Posted by **Akitsuke** on Sunday, December 14, 2008 at 7:15am.

1. How much ice at -10 degrees Celsius is required to cool a mixture of 0.1 kg ethyl alcohol and 0.1 kg water from 20 degrees Celsius to 0 degrees Celsius?

2. Find the heat produced by 1 KW heating element in one hour.

3. A 3g lead bullet at 30 degrees Celsius is fired at a speed of 240 m/s into a large block of ice at 0 degrees Celsius in which it becomes embedded. What quantity of ice melt?

thanks. :)

- PHYSICS 102E -
**drwls**, Sunday, December 14, 2008 at 7:52am
1. Write an energy balance equation: Heat absorbed by heating (from -10) and melting X g of ice equals heat removed from the liquid water and alcohol as they is lowered to 0 C. Solve for the amount of melting ice, X

2. Watts is Joules per seond. Multiply 1000 W by the number of seconds

3. First compute the number of Joules of kinetic energy in the bullet. It will equal the heat available to melt, Q. Assume a final equilibrium of 0 C and write an equation saying that much Q lowers the temp of the lead to 0 C while melting X g of ice. X will be the only unknown in that equation. Solve for it.

- PHYSICS 102E -
**Akitsuke**, Sunday, December 14, 2008 at 8:14am
thanks. :)

## Answer This Question

## Related Questions

- Physics 20 - 1. How much heat energy is required to change 500 grams of water at...
- Physics - Please Help! I am having difficulties grasping these concepts. Explain...
- Physics - The water from two buckets is mixed together. One bucket contains 5kg ...
- Organic Chemistry - I have already calculated the volume of ethyl alcohol need ...
- Chemistry - Calculate the joules of energy involved when 11 grams of water at 10...
- Physics - How much heat must be added to 1-kg of 0 degrees Celsius water to turn...
- Chemistry - 20.7mL of ethanol (density=0.789g/mL) initially at 8.2 degrees ...
- PHYSICS 102E - (0.2kg)(4190J/kg.degree Celsius)(T-70 degrees Celsius)+(0.1kg)(...
- physics - How much ice at zero degrees celsius is needed to cool 250g of water ...
- chemistry - Calculate the enthalpy change for converting 10.0g of ice at -25 ...

More Related Questions