o Kinetic Energy and Gravitat Question 2 In this case, the kinetic energy (of th

Question

o Kinetic Energy and Gravitat Question 2 In this case, the kinetic energy (of the air) and the thermal energy are both useful. energy are both useful. How efficient is the hair dryer? The Sankey diagram below is for a hair dryer. the kinetic give your answer as a percentage 25 Kimetic energy Electrical 600 3 energy 325 1 50 J Thermal energy Sound energy estion 3 mass is fireda mass that is initially at rest. The projectile becomes embedded (stuck) in the hanging target. The combined target and projectile move back and up, re which the speed of this object is temporarily zero). This height is measured by a camera that records the event. This method is shown in the diagram

Explanation / Answer

Given the input energy = 600 J.
The useful energy given by the hair dryer as output is sum of kinetic energy of air and thermal energy.
output useful energy = 325 + 225 = 550 J.
efficiency = output energy /input energy = 550/600 = 0.9167
So efficiency of the hair dryer is 91.67 percent.

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