Physics Flashcards
Gravity
9.8m/s2=32.2ft/s2
Force=
Mass x acceleration
Weight=
Mass x gravity
What is a vector
Both magnitude and direction
1atm = how many torr and mmHG
760
Torr=mmHG
1atm = how many psi?
14.7
Doubling the diameter of syringe you decrease pressure by a factor of?
4
Work=
Force x displacement
State functions
Volume, pressure, or temperature
Measurable quantity about matter as it does nothing
Energy
Capacity for doing work
Cannot be lost but converted
Calorie vs calorie
Calorie = 1,000 calories
Calorie is kilocalorie
Joule
Standard unit of energy
Law of conservation of energy
The amount of energy is constant and is constantly being converted from one form to another.
Energy is neither created nor destroyed, but only converted to other kinds of energy
Internal energy
Sim of all ke and pé of the particles comprising the system
Zeroth law of thermodynamics
Temp of A=B
B=C
Therefore A=C and no heat will flow between
First law of thermodynamics
A Change in the internal energy of a system is equal to the sum of the heat flow of the system and the work by/on the system
Endothermic
Energy flows into the system
Exothermic
Energy flows out of system
Expansion
Work done by the system
Compression
Work done on the system
Second law of thermodynamics
Thermal contact heat flows from hot body to cold body
Third law of thermodynamics
It is not possible to lower the temp of an object to absolute zero
There is always some energy in object
Temperature is
Measurement of the tendency to gain or lose heat
Heat is
Energy which can be transferred
Heat capacity equals
Mass x specific heat
Heat required to raise the temp of a given material
Specific heat is
Amount of heat needed to raise the temp of 1 gram of material by 1 degree Celsius
Convection
Heat transfer by movement of a liquid or gas 30%
Air above heat source or flame
Cold air blowing
Conduction
Transfer of heat by the direct interaction of molecules in a hot area with molecules in a cooler area. 20%
Warm blanket on patient
Radiation
Energy emitted from an object.
No physical medium or contact.
40%
Evaporation
Heat lost through respiration.
Surgical prep left in the patients skin to dry. 10%
Power
Rate of doing work or rate if expending energy
Cylinder compressed and released
what is mass
amount of matter in object
velocity=
displacement/time
acceleration=
change of velocity/time
what are scaler quantities
magnitude only (no direction)
if start and stop at same spot, what is the displacement?
zero
displacement is
change in position with respect to specific origin (can be +, -, or zero)
work is measured in
joules
