous equation E = m c*c where E is energy, m is mass, and c is the speed of light.