Design a payroll class that has data members for an employee’s hourly pay rate and number of hours worked. 2) write a program with an array of eleven payroll objects. 3) the program should read the number of hours each employee worked and their hourly pay rate (before tax) from a file and call class function to store this information in the appropriate objects. 4) it should then call class function, once for each object, to return the employee’s net pay after 20% tax deduction, so this information can be displayed. a. sample data to test this program can be found in the payroll. dat file located on blackboard.

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

Fluids at rest possess no flow energy. a)- true b)- false

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?