Kein Bock at Medical University Of Sofia | Flashcards & Summaries

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# Lernmaterialien für Kein Bock an der Medical University of Sofia

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TESTE DEIN WISSEN
Meniscus
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TESTE DEIN WISSEN
Liquid-gas-boundary due to cohesion and adhesion forces
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TESTE DEIN WISSEN

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states that there is an equal probability for all nuclei of a radioactive element to decay

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TESTE DEIN WISSEN
Surface tension of liquids, coefficient of s.t. , molecular pressure
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TESTE DEIN WISSEN
S.T. = Property of liquid-surface that allows it to resist an external force, due to cohesive nature of molecules
- liquid surface at rest shrinks into minimum surface area possible
-greater attraction to each other (cohesion) than to molecules in air ( adhesion)
depends on liquid type, T, impurities
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TESTE DEIN WISSEN
Trickling
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TESTE DEIN WISSEN
Happens when surface tension is equal to weight of drop
F=W
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TESTE DEIN WISSEN
Gas embolism
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TESTE DEIN WISSEN
Difference of pressure on both sides of air bubble is directed against blood flow
-> equalization with blood pressure -> causes blood vessel occlusion -> gas embolism
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TESTE DEIN WISSEN
Mechanical deformation
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TESTE DEIN WISSEN
Plastic: irreversible
elastic: reversible

applied force changes shape/volume
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TESTE DEIN WISSEN
Newton‘s law
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TESTE DEIN WISSEN
1) object either remains at rest or continues to move at a constant velocity/straight line unless acted upon by external Force
2) F=m*a
3) body 1 exerts F on Body 2 -> Body 2 simultaneously exerts equal force in opposite direction on body 1
F1 = -F2
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TESTE DEIN WISSEN
Strength & hardness of materials
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Strength: ability to withstand stress
hardness: ability to resist deformation/abrasion

greater breaking stress-> stronger material
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Amorphous, crystalline, liquid crystalline states
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Characterised by arrangement of atoms/molecules
crystalline: solid, repeating 3D pattern
liquid crystalline: mobile atoms -> able to form lattice structure (polymorph)
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TESTE DEIN WISSEN
Moh‘s scale
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-measurement of ability of harder material to scratch softer one (chalk=1, diamond=10)
any material in scale with increasing hardness scratches the material that precedes it
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TESTE DEIN WISSEN
Molecular structure of bodies
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TESTE DEIN WISSEN
Molecules only react w/ molecules in its field of action
intermolecular forces:
cohesive (between identical molecules)
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TESTE DEIN WISSEN

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the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay

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Q:
Meniscus
A:
Liquid-gas-boundary due to cohesion and adhesion forces
Q:

A:

states that there is an equal probability for all nuclei of a radioactive element to decay

Q:
Surface tension of liquids, coefficient of s.t. , molecular pressure
A:
S.T. = Property of liquid-surface that allows it to resist an external force, due to cohesive nature of molecules
- liquid surface at rest shrinks into minimum surface area possible
-greater attraction to each other (cohesion) than to molecules in air ( adhesion)
depends on liquid type, T, impurities
Q:
Trickling
A:
Happens when surface tension is equal to weight of drop
F=W
Q:
Gas embolism
A:
Difference of pressure on both sides of air bubble is directed against blood flow
-> equalization with blood pressure -> causes blood vessel occlusion -> gas embolism
Q:
Mechanical deformation
A:
Plastic: irreversible
elastic: reversible

applied force changes shape/volume
Q:
Newton‘s law
A:
1) object either remains at rest or continues to move at a constant velocity/straight line unless acted upon by external Force
2) F=m*a
3) body 1 exerts F on Body 2 -> Body 2 simultaneously exerts equal force in opposite direction on body 1
F1 = -F2
Q:
Strength & hardness of materials
A:
Strength: ability to withstand stress
hardness: ability to resist deformation/abrasion

greater breaking stress-> stronger material
Q:
Amorphous, crystalline, liquid crystalline states
A:
Characterised by arrangement of atoms/molecules
crystalline: solid, repeating 3D pattern
liquid crystalline: mobile atoms -> able to form lattice structure (polymorph)
Q:
Moh‘s scale
A:
-measurement of ability of harder material to scratch softer one (chalk=1, diamond=10)
any material in scale with increasing hardness scratches the material that precedes it
Q:
Molecular structure of bodies
A:
Molecules only react w/ molecules in its field of action
intermolecular forces:
cohesive (between identical molecules)
Q:

A:

the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay

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##### Block 2

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