For two objects to be in thermal equilibrium they must A. be in contact with each other. B. radiate equal amounts of power. C. have the same thermal capacity. D. be at the same temperature.

A piece of iron is placed in a kiln until it reaches the temperature θ of the kiln. The iron is then quickly transferred to water held in a thermally insulated container. The water is stirred until it reaches a steady temperature. The following data are available.

Thermal capacity of the piece of iron = 60 J K–1 Thermal capacity of the water = 2.0 × 103 J K–1 Initial temperature of the water = 16 °C Final temperature of the water = 45 °C

The thermal capacity of the container and insulation is negligible. Calculate the increase in internal energy of the water as the iron cools in the water.

What is the mass of carbon-12 that contains the same number of atoms as 14 g of silicon-28? A. 6 g B. 12 g C. 14 g D. 24 g

A piece of iron is placed in a kiln until it reaches the temperature θ of the kiln. The iron is then quickly transferred to water held in a thermally insulated container. The water is stirred until it reaches a steady temperature. The following data are available.

Thermal capacity of the piece of iron = 60 J K–1 Thermal capacity of the water = 2.0 × 103 J K–1 Initial temperature of the water = 16 °C Final temperature of the water = 45 °C

The thermal capacity of the container and insulation is negligible. Calculate the temperature θ of the kiln.

The internal volume of a gas cylinder is 2.0 × 10–2 m3. An ideal gas is pumped into the cylinder until the pressure becomes 20 MPa at a temperature of 17°C. Determine the number of gas atoms in the cylinder.

Two different objects are in thermal contact with one another. The objects are at different temperatures. The temperatures of the two objects determine A. the process by which thermal energy is transferred. B. the heat capacity of each object. C. the direction of transfer of thermal energy between the objects. D. the amount of internal energy in each object.

The specific latent heat of vaporization of a substance is greater than its specific latent heat of fusion because A. boiling takes place at a higher temperature than melting. B. thermal energy is required to raise the temperature from the melting point to the boiling point. C. the volume of the substance decreases on freezing but increases when boiling. D. the increase in potential energy of the molecules is greater on boiling than on melting.

The graph shows a pressure-volume (P–V) relationship for a fixed mass of an ideal gas. The gas undergoes a three-stage cycle AB, BC and CA. Use data from the graph to show that the change AB is isothermal.

The graph shows a pressure-volume (P–V) relationship for a fixed mass of an ideal gas. The gas undergoes a three-stage cycle AB, BC and CA.

Calculate the work done by the gas in the change BC.

Which of the following is equivalent to the principle of energy conservation? A. Newton’s first law B. The first law of thermodynamics C. Newton’s second law D. The second law of thermodynamics