hw set 2 questions

A barometer measures 760 mmHg at street level and 735 mmHg on top of a building. How tall is the building if we assume air density to be 1.15 kg/m3, density of mercury to be 13500 kg/m3, and acceleration due to gravity to be 9.81 m/s2?

(760-735)(9.81)()= 295m

Convert 98°F to °C. Multiple choice question. 36.67 557.89 208 32 20

(98-32) * 5/9 = 36.67

At a location where the atmospheric pressure is equal to 100 kPa, a tire's gage pressure reading is 200 kPa. What is its corresponding absolute pressure?

100 + 200 = 300 kPa

A mercury barometer located in a lab has a height of 750 mm. What is the atmospheric pressure in kPa if the density of mercury is taken to be 13,600 kg/m3 and acceleration due to gravity to be 9.81 m/s2? Multiple choice question.

100.1 kPa

The absolute pressure in a tank is 115 kPa, and the local atmospheric pressure is 97 kPa. If a U-tube with mercury (density = 13550 kg/m3) is attached to the tank to measure the gage pressure, what column difference will it show in mmHg?

135 = (Pabs - Patm)/ pg

A manometer attached to a pressurized nitrogen tank reads 30 centimeters of mercury. If the atmospheric pressure is 96 kPa, what is the absolute pressure in the tank? Consider the acceleration due to gravity to be equal to 9.81 m/s2 and the density of mercury to be equal to 13,500 kg/m3.

135.73 kPa = Patm + pgh

One atmospheric pressure can be approximated to be 14.7 psi. If a tire's gage pressure is 35 psi, what is its corresponding absolute pressure? Multiple choice question. 49.7 psi 70 psi 20.3 psi 300 psi

14.7 + 35 = 49.7

300 K is equal to _____ °C. Multiple choice question. 573.15 300 32 −73.15 26.85

26.85

The Kelvin scale temperature is equal to the Celsius scale temperature plus _____. Multiple choice question. 32 10 459.67 273.15

273.15

The density of water is assumed to be a constant of 1000 kg/m3. If the gage pressure of a water column 10 m high is 10 kPa, then the gage pressure of a water column 30 m high should be _____.

30 kPa

If the density of a substance is 790 kg/m3, what is its specific gravity? Consider the density of water to be 1000 kg/m3. Multiple choice question. 79 0.79 0.079 790,000 7.9

790/1000 = 0.79

If the gas pressure inside a sealed tank is 689 kPa absolute, what is this pressure equal to in pound-force per square inch? Multiple choice question. 1500 psi 29 psi 99.93 psi 150 psi 14.73 psi

99.93 psi

For the following devices in normal operation, which ones can be approximated as steady-flow devices? (Check all that apply.) Multiple select question. A compressor A centrifugal pump A heat exchanger A reciprocating engine A turbine

A centrifugal pump A heat exchanger A turbine

Select the correct statements regarding the definition of cycle. (Check all that apply.) Multiple select question. A system is said to be in cycle if it may always remains at a constant state. A system is said to be in cycle if it does not have identical initial and final states. A system is said to be in cycle if it always returns to its initial state at the end of the process. A system is said to be in cycle if it has identical initial and final states.

A system is said to be in cycle if it always returns to its initial state at the end of the process. A system is said to be in cycle if it has identical initial and final states.

If a system reaches a given state, which of following statements is true? Multiple choice question. If multiple properties change values in the system, the system can remain in the same state. All the properties of the system have fixed values at a given state. The state cannot be described by any properties. With the exception of pressure, temperature and density will have fixed values.

All the properties of the system have fixed values at a given state.

Identify the statements that are true about the state and equilibrium of a system. Multiple select question. A system will be able to remain in a given state even if values of multiple properties change. For a system in a given state, if one property changes value, the state will remain unchanged. At a given state, all the properties of a system have fixed values except pressure and temperature. In an equilibrium state, there are no unbalanced potentials. At a given state, all the properties of a system have fixed values.

At a given state, all the properties of a system have fixed values. In an equilibrium state, there are no unbalanced potentials.

Which of the following units are units of pressure? (Check all that apply.) Multiple select question. N Pa psi K

Pa, psi

Select the correct relationship of absolute pressure, atmospheric pressure, and gage pressure. Multiple choice question. Patm = Pabs + Pgage Pgage = Patm/Pabs Pabs = Patm + Pgage Pabs = Patm/Pgage

Pabs = Patm + Pgage

Which of the following is true for pressure? (Check all that apply.) Multiple select question. Pressure is a vector quantity. Pressure is defined as a tangential force exerted by a fluid per unit area. Pressure is defined as a normal force exerted by a fluid per unit area. Pressure in fluid systems is similar to normal stress in solids.

Pressure is defined as a normal force exerted by a fluid per unit area. Pressure in fluid systems is similar to normal stress in solids.

