07. Physics Flashcards
T/F:
The value of e in y = ex depends on the units used to measure x.
True.
e is a mathematical constant (approximate value 2.71828) and doesn’t change.
T/F:
A minimum point on a curve y = f(x) is defined by dy/dx = 0
True.
At both maximum and minimum points, the slope of the curve is 0.
The calculation of cardiac output from a thermodilution curve is an application of differentiation?
It is an example of integration.
A picofarad is 10^9 Farad?
It is 10^12
Energy = ?
force x distance
Force = ?
mass x acceleration
Unit of velocity?
m/s
Charge = ?
current x time
Atmospheric pressure at sea level = ? mmHg = ?mmH2O
1 atm = 10 m water pressure = 760 mmHg
Pressure = ?
force/area
?atmospheric pressure at sea level
101 bar
In considering energy and work:
The kinetic energy contained in 2 kg object moving at a velocity of 4 m/sec is 32 J.
T/F
False. Kinetic energy = 0.5 mv^sq = 16 J
Kinetic energy = ?
0.5 x mv^sq.
The work done in compressing a ventilator bellows of cross sectional area A, through a pressure differential P through a displacement d is Pd/A? T/F
False.
P.A.d
The work done in compressing a gas between two pressures and two volumes is proportional to the slope of the P-V curve between those two points? T/F
False.
Area under P-V curve
Triple point of water?
It occurs at 0.006 bar and
= 273.16 K
= 0 C
In adiabatic energy exchange in a gas, the temperature remains constant?
False.
No temperature change is an isothermal process;
- adiabatic implies no heat supplied or lost.
Water boils at a temperature which depends on ambient pressure?
T/F
TRUE.
As boiling occurs when SVP = ambient pressure.
Critical temp of water?
It is 364.10C
There is a span of 212 0 Fahrenheit between the ice point and boiling points of water?
T/F
span 180 degrees F
V directly proportional to T is Charles’ Law?
True
The Pressure-Temperature curve for a ‘perfect gas’ crosses the Temp axis at 273.16 K?
False.
This occurs at
0 kelvin
[-273 celcius]
Boyle’s Law written as:
P.V = nRT
represents an isothermal energy change? T/F
True
P1 V1 = P2 V2 represents what law?
Boyles
P.Vy = nRT,
where y = ratio of specific heat capacities at constant P and at constant V,
represents an adiabatic energy change? T/F
True
Critical temperature of O2?
- 116 C
Critical temp nitrous oxide?
Does it exist as liquid or gas in temperate climates?
36.4 degrees C
Exists as liquid even in temperate regions.
What is a critical pressure?
The pressure which is required to liquify a gas.
A gas must be below its critical temperature to liquefy it.
Boiling of a liquid occurs when SVP = ambient pressure.
T/F?
True.
Does the output from a vapouriser increase or decrease with higher altitude?
It increase
TRUE/FALSE:
If the output from a vaporiser changes due to a change of ambient P it does not need recalibrating because the partial pressure of the volatile from the vaporiser is unchanged.
True, partial pressure is what matters not the output.
The partial pressure in the alveolus of nitrous oxide at 50% concentration in a gas mixture is about 70 kPa?
False.
It is about 50% of 101 kPa ie approximately 50kPa
TRUE/ FALSE:
Diffusion hypoxia is due to the partial pressure difference of nitrogen between the alveolus and the blood.
While this partial pressure difference plays its part, the real cause of diffusion hypoxia is
The difference in SOLUBILITY in plasma between nitrogen and nitrous oxide.
Equimolar solutions of sodium chloride and glucose exert similar osmotic pressure.
true/ false?
FALSE
- Since NaCl dissociates into two osmotically active particles, it exerts twice the osmotic pressure of glucose.
One mole of any substance in 22.4 L water exerts an osmotic pressure of 1 bar.
T/F?
TRUE
The addition of a solute to a solvent lowers its SVP in relation to its osmotic pressure.
T/F
TRUE
What are the most osmotically active components of plasma?
Albumin
What are bridge circuits used for?
Bridge circuits are used primarily to improve accuracy of current outputs when the inputs might be distorted.
What voltages does the AC vary between?
240 V is the root mean square value; peak to peak is + 340 V to - 340 V
In an inductor:
The magnetic field induced in a coil induces a voltage which increases the driving voltage drop the coil?
T/F
False,
an inductor induces a VOLTAGE that OPPOSES the driving force.
With regards to inductors, is current proportional to frequency?
No, voltage is proportional to frequency.
With regards to inductors:
The time constant of a circuit containing L and R = L.R?
time constant = L/R
Operational amplifiers:
Designed to have high output resistance?
No,
high input resistance.
Operational amplifiers:
Can be used with single or double inputs? T/F
Cannot use single.
Single inputs mean the output is prone to noise.
Operational amplifiers:
Are similar op-amp circuitry can be used for ECG, EEG and EMG?
No, these all have different amplitudes and frequencies.
Is laser monochromatic or dichromatic?
Monochromatic
TRUE/ FALSE:
A Nd YAG laser is used to coagulate tissue?
TRUE
