*I thank Stephen Selipsky for bringing Page's results to my attention and for his patient explanations. Here are the step-by-step calculations to work out the Standard Deviation (see below for formulas). As the universe expands and cools, however, eventually the black hole may begin to lose mass-energy through Hawking radiation. The Work Calculator Physics is an online tool that uses the product of the two inputs, force and distance (in metric units), to find the value of the work done. Indeed, any black hole with a mass greater than about 0.75% of the Earth's mass is colder than the cosmic background, and thus its mass increases for now. W F×d×cos () Where W is work, F is the force applied to the object, is the angle between the directions of force application and object displacement, and d is the displacement. So rather than shrinking, it would continue to grow. Therefore, whatever little energy it radiates, it actually receives more in the form of heat from the cosmos. But that does not take into account the fact that such a black hole is colder than the cosmic microwave background radiation bathing it. The lifetime of a $1~M_\odot$ black hole, therefore, is calculated as nearly 57 orders of magnitude longer than the present age of the universe. The latest version also correctly accounts for the black hole's effective area, light scattering, and the resulting change in its evaporation lifetime. The drop-down menus select the units of measure to be used for their corresponding input field.Īn added feature is the calculation of the "peak photon" wavelength, corresponding frequency, and photon energy, representing the peak of the blackbody radiation curve per unit logarithm (of wavelength or frequency) that corresponds to the black hole temperature.
I kept the unit, but decided to use instead the much more useful value of one solar mass as the initial mass.Īs in Wisniewski's version, specifying any quantity causes the others to be recalculated accordingly (see source).
#Work done physics calculator code#
Wisniewski's original code included a fictitious unit of mass, the "standard industrial neuble", equivalent to a billion metric tons, from Will McCarthy's novel The Collapsium. The original idea belongs to Jim Wisniewski, whose page from 2006 ( link) appears to be no longer available available again, but since it is not archived by the Wayback Machine, I think my functional clone is still useful. In the more general cases where everything varies, one often calculates the work first and then divides by the time to get the average power.This page contains a JavaScript calculator of Hawking radiation and other parameters of a Schwarzschild black hole. Then for instantaneous power, you just multiply the product of force and velocity by the cosine of the angle between them to get the power. This calculation is only for cases where the force is in the direction of the velocity, and there are many cases where that is not so. It can calculate current, voltage, resistance, work. A horsepower is equal to 550 ft lb/s, and a kilowatt is 1000 watts. This online calculator can help you solve the problems on work done by the current and electric power. The procedure to use the work calculator is as follows: Enter the force.
#Work done physics calculator free#
The rate of doing work is equal to the rate of using energy since the a force transfers one unit of energy when it does one unit of work. Work Calculator is a free online tool that displays the work done by the object. The standard unit for power is the watt (abbreviated W) which is a joule per second. In the given question part (a) I dont understand why the work done is negative The answer says that the displacement is along positive x direction (i understand that) while force acting on the particle is along negative x direction ( why is that since it appears that as the value of x is increasing so is the value of force. In a more general case where the velocity is not in the same direction as the force, then the scalar product of force and velocity must be used. It doesn’t matter, whether you need to do the calculations for acceleration of car, friction force of walking, energy required to do specific work or force of attraction between the charges etc. In the straightforward cases where a constant force moves an object at constant velocity, the power is just P = Fv. Physics plays a crucial role in our daily life. Often it is convenient to calculate the average power. These two definitions are equivalent since one unit of energy must be used to do one unit of work.
Power PowerPower may be defined as the rate of doing work or the rate of using energy.
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