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3 Cards in this Set
- Front
- Back
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Give 3 examples of (1)Forms of energy(2)Energy transformation. |
(1)Mechanical energy,heat energy,sound energy.(2)chemical-mechanical (moving car),Sound-electrical-sound (telephone),Electrical-mechanical (Rotating fan). |
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Prove that K.E=1/2MV^2 |
If a moving car is brought to rest by a constant retarding force f.then Work done in stopping the car=f×s,where s=((u+v))/2,as v=0 then s=ut/2.F=ma,a=(v-u)/t..a is retardation a=u/t,f=m(u/t)...as w=f×s=mu/t ×ut/2=mu^2/2. |
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What is power?and give its unit |
Power is the rate of doing work/rate of energy transfer.Its formulae w/t.unit is joule per second...watts..1horsepower=746watts |
