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Elina [12.6K]
3 years ago
13

A 12 cm radius air duct is used to replenish the air of a room 9.2 m x 5.5 m x 4.5 m every 10 min. how fast does the air flow in

the duct?
Physics
1 answer:
mote1985 [20]3 years ago
6 0
In this problem, given the dimensionns of the room and the dimension of the pipe in which air passes through, we can determine the flow of air in the duct. The area of the duct is A = pi r2 where r is equal to 12 cm. we divide this area to time which is 10 minutes, then we get the answer.
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Answer:

about 1.5 bars

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Explanation:

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Glottis I believe is the answer.

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A well lagged copper calorimeter of mas 120g contains 70g of water and 10g ice both at 0°C . Dry steam at 100°C is passed in unt
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Answer:

7.6 g

Explanation:

"Well lagged" means insulated, so there's no heat transfer between the calorimeter and the surroundings.

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q = mCΔT

q = (120 g) (0.40 J/g/K) (40°C − 0°C)

q = 1920 J

Heat gained by the water:

q = mCΔT

q = (70 g) (4.2 J/g/K) (40°C − 0°C)

q = 11760 J

Heat gained by the ice:

q = mL + mCΔT

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q = 4880 J

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q = mL + mCΔT

q = m (2200 J/g) + m (4.2 J/g/K) (100°C − 40°C)

q = 2452 J/g m

Plugging the values into the equation:

1920 J + 11760 J + 4880 J = 2452 J/g m

18560 J = 2452 J/g m

m = 7.6 g

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