How long does it take the Sun to melt a block of ice

In summary, the conversation discusses the time it would take for the Sun to melt a block of ice with certain specifications. The relevant equation for this problem is given and the poster is seeking help in manipulating it to find the time.
  • #1
itryphysics
114
0

Homework Statement


How long does it take the Sun to melt a block of ice at 0 celcius with a flat horizontal area 1.0 m^2 and thickness 1.0 cm ? Assume that the Sun's rays make an angle of 30 with the vertical and that the emissivity of ice is 0.050.



Homework Equations



delta [Q] / delta [t] = (1000W/m^2)(emissivity)A(cos theta)


The Attempt at a Solution



delta [Q] / delta [t] = 1000(.05)(cos30)

I know that this does not give me time. I don't know how to manipulate this equation..please help . Thanks!
 
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  • #2


What should ΔQ be, in order to melt a block of ice of the given volume?
 

1. How long does it take the Sun to melt a block of ice?

The time it takes for the Sun to melt a block of ice depends on many factors, such as the size of the block, the temperature of the ice, and the intensity of the sun's rays. On average, it can take between 30 minutes to 2 hours for the Sun to melt a small block of ice.

2. Can the Sun melt a block of ice instantly?

No, the Sun cannot melt a block of ice instantly. It takes time for the sun's heat to transfer to the ice and cause it to melt. However, the larger and more intense the sun's rays, the faster the ice will melt.

3. Can the Sun melt a block of ice in freezing temperatures?

Yes, the Sun can still melt a block of ice in freezing temperatures. Although the surrounding air may be below freezing, the sun's rays can still provide enough heat to cause the ice to melt. This is why you may see icicles melting on a sunny winter day.

4. How does the Sun's heat melt ice?

The Sun's heat melts ice by transferring thermal energy to the ice. When the sun's rays hit the ice, the energy is absorbed by the molecules in the ice, causing them to vibrate and break apart the crystal structure of the ice. This results in the ice turning into liquid water.

5. Does the angle of the Sun affect how long it takes to melt ice?

Yes, the angle of the Sun can affect how long it takes to melt ice. When the Sun's rays are more direct, such as during the summer months, the ice will melt faster. However, when the Sun's rays are at a lower angle, such as during the winter months, the ice will take longer to melt as the rays are more spread out and less intense.

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