If a humming bird flew into a running car and was still off the ground while inside, would it need to fly at the speed of the car, or float as if the car were not moving? Why? Does having the windows open/ closed change anything (assuming the bird is already inside)?

Do anyone have any strategies, guides, videos, or anything relating to identifying unsteady/steady and open/closed systems in thermodynamic problems? I am struggling to identify these features when doing problems, and the text does not explicitly state a process on determining these.

A tuning fork of 440 hertz is held above a closed pipe resonator and energized. Determine 2 locations where the pipe will produce constructive interference. Determine one location when destructive interference will occur. Explain in detail how and why these phenomena occur.

Determine if there exist a nonempty set S with operation ⋆ on S and a nonempty set S′ ⊂ S, which is closed with respect to ⋆, satisfying the following properties.

1) S has identity e with respect to ⋆. ′

2) e ∈/ S .

3) S′ has an identity with respect to ⋆.

Course : Heat Transfer

question 3

a-) In heat transfer by radiation, describe the swallowing,reflection, passing coefficients, write down the relation between them.

b-)Write the expression radiative heat transfer between two surfaces with different areas in a closed volume.

If a ground water contains H2S at concentration of 2 mg/L, determine the concentration of H2S in head space of a closed tank containing the ground water at at 20 ^oC. Given that for H2S, Henry’s constant (H) is equal to 5.15×10² atm at 20 ^oC.

a) What does the Postclosing Trial Balance represent? What is included in it and why is it important?

b) What are the temporary accounts and why are they closed each period?

c) Describe the closing entries and prepare them in proper form?

d) Identify the steps in the accounting cycle.

Organizations are currently open systems. Why are organizations considered open systems as opposed to closed systems? Explain various concepts/ways that help organizations be or become open systems. How can organizations remain open when the world is asked to socially isolate?

Water is flowing at 4.00m/s in a 12.00mm diameter pipe under a pressure of 2.000*10^4 N.m^2 in the basement is part of a closed system. What is pressure and speed of the water in a 7.00mm diameter pipe at the top of the 40.0m building? As clearly as possible please!