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Gemiola [76]
3 years ago
14

What is the most likely evidence of an energy transformation taking place when a skater glides over ice? A.Skating blades become

cold as kinetic energy is transformed into thermal energy B.Skating blades become cold as kinetic energy is transformed into gravitational energy C.Small tracks of water are left on the ice as kinetic energy is transformed into thermal energy D.Small tracks of water are left on the ice as kinetic energy is transformed into gravitational energy
Chemistry
1 answer:
Diano4ka-milaya [45]3 years ago
7 0
The correct answer is C. The weight downward and the friction moving forward creates thermal energy through kinetics and melts a tiny bit of the ice making it slick enough for the skate to slide.
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3 years ago
The dilution factor D for an unseeded mixture of wastewater is 0.05. The DO of the mixture is initially 8.0 mg/L, and after 5 da
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Answer:

(i) 5-day BOD of the waste is 120 mg/l.

(ii) The ultimate carbonaceous BOD (Lo) is 20 mg/l.

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The dilution factor D is 0.05.

The initial DO is 8.0 mg/L and the DO after 5 days is 2.0 mg/L.

The BOD of the waste for an unseeded mixture is

BOD_5=(DO_5-DO_0)/D=(8-2)/0.05=6/0.05=120mg/l

The ultimate carbonaceous BOD (Lo) can be calculated as

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