Deck 1: Introduction and Basic Concepts

Question 1

Consider a submarine cruising 30 m below the free surface of seawater whose density is 1025 kg/m³. The increase in the pressure exerted on the submarine when it dives to a depth of 110 m below the free surface is

A)480 kPa
B)804 kPa
C)1400 kPa
D)144 kPa
E)1100 kPa

Answer 1

804 kPa

Question 2

Consider an 85-m deep lake. The pressure difference between the top and bottom of the lake is

A)834 kPa
B)85 kPa
C)417 kPa
D)1220 kPa
E)2430 kPa

Answer 2

834 kPa

Question 3

The atmospheric pressures at the top and the bottom of a mountain are read by a barometer to be 93.8 and 100.5 kPa. If the average density of air is 1.25 kg/m³, the height of the mountain is

A)5360 m
B)683 m
C)547 m
D)8200 m
E)7650 m

Answer 3

547 m

Question 4

The pressure drop in a duct is to be measured by a differential oil manometer. If the differential height between the two fluid columns is 3.2 cm and the density of oil is 860 kg/m³, the pressure drop in the duct is

A)28 Pa
B) 135 Pa
C)482 Pa
D)270 Pa
E) 760 Pa

Question 5

A pressure gage connected to a tank reads 55 kPa at a location where the atmospheric pressure is 72.1 cmHg. The density of mercury is 13,600 kg/m³. The absolute pressure in the tank is

A)41 kPa
B) 56 kPa
C)82 kPa
D)246 kPa
E) 151 kPa**

Question 6

The pressure of a gas in a well-sealed vertical frictionless piston-cylinder device is to be increased by adding a mass of 25 kg on the piston. If the diameter of the cylinder is 14 cm, the increase in the pressure of the gas is

A)15.9 kPa
B) 0.25 kPa
C)0.56 kPa
D)1.8 kPa
E) 38.7 kPa

Question 7

An orange loses 1.2 kJ of heat as it cools per °C drop in its temperature. The amount of heat loss from the orange per °F drop in its temperature is

A)1.8 kJ
B)1.0 kJ
C)3.2 kJ
D)2.1 kJ
E)4.5 kJ

Question 8

The average body temperature of a person rises by 4°C during a sickness. The rise in the body temperature in Rankine is

A)6 R
B)8 R
C)7.2 R
D)4 R
E)2.2 R

Question 9

During a cooling process, the temperature of an object drops by 20°C. This temperature drop is equivalent to a temperature drop of

A)20°F
B) 68°F
C)36 K
D)36 R
E)293 K

Question 10

The density and the specific volume of a simple compressible system are known. The number of additional intensive, independent properties needed to fix the state of this system is

A)0
B) 1
C)2
D)3
E)4