Which one of the following is a quasi-equilibrium process? Multiple choice question. Stirring and mixing of cream in hot coffee Slow and steady compression of air in a cylinder A balloon bursting Fast expansion of a gas in a nozzle

Slow and steady compression of air in a cylinder

Which of the following statements about specific properties are true? Multiple select question. Extensive properties per unit density are called specific properties. Specific volume is an example of specific property. Intensive properties are dependent on mass. Extensive properties per unit mass are called specific properties

Specific volume is an example of specific property. Extensive properties per unit mass are called specific properties.

Which of following statements is true? Multiple choice question. An isolated system must be a closed system. A closed system must be an isolated system. A system cannot be both closed and isolated

an isolated system must be a closed system

Atmospheric pressure is measured by a device called a(n) _____. Multiple choice question. thermometer tachometer barometer accelerometer

barometer

Which of the following systems cannot be thermodynamically analyzed using a control volume (open system) approach? Multiple choice question.

compressed nitrogen in a sealed tank

A system is said to have undergone a __________ if it returns to its initial state at the end of the process.

cycle

From the following properties, select one that is not classified as an extensive property. Density Volume Momentum Mass

density

The gage pressure in a liquid of constant density _____ when the liquid depth is doubled. Multiple choice question. quadruples is quartered is halved doubles stays the same

doubles

A system is a simple compressible system in the absence of _____ and surface tension effects. (Check all that apply.) Multiple select question. electrical gravitational motion heat transfer magnetic

electrical, magnetic, gravitational, motion

Any characteristic of a system is called a thermodynamic state.

false

True or False: A rigid tank containing ionized gases kept under the influence of a magnetic field is a simple compressible system.

false

True or False: The weight of a system is an intensive property.

false

The term uniform flow implies flows with no change with _____ over a specified region. Multiple choice question. density pressure mass temperature location

location

A closed system does not allow _____ to cross the system's boundary. Multiple choice question. energy mass energy or mass

mass

Which of the following properties are extensive properties? (Check all that apply.) Multiple select question. Temperature Weight Volume Mass Density

mass,volume and weight

Pressure is defined as a _____ force exerted by a fluid per unit area. Multiple choice question. centripetal radial tangential normal

normal

The series of states through which a system passes during a process is called the __________ of the process.

path

A solid-state device that works on the principle that an electric potential is generated in a crystalline substance when it is subjected to mechanical pressure is called a(n) _____. Multiple choice question. piezoelectric transducer deadweight tester manometer barometer tachometer

piezoelectric transducer

The _____________ remains constant during an isobaric process.

pressure

A manometer is used to measure _____. Multiple choice question. pressure differences velocity force temperature differences acceleration

pressure difference

Any change that a system undergoes from one equilibrium state to another is called a _____. Multiple choice question. reform process state cycle

process

Any characteristic of a system is called a _____. Multiple choice question. path mass state temperature property

property

If a gas in a piston-cylinder device undergoes a quasi-equilibrium compression, the pressure in the system _____. Multiple choice question. varies linearly with specific volume is held constant throughout the entire process remains nearly uniform throughout the system at each moment in time decreases if the volume decreases

remains nearly uniform throughout the system at each moment in time

Density is defined as mass per unit volume. The reciprocal of density is called ___________________

specific volume

Which property remains constant if the process is isochoric? Multiple choice question. Potential energy Mass Specific volume Pressure Temperature

specific volume

The mass or region outside the system is called the _____________

surroundings

An isothermal process is a process during which the _____________ remains constant.

temperature

Two bodies that have reached thermal equilibrium will have the same _____. Multiple choice question. temperature mass density pressure volume

temperature

The density of a substance is most likely dependent on _____. (Check all that apply.) Multiple select question. force humidity temperature pressure

temperature and pressure

Two bodies are brought into contact in an isolated enclosure until they both reach the same temperature. At this point, the heat transfer stops, and the two bodies have reached a state of _____. Multiple choice question. chemical equilibrium mechanical equilibrium phase equilibrium thermal equilibrium

thermal equilibrium

Which one of the following is not a pressure measurement device? Multiple choice question. Thermocouple Bourdon tube Manometer Barometer Strain-gage pressure transducer

thermocouple

True or False: Gage pressure can be positive or negative.

true

True or False: Specification of two independent intensive properties in a simple compressible system is sufficient to completely define the state of the system.

true

According to the state postulate, the state of a simple compressible system is completely specified by ______________ independent _______________ properties.

two, intensive

Extensive properties per _____ are called specific properties. Multiple choice question. unit degree unit mass unit time unit mole unit volume

unit mass

System A is a thermometer. Systems B and C are not in contact with one another but both have the same temperature reading on system A. It can be stated that systems B and C are in thermal equilibrium because of the _____ law of thermodynamics. Multiple choice question. second zeroth first third

zeroth