# English Version HSC 1st Paper 10th Chapter Physics Note

English Version HSC 1st Paper 10th Chapter Physics Note. Ideal gas and kinetic theory of gases. The physics is one of the oldest academic disciplines, perhaps the oldest through the inclusion of astronomy. In the last two millennia, physics was a part of natural philosophy, chemistry, certain branches of mathematics and biology, but during the scientific revolution in the 17th century, the natural sciences emerged as unique in its own right research programs. Physics intersects with many interdisciplinary areas of research, such as Biophysics and quantum chemistry, and physics limits are not rigidly defined. New ideas in physics often explain the fundamentals of other sciences mechanisms, to open new avenues of research in areas such as mathematics and philosophy.

## English Version HSC 1st Paper 10th Chapter Physics Note

Ideal gas and kinetic theory of gases

Question No. 1

The volume of an air bubble becomes double when it comes at the surface of a lake at the location A from its bottom. In the lake the pressure of air is 10 Nm, the temperature of the air is 18.6°C and the relative humidity is 52.4%. On the other day, in a lake of another location B, the temperature of the air is equal to that of the lake of the location A and the dew point is 7.4°C. At temperature 7°C, 8°C, 18°C and 19°C the saturated vapor pressures are respectively 7.5 x 10-3 m, 8.2 x 10-3 m, 15.6 x 10-3 m and 16.5 x 10-3 m mercury.

a. What is standard pressure? 1

b. Clothes are dried out in rainy season slower than that in winter. – Explain. 2

c. Determine the depth of the lake at the location A. 3

d. At what place as mentioned in the stem will a man feel more comfortable? Explain with mathematical analysis. 4

The answer to the question no. 1

a. The pressure that will support a column of mercury 760 mm high at sea level in the latitude of 45° and temperature of 0°C.

b. Wet clothes dry due to evaporation of water. The rate of evaporation depends on the amount of water vapor that exists in the air. At a constant temperature & pressure, the rate of evaporation increases with the decrease of water vapor in air & vice-versa. As humidity is comparatively less in winter than that of the rainy season, the rate of evaporation is greater in winter. Hence wet clothes dry late in the rainy season than winter.

c. If the depth of the lake is h, then we know, P1V1 = P2V2

.: h= 71.43 m (Ans.)

The answer to the question no. 2

a. The moment of inertia is a quantity expressing a body’s tendency to resist angular acceleration. The moment of inertia of a body with respect to an axis is defined by the sum of the products of the mass of each particle in the body and square of its perpendicular distance from that axis.

b. If a particle travels from a certain point and returns to that same point making a loop in a conservative force field, the network done by that force is zero.

The gravitational force acting between the sun & the earth is a conservative force and the earth is rotating in an elliptical closed path around the sun. Hence, the network done by this force is zero in spite of earth’s rotation.

Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over the last two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the scientific revolution in the 17th century, these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy.

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