Using a string, you pull a box along a low-friction table with a constant force of 100 N, starting from rest. The box is full of fluid and is a cube of dimensions 1m x 1m x 1m with a total mass of 2.0 kg. When the box was at rest, the center of mass of the system was located at relative to the left, lower corner of the box. At some time later, your hand has pulled through a distance of 0.5 m, and the center of mass has shifted to relative to the left, lower corner of the box.
A box with fluid being pulled by a constant force.
The box is thermally insulated and the table is nearly frictionless, so assume that there is no energy transferred thermally between the box and its surroundings.
- Define the box and fluid to be the system. What is of the system?
- What is of the system?
- What is the speed of the system (after your hand has moved through a distance of 0.5 m)?
- What is the change in the thermal energy of the system?