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Physics > A2 - Applied > Flashcards

A2 - Applied Flashcards

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1
Q

What is the definition of an isobaric system?

A

Pressure stays constant

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2
Q

How is an isobaric system created

A

Frictionless piston allowing pressure to be in equilibrium with surrounding.

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3
Q

What is characteristic of an isothermal system.

A

Constant temperature. Since I proportional to temperature, U=0

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4
Q

What key work is used for isothermal systems?

A

Slow

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5
Q

What is constant for an isothermal system? How is this derived from ideal gas law?

A

Pv constant. P=nkt/v. Since nkt constantly the, it looks like 1/x graph.

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6
Q

How do you test for an isothermal system.?

A

Check is pv is constantly the for all points on curve.

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7
Q

What is characteristic of isometric system?

A

Volume is constantly the.

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8
Q

What is constant in an isometric system.?

A

No work done.

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9
Q

What is the overall plot for an isomeric system.?

A

Horizontal line as pressure costsant

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10
Q

What is the shape of an isothermal Pv plot?

A

1/x plot.

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11
Q

What is the shape of an isometric pv plot?

A

Vertical line.

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12
Q

How do you calculate change in Intetnal energy of isomeric system?

A

Work=pv, hence area, U=Q-(pv)

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13
Q

How much work is done in an isometric system?

A

No work.

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14
Q

What is characteristic of an adiabatic system?

A

No heat transfer to he surroundings. Q=0

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15
Q

What is the difference between adiabatic and isothermal pv plots?

A

Adiabatic is steeper.

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16
Q

Which two words characterise adiabatic systems?

A

Insulated, rapid.

17
Q

If the moment of I extra of roundabout is decreased, explain why the roundabout speeds up.

A

Angular momentum conserved, so the angular speed increased if I decreases.

18
Q

How do you calculate the indicated power of FOUR STROKE engine from pV plot?

A

area enclosedcylinderscycles/min DIVIDED BY 2,

One in every two is a power stroke.

19
Q

Why is diesel injected slightly before the top of the piston stroke

A

The fuel is compressed and starts to burn before top dead centre, maximising the pressure increase due to expanding fuel/air mixture, increasing power produced per stroke.

20
Q

Why is the COP of heat pump greater than when working as refrigerator?

A

Work done + Qout=Qin for refrigerator, so Qin > Qout, therefore, looking at COP equations, we can see that COP for heat pump greater than refrig. for constant work done

Physics (9 decks)

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