An amateur blacksmith wants to cool off a 42kg glowing piece of iron, specific heat 470and decides to toss it into a 5.0 kg iron bucket with 10.0 kg of room temperature(23 C) water in it. To his surprise the water completely evaporates away (meaning once it vaporizes it is no longer part of the system) and after some time he goes to pick up the bucket but finds that the bucket is at 150 C. Required:
What was the initial temperature of the glowing piece of iron?

The right approach is "1479°C".

Explanation:

The given values are:

Mass of iron piece,

Mass of iron bucket,

Mass of water,

Iron's specific heat,

Water's specific heat,

Initial temperature,

Final equilibrium temperature,

Latent heat,

As we know,

The heat lost by the glowing piece of iron will be equal to the heat gain by the iron bucket as well as water, then

⇒

On substituting the given values, we get

⇒

⇒

⇒          

⇒          

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table