Physics test

Jun 17th, 2015
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2. A lead ball at 30°C is dropped from a height of 6.0 km. The ball gets heated due to air resistance, and it completely melts just before reaching the ground. The molten substance falls slowly on the ground. Specific heat capacity of lead is 126 J/kg°C, and melting point is 330°C.

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Section 1Physics1.The following figure shows the graph of pressure versus density at three differenttemperatures for an ideal gas.(a) T1 > T2 > T3(c) T1 < T3 < T22.3.(b) T1 > T3 > T2(d)information insufficientA lead ball at 30C is dropped from a height of 6.0 km. The ball gets heated due to air resistance,and it completely melts just before reaching the ground. The molten substance falls slowly on theground. Specific heat capacity of lead is 126 J/kgC, and melting point is 330C. Assumingthat loss in mechanical energy is used to heat the ball, the latent heat of lead would be(a) 2.4 l04 J.kg(b) 3.6 104 J/kg(c) 6.0 104 J/kg(d) 2.22 104 J/kgFor a process on a system (gas enclosed in a vessel), the p-V graph has been isbeen is shown in the following figure. For this process, three statements aregiven as follows:I. During the process, work done by the system is continuously increasing.II During the process, work done by the system is continuously decreasing.III. During the process, internal energy of the gas is continuously increasing.IV. During the process, heat supplied to the system is continuously decreasing.(a) All the four state

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