Molecular Physics | Thermodynamics Answers

A square plate of side 12cm is made of metal of linear expansivity 2*10-5 k as the plate is heated from 30degree c to 100degree c , the area of one of the face of the plate will increase to ?

a quantity of low density gas in rigid container is initially at room temperature ( 20 degrees C ) and a particular pressure P1. If the gas Is heated to a temperature of 60 degrees C, by what factor does the pressure change.

3. James (26 kg) sits on a wheeled office chair (16 kg) holding a fire extinguisher (18 kg when empty). He points the discharge horn to the right and ejects 9 kg of carbon dioxide at 20 m/s. What is his speed and direction after the fire extinguisher is emptied (assuming friction is negligible)?

Air is contained in a vertical piston–cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 1 bar on the top of the piston, which has a mass of 45 kg and a face area of .09 m2 . Electric current passes through the resistor, and the volume of the air slowly increases by .045 m3 while its pressure remains constant. The mass of the air is .27 kg, and its specific internal energy increases by 42 kJ/kg. The air and piston are at rest initially and finally. The piston–cylinder material is a ceramic composite and thus a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g=9.81 m/s2 . Determine the heat transfer from the resistor to the air, in kJ, for a system consisting of (a) the air alone, (b) the air and the piston

What is thermodynamic process

A certain aluminum alloy has a coefficient of linear expansion of 2.4×10^5. A container made of this alloy has an internal volume of 2.000L and a depth of 17.5cm. It is filled to the top with gasoline,which has an average coefficient of volume expansion of 9.60×10^-4 °C^-1. Initially the temperature is 21.0°C,and the entire system is slowly warmed until both the cylinder and gasoline are at 89.0°C.

(a).How much gasoline flows(enter your answer in cm^3).

(b).What is the volume (in cm^3)of gasoline remaining in the cylinder at 89.0°C?.(Give your answer to at least four significant figures).

(c).If the combination with this amount of gasoline is then cooled back to 21.0°C,how far below the cylinder's rim (in cm) does the gasoline's surface recede?

A 36.0g ice cube floats in 240g of water in a 100g copper cup,all are at a temperature of 0°C.A piece of lead at 99.0°C is dropped into the cup,and the final equilibrium temperature is 12.0°C.What is the mass of the lead?.(The heat of fusion and specific heat of water are 3.33×10^5 J/kg and 4,186 J/kg.°C, respectively.The specific heat of lead and copper are 128 J/kg.°C and 387 J/kg.°C).

An electric heater is used to heat 0.5kg of water in a kettle of heat capacity 400j/k, kept at 20degrees celsius.

what mass of water is boiled away in 600s? (Neglect heat losses)

What is a thermodynamic state?

What is a thermodynamic process?

For 2.4 to 2.6, fill in the missing word.

2.4. A system can be taken from a given initial state to a given final state through____________ number of processes.

2.5. Heat may or may not be involved and in general work 𝑊 and heat 𝑄 will have ____________ values for different processes.

2.6. Therefore heat 𝑄 and work 𝑊 are path _____________ quantities.