Mineral

A rose coloured mineral specimen is given to you for identification. It has a conchoidal fracture, no streak, and a non-metallic lustre. It can be scratched with a steel file, but not with glass or a pocket knife blade. It has no streak. Its mass is 53 grams. You place it in water and it displaces a volume of 20 cubic centimetres of water. a) What is the hardness of this mineral? Explain b) What is the specific gravity of this mineral? Show calculations c) Using all these properties, identify this mineral?

Final Temperature of an insulated tank

An insulated tank is divided into two parts by a partition. One part of the tank contains 2.5 kg of compressed liquid water at 60 degrees C and 600 kPa while the other part is evacuated. The partition is now removed, and the water expands to fill the entire tank. Determine the final temperature of the water and the volume of the tank for a final pressure of 10 kPa.

The mass of steam that condensed during a process

A room filled with saturated steam at 100 degrees C. Now a 5 kg bowling ball at 25 degrees C is brought to the room. Heat is transferred to the ball from the steam, and the temperature of the ball rises to 100 degrees C while some steam condenses on the ball as it loses heat (but it still remains at 100 degrees C). The specific heat of the ball can be taken to be 1.8kj/kg degrees C. What is the mass of the steam that condensed during that process?

Steam Engine Efficiency

A steam engine has an efficiency of 60%. If the waste heat has a temperature of 100 degrees F (38 degrees C), what is the temperature of the boiler?

Maximum Thermodynamic Efficiency

A company that produces pulsed gas heaters claims its efficiency is approximately 90%. If the engine operates between 250 degrees C and 25 degrees C, what is its maximum thermodynamic efficiency? I believe the answer is 43%, please give me a detailed correct answer.