Thermodynamics Test 1

A perfectly insulated thermos bottle contains hot coffee and is sealed tightly so that neither heat nor mass crosses the boundary. What type of thermodynamic system does the thermos most clearly represent?

Isolated System

During the final lap of a championship race in Mario Kart, Princess Peach activates a hyper speed mushroom boost and reaches a velocity of 0.0950 km/s. What is her speed in miles per hour (mph)?

213 mph: (.095 km/s)(1 mi/1.6093 km)(3600s/1hr)

The SI unit for temperature

Kelvin

Specific Volume

V= v/m

Atmospheric Pressure of a Barometer

Patm= pgh

Gauge Pressure of Manometer

P = Patm + pgh, Pgauge = Pgh→ Pgage = P - Patm

Steam flows through a turbine in a power plant. As the steam passes through the turbine, it causes the turbine blades to spin and produces electricity. The steam exits the turbine at a lower energy state than when it entered. According to the First Law of Thermodynamics, what happened to the energy of the steam?

The energy was converted into work output by the turbine.

A gas is contained inside a frictionless piston-cylinder device. During one process, the gas expands and pushes the piston outward. During another process, the surroundings compress the gas by pushing the piston inward. Which statement correctly describes the sign and direction of work for these processes?

During expansion, work is done by the gas; during compression, work is done on the gas.

Which of the following forms of energy does NOT fall under the microscopic forms of energy of a thermodynamic system?

Potential energy

A steak is placed on a hot grill and cooks as energy is transferred from the grill to the steak. If the steak is considered the system, which statement correctly describes the heat transfer?

Heat transfer is positive because thermal energy flows into the steak from the hotter grill.

A person touches the handle of a metal pan that has been sitting on a hot stove. After a few seconds, the handle becomes hot. What is the primary mode of heat transfer occurring in this process?

Conduction

A rigid tank contains a saturated liquid-vapor mixture of water with a quality of x = 0.25. Which statement is correct?

Twenty-five percent of the mass of the water is vapor

On a hot, humid morning, water vapor in the air forms liquid droplets on the outside of a glass of ice water. Which phase change is occurring?

Condensation