Homework Help: physics- please check

Posted by Anonymous on Sunday, February 4, 2007 at 6:24pm.

a. Two sticks are rubbed together to start a fire.
b. A firecracker explodes.
c. A red-hot iron bar is set aside to cool.

In which of the situations listed above is energy being transferred as heat to the system in order for the system to do work?
I would say A & B.

In which situation is work being done on the system in order for energy to be transferred from the system as heat?
I would say C.

Nuts. One has to define the system.

No one has answered this question yet.

Answer this Question

Related Questions

Physics - In which of the situations listed below is energy being transferred as...
physics - In which of the situations listed below is energy being transferred as...
physics.......please help!!! - In which of the situations listed below is energy...
Chemistry 22 - which illustrates in an increase in potential energy? a. a ...
Physics - a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If ...
Physics - a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If ...
Physics - A bar of aluminum (bar A) is in thermal contact with a bar of iron (...
science - A 30-g iron bar at 100degreeC is placed in 200 g of water at 20degreeC...
Physics - A uniform bar of iron is supported by a lon, uniform Hooke's Law ...
SCIENCE GRADE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! - If you had a piece of ...

For Further Reading

First Name:
School Subject:
Answer: