Answer:
It will take 58 seconds
Step-by-step explanation:
If you have 1 kg of water in the jar, half of it will be 0.5 kg.
To vaporize half of the water (0.500 kg) the energy supply needed is

If the stove is supplying 20 kJ/s, the time its needed is

It will last at least 58 seconds to vaporize half of the water.
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Answer:
1,200
Step-by-step explanation:
Divide 800 by 40
Then take that answer which is 20 and multiply it by 60
Then you get 1,200
Answer:
114 3/4
Step-by-step explanation:
Convert decimal to fraction.
114.75 = 11475/100
Then simplify it. 459/4 = 114 3/4
Pretty sure the answer is D, if you simplify it, you will have 1/5