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The pressure of steam flowing in a pipeline is measured with a mercury manometer. Some steam condenses into water. Estimate the steam pressure in kPa. Take the density of mercury as 13.6 × 103 kg/m3 , density of water as 103 kg/m3, the barometer reading as 76.1 cmHg, and g as 9.806 m/s2.

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Quantum Physics


The limiting value of the ratio of the pressure of gas at the steam point and at the triple point of water when the gas is kept at constant volume is found to be 1.36605. What is the ideal gas temperature of the steam point?

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Quantum Physics


The acceleration of gravity is given as a function of elevation above sea level by g = 980.6 – 3.086 × 10-6 H Where g is in cm/s2 and H is in cm. If an aero plane weighs 90,000 N at sea level, what is the gravity force upon it at 10,000 m elevation? What is the percentage difference from the sea-level weight?

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Quantum Physics


In a constant volume gas thermometer the following pairs of pressure readings were taken at the boiling point of water and the boiling point of sulphur, respectively: Water b.p. 50.0 100 200 300 Sulphur b.p. 96.4 193 387 582 The numbers are the gas pressures, mm Hg, each pair being taken with the same amount of gas in the thermometer, but the successive pairs being taken with different amounts of gas in the thermometer. Plot the ratio of Sb.p.: H2Ob.p. Against the reading at the water boiling point, and extrapolate the plot to zero pressure at the water boiling point. This gives the ratio of S b.p.: H2Ob.p. On a gas thermometer operating at zero gas pressure, i.e., an ideal gas thermometer. What is the boiling point of sulphur on the gas scale, from your plot?

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Quantum Physics


A stationary system consisting of 2 kg of the fluid expands in an adiabatic process according to pvl.2 = constant. The initial conditions are 1 MPa and 200°C, and the final pressure is 0.1 MPa. Find W and Δ E for the process why is the work transfer not equal to ∫ PdV?

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Quantum Physics


The first artificial earth satellite is reported to have encircled the earth at a speed of 28,840 km/h and its maximum height above the earth’s surface was stated to be 916 km. Taking the mean diameter of the earth to be 12,680 km, and assuming the orbit to be circular, evaluate the value of the gravitational acceleration at this height. The mass of the satellite is reported to have been 86 kg at sea-level. Estimate the gravitational force acting on the satellite at the operational altitude.

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Nuclear Physics


Prove that the weight of a body at an elevation H above sea-level is given by W = mg/g_0 (d/(d+2H))^2 Where d is the diameter of the earth.

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Nuclear Physics


Convert the following readings of pressure to kPa, assuming that the barometer reads 760 mmHg: (a) 90 cmHg gauge (b) 40 cmHg vacuum (c) 1.2 m H2O gauge (d) 3.1 bar

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Nuclear Physics