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Power – problems and solutions. Power is the rate at which work is done in a given period. Mathematically, power is the work/time ratio. P = W/t. Description: P = power (Joule/second = Watt), W = work (Joule), t = time interval (second) Based on this equation, it can be concluded that the greater the work rate, the greater the power.
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1. _________________________________ is the rate at which work is done. 2. When calculating power, you should use the formula P = _________________ divided by _____________. In this formula, “P” stands for power, ____ stands for work, and _____ for time. 3.
When deciding which of these two approaches to use to solve a problem, try using energy conservation first. Kangaroos are mentioned at the beginning of this chapter.
Power can be expressed in units of watts (W). This unit can be used to measure power related to any form of energy or work. You have most likely heard the term used in relation to electrical devices, especially light bulbs. Multiplying power by time gives the amount of energy.
AP Physics 1- Work, Energy, & Power Practice Problems ANSWERS FACT: The amount of work done by a steady force is the amount of force multiplied by the distance an object moves parallel to that force: W = F x cos (θ). The units are N. m, which equal a Joule (J). Positive work is done by a force parallel to an object’s displacement.
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problems in physics: **Energy is ALWAYS conserved** Kinetic energy K is energy associated with the state of motion of an object. The faster an object moves, the greater its kinetic energy. Potential energy U represents stored energy, e.g., in a spring. It can be released later as kinetic energy.
Problems: Work, Energy, Power 1) A 10.0 kg mass sliding on a frictionless horizontal surface at 7.00 m/s hits a spring that is attached to a wall. The spring has a spring constant of 5000 N/m. a) Determine the maximum compression of the spring. At maximum compression, the box has a speed of zero.
