What are the units of work for a system analyzed in SI units

What are the units of work for a system analyzed in SI units? Kg kW KN KJ What is the change in energy (delta E) of a cycle? 0 kN 0 kj work Not enough information to solve. Suppose I have a black box. The black box consumes 30kw of power and u only get 15kW of useful power out. What is the efficiency of my blackbox? 75% 90% 66% 50% which of the following is a path function dependent on the process? Internal Energy Kinetic Energy Work. Density Which term is associated with flow energy? Work (P/P) 1/2 V^2 g^Z

Solution

1)Option (D)

SI unit for work is kJ

2)Option (B)

Change in energy for cycle is zero because initial and final states are same.

3) Option (H)

Efficiency of black box= (power output / power consumption)= (15/30)= 50%

4) Option (C)

Work always depends on the process path. Even though the initial and final states be same for a process, but along different paths the work is different.

5)Option (C)

The flow energy is the kinetic energy associated with the flow, therefore the term containing the velocity square is the answer.