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vladimir2022 [97]
3 years ago
13

A tank of water is separated into two sections. Hot green water is placed on one side of the tank and clear cold water is placed

on the other side. What would you predict will happen when the partition separating the tank is removed? Why?
Physics
2 answers:
storchak [24]3 years ago
4 0

As soon as the partition is removed, the immediate first reaction is that the clear cold water all sinks to the bottom, and the warm green water all collects on top.  So at the beginning, you get a green layer sitting on top of a clear layer, with a sharp, distinct line between them.

As time goes on, heat starts to move from the warm water to the cool water.  It happens right at the place in the middle where they meet, so it doesn't go along very fast.  Little by little, some heat conducts out of some warm green water and into some cool clear water.  

After a long time, all the water in the tank becomes the same temperature.  It's all light green, and the convection (flowing up and down) stops.

Oksanka [162]3 years ago
3 0
The water would become room temperature. I predict this because the cold water would cool down the hot water a lot. This, of course, depends on the exact temperature of the waters.
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Answer:

10.52 m

Explanation:

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P = σεAT⁴ where ε = emissivity = 0.97, T = temperature = 30 C + 273 = 303 K, A = surface area of human body = 1.8 m², σ = 5.67 × 10⁻⁴ W/m²K⁴

P = σεAT⁴ = 5.67 × 10⁻⁸ W/m²K⁴ ×  0.97 × 1.8 m² × (303)⁴ = 834.45 W

This is the power radiated by the human body.

The intensity I = P/A where A = 4πr² where r = distance from human body.

I = P/4πr²

r = (√P/πI)/2

If the python is able to detect an intensity of 0.60 W/m², with a power of 834.45 W emitted by the human body, the maximum distance r, is thus

r = (√P/πI)/2 = (√834.45/0.60π)/2 = 21.04/2 = 10.52 m

So, the maximum distance at which a python could detect your presence is 10.52 m.

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3 years ago
Which of the following body systems work together to get sells the oxygen they need to carry at the cellular respiration
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10. Someone takes 11 minutes to walk up a hill 120m high. His weight is 550N.
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A typical male sprinter can maintain his maximum acceleration for 2.0 s, and his maximum speed is 10 m/s. After he reaches this
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Suppose a 48-N sled is resting on packed snow. The coefficient of kinetic friction is 0.10. If a person weighing 660 N sits on t
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Assume the snow is uniform, and horizontal.

Given:

coefficient of kinetic friction = 0.10 = muK

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normal force on of sled with rider = 48+660 N = 708 N = N

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=70.8 N


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8 0
3 years ago
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