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ehy can't a machine be 100% efficient?

13 years ago

a kettle turns 1000j electric energy into 350j of heated water. what is its efficiency? where is the other energy 'wasted' to?

13 years ago

a hairdryer turns 250J of electrical energy into 50J of heated air. how efficient is this machine and how much is wasted to sound?

13 years ago

what is the efficiency equation?

13 years ago

what is mantle dynamics?

13 years ago

prove that 2 2 2 2 (n-1) + n + (n+1) = 3n +2

13 years ago

prove that (n-1) squared + n + (n+1)squared = 3n +2

13 years ago

which of the following are non- polluting: renewable sources coal nuclear fuels or oil?

13 years ago

what is the quadratic equation?

13 years ago

find two even integers(numbers) so that the square of the smaller is 10 more than the larger one

13 years ago

the length of a rectangle is twice its width, the area is 72sq inches,find its dimensions(find length and width)

13 years ago

4x-15/2=1/2 2*1/2=1 4x-15=1 4x=1+15 4x= 16 x= 16/4 x= 4

13 years ago

for energy

13 years ago