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Xavier University – ATENEO DE CAGAYAN
MECHANICAL ENGINEERING DEPARTMENT
ME 12 F1 – Assignment No. 2
NAME _______________________________
1. A pressure gage at elevation 8 m on a side of a tank containing a liquid reads 57.4 KPa. Another gage at elevation
5 m reads 80 KPa. Determine the density of the liquid.
2. A closed tank contains compressed air and oil (S = 0.90) as shown in the figure.a U – tube manometer using
mercury (S = 13.6) is connected to the tank as shown. For column heights h1 = 90 cm; h2 = 15 cm and h3 = 22
cm, determine the pressure reading of the gage.
3. Find PA - PC if x = 3 m, y = 1 m and z = 2 m and the fluids A, B, and C are kerosene, water and kerosene,
respectively. Assume S = 0.8 for kerosene and S = 1 for water. (Pa-Pc) = -17.658 KPa)
4. A new scale N of temperature is divided in such a way that the freezing point of ice is 100°N and the boiling
point is 400°N. What is the temperature reading on this new scale when the temperature is 150°C? At what
temperature both the Celsius and the new temperature scale reading would be the same? (550; -50)
5. Compute the gravitational force between a proton ( m = 1.66 x 10 -27
kg) and an electron (m = 9.11 x 10-31
kg)
in an atom whose radius of electron orbit is 5.29 x 10-11
m.
Due Date: _________________
Send your solutions to: ymelliza@xu.edu.ph or yurigmelliza@gmail.com
Xavier University – ATENEO DE CAGAYAN
MECHANICAL ENGINEERING DEPARTMENT
ME 12 F1 – Assignment No. 3
Name ______________________________________
1. How much heat is removed to make ice of mass m = 0.720 kg at -10C from a liquid at 15C.
Specific heat of ice = 2.22 KJ/kg-C
Specific heat of water = 4.19 KJ/kg-C
Freezing point temperature of water = 0C
hF of ice = 334.9 KJ/kg
2. A pressure in the cylinder in the figure varies in the following manner with volume, P = C/V2
. If the initial
pressure is 500 KPa, initial volume is 0.05 m3
and the final pressure is 200 KPa, find the work done by the
system.
3. A quantity of a certain perfect gas is compressed from an initial state of 0.085 m3
, 100 KPa to a final state of
0.034 m3
, 390 KPa. the Cv = 0.724 KJ/kg-ºC and Cp = 1.020 KJ/kg-ºC. The observed temperature rise is 146ºK.
Calculate R, the mass present, and U
of the gas.
4. A mass of 0.05 kg of air is heated at constant pressure of 200 KPa until the volume occupied is 0.0658 m3
.
Calculate the heat supplied, the work and the change in entropy for the process if the initial temperature is
130ºC.
5. Steam with a flow rate of 1360 kg/hr enters an adiabatic nozzle at 1378 KPa, 3.05 m/sec with a specific volume
of 0.147 m3
/kg and with a specific internal energy of 2510 KJ/kg. The exit conditions are, P = 137.8 KPa,
specific volume = 1.099 m3
/kg, and internal energy = 2263 KJ/kg. Determine the exit velocity in m/sec.
Due Date: _________________
Send your solutions to: ymelliza@xu.edu.ph or yurigmelliza@gmail.com
ME 12 F1 Assignment 2 & 3

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ME 12 F1 Assignment 2 & 3

  • 1. Xavier University – ATENEO DE CAGAYAN MECHANICAL ENGINEERING DEPARTMENT ME 12 F1 – Assignment No. 2 NAME _______________________________ 1. A pressure gage at elevation 8 m on a side of a tank containing a liquid reads 57.4 KPa. Another gage at elevation 5 m reads 80 KPa. Determine the density of the liquid. 2. A closed tank contains compressed air and oil (S = 0.90) as shown in the figure.a U – tube manometer using mercury (S = 13.6) is connected to the tank as shown. For column heights h1 = 90 cm; h2 = 15 cm and h3 = 22 cm, determine the pressure reading of the gage. 3. Find PA - PC if x = 3 m, y = 1 m and z = 2 m and the fluids A, B, and C are kerosene, water and kerosene, respectively. Assume S = 0.8 for kerosene and S = 1 for water. (Pa-Pc) = -17.658 KPa) 4. A new scale N of temperature is divided in such a way that the freezing point of ice is 100°N and the boiling point is 400°N. What is the temperature reading on this new scale when the temperature is 150°C? At what temperature both the Celsius and the new temperature scale reading would be the same? (550; -50) 5. Compute the gravitational force between a proton ( m = 1.66 x 10 -27 kg) and an electron (m = 9.11 x 10-31 kg) in an atom whose radius of electron orbit is 5.29 x 10-11 m. Due Date: _________________ Send your solutions to: ymelliza@xu.edu.ph or yurigmelliza@gmail.com
  • 2. Xavier University – ATENEO DE CAGAYAN MECHANICAL ENGINEERING DEPARTMENT ME 12 F1 – Assignment No. 3 Name ______________________________________ 1. How much heat is removed to make ice of mass m = 0.720 kg at -10C from a liquid at 15C. Specific heat of ice = 2.22 KJ/kg-C Specific heat of water = 4.19 KJ/kg-C Freezing point temperature of water = 0C hF of ice = 334.9 KJ/kg 2. A pressure in the cylinder in the figure varies in the following manner with volume, P = C/V2 . If the initial pressure is 500 KPa, initial volume is 0.05 m3 and the final pressure is 200 KPa, find the work done by the system. 3. A quantity of a certain perfect gas is compressed from an initial state of 0.085 m3 , 100 KPa to a final state of 0.034 m3 , 390 KPa. the Cv = 0.724 KJ/kg-ºC and Cp = 1.020 KJ/kg-ºC. The observed temperature rise is 146ºK. Calculate R, the mass present, and U of the gas. 4. A mass of 0.05 kg of air is heated at constant pressure of 200 KPa until the volume occupied is 0.0658 m3 . Calculate the heat supplied, the work and the change in entropy for the process if the initial temperature is 130ºC. 5. Steam with a flow rate of 1360 kg/hr enters an adiabatic nozzle at 1378 KPa, 3.05 m/sec with a specific volume of 0.147 m3 /kg and with a specific internal energy of 2510 KJ/kg. The exit conditions are, P = 137.8 KPa, specific volume = 1.099 m3 /kg, and internal energy = 2263 KJ/kg. Determine the exit velocity in m/sec. Due Date: _________________ Send your solutions to: ymelliza@xu.edu.ph or yurigmelliza@gmail.com