Question

For each of the following processes, choose whether the sign of net energy transfer is positive or negative with respect to the

underlined system.
Items (3 items) (Drag and drop into the appropriate area below)
Categories
Positive
The gas inside a hot air balloon
as it is inflated using a propane
burner
An ice cube in your hand
A brick being lifted from the
ground to the top of a wall
No more items
Negative
Drag and drop here.
Not enough information
Drag and drop here

Answer 1

The sign of net energy transfer depends on whether energy is being gained or lost by the system.

Step-by-step explanation:

The sign of net energy transfer depends on whether energy is being gained or lost by the system. In the case of the gas inside a hot air balloon as it is inflated using a propane burner, the energy transfer is positive because heat is being added to the gas to increase its temperature and volume. For an ice cube in your hand, the energy transfer is negative because heat is being transferred from the warmer hand to the cooler ice cube, causing it to melt. Finally, in the case of a brick being lifted from the ground to the top of a wall, the energy transfer is positive because work is being done on the brick to increase its gravitational potential energy.

Learn more about energy transfer