A student is required to design an audio amplifier, which over audio frequencies, delivers 20 Watts to an 8-ohm speaker, when a 100-mV peak signal is applied to the input. Develop a test plan to verify that all requirements below have been met. Required:
a. Provide a description of the item to be tested and pertinent requirements.
b. Describe any electrical/environmental regulations or mandates that the system must be tested against.
c. Indicate any risks or issues that relate to product testing. For example, issues related to human safety or product damage that could occur when testing.
d. Describe the overall test approach to be used to test the product. This should be a top level description including the number of times the test will be run and under what conditions. Also, is this a test of single unit or multiple units? If multiple units, how many will be tested?

Oxygen is contained in a piston-cylinder system initially at a temperature of 40 °c and a pressure of 150 kpa. the piston is 1 m in diameter and initially 20 cm above the base of the cylinder. heat is added at constant pressure until the piston has moved 30 cm. a)-what is the mass of gas contained in the piston, in kg? b)-what is the final temperature of the system, in k? c)-using the table of properties of oxygen as an ideal gas, calculate the heat added to the system per unit mass, in kj/kg. d)-repeat this calculation assuming that the specific heat as a function of temperature is linear over this range of temperatures (i. e., assuming that the change in temperature is "small"). e)-repeat this calculation without this assumption (i. e., direct integration of empirical relation) f)- discuss the variations in your results across the methods (note: all methods will give close to the same answer, if calculated correctly). g)-using any of the methods that you conclude to be accurate, calculate the change in the specific internal energy of the system, in kj/kg.