Physics: Chapter 9 Heat

If two small beakers of water, one at 70C and one at 80C, are emptied into a large beaker, what is the final temperature of the water?

• The final temperature is less than 70C.

• The final temperature is greater than 80C.

• The final temperature is between 70C and 80C.

• The water temperature will fluctuate.

Energy transferred as heat occurs between two bodies in thermal contact when they differ in which of the following properties?

• mass

• specific heat

• temperature

• density

Energy transfer as heat between two objects depends on which of the following?

• The difference in mass of the two objects.

• The difference in volume of the two objects.

• The difference in temperature of the two objects.

• The difference in composition of the two objects.

A nail is driven into a board with an initial kinetic energy of 150 J. If the potential energy before and after the event is the same, what is the change in the internal energy of the board and nail?

• 150 J

• 75 J

• 0 J

• -150 J

Which of the following is a form of kinetic energy that occurs within a molecule when the bonds are stretched or bent?

• translational

• rotational

• vibrational

• internal

As the temperature of a substance increases, its volume tends to increase due to

• thermal expansion

• thermal equlibrium

• thermal expansion

• thermal contraction

A substance registers a temperature change from 20C to 40C. To what incremental temperature change does this correspond?

• 20 K

• 40 K

• 36 K

• 313 K

Energy transferred as heat occurs between two bodies in thermal contact when they differ in which of the following properties?

• mass

• specific heat

• density

• temperature

The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through what process?

• conduction

• radiation

• convection

• vaporization

Why does sandpaper get hot when it is rubbed against rusty metal?

• Energy is transferred from the sandpaper into the metal.

• Energy is transferred from the metal to the sandpaper.

• Friction between the sandpaper and metal increases the temperature of both.

• Energy is transferred from a hand to the sandpaper.