Indicate whether the following statements are true or false. Explain. 53. If the
ID: 2073432 • Letter: I
Question
Indicate whether the following statements are true or false. Explain.
53. If the value of any property of a system changes with time, that system cannot be at steady state.
54. According to Archimedes’ principle, the magnitude of the buoyant force acting on a submerged body is equal to the weight of the body.
55. The composition of a closed system cannot change.
56. Temperature is the property that is the same for each of two systems when they are in thermal equilibrium.
57. The volume of a closed system can change.
58. The pressure unit psia indicates an absolute pressure expressed in pounds force per square inch.
Explanation / Answer
53) If the value of any property of a system changes with time, that system cannot be at steady state - TRUE
ANS) A system is said to be in steady state , if the property of a system does not change with respect to time.
Hence the above statement is TRUE.
54) Acccording to Archimedes` principle, the magnitude of the buoyant force acting on a submerged body is equal to the weight of the body - FALSE.
ANS) Archimedes` principle states that, the buoyant force that acts upwards on the submerged body is equal to the weight of the fluid volume displaced.
Hence the above given statement is FALSE.
55) The composition of a closed system cannot change - FALSE.
ANS) A closed system can exchange energy with the surroundings except matter. As long as matter stays within the boundry the above statement indicates to be false.
Hence the above given statement is FALSE.
56) Temperature is the property that is the same for each of two systems when they are in thermal equillibrium - TRUE.
ANS) Whenever two systems are in thermal equillibrium, there will be no change in temperature of the two system. In other words, the two systems are said to maintain constant temperature.
Hence the above statement is TRUE.
57) The volume of a closed system can change - TRUE.
ANS) As said before closed system can exchange energy with surrounding except matter. Considering this statement , lets take the example of fuel in a cylinder. This is a closed system example.Due to the movement of the piston, there will be change in volume of the fuel.
Hence the above statement is TRUE.
58) The pressure unit psia indicates an absolute pressure expressed in pounds force per square inch - TRUE.
ANS) psia - PSI Absolute. This is the absolute pressure measured relative to a full vaccum. It is expressed in pounds per square inch.
Hence the above statement is TRUE.