I need solution for this question please Q4: Answer 3 of the following sentences ( precise answer please) (15M)

1- The damping force induced in the suspension system of a vehicle depends on several parameters,
what are they?

2- What are the apparent and the necessary conditions of the oscillatory motion of a system?
Give some examples of systems oscillate without achieving the apparent conditions.

3- Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point. Is it important? State why?

4- What is the shape factor and shape function? State the difference between them, and state their importance.

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

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?

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.