16 Questions
What is the focus of the lecture Basic Physics for Radiography?
Defining units in relation to their relevance to radiography
Why is it mentioned that radiography works due to the underlying physics?
To highlight the consistency of physics laws in all technologies
What are the three ways heat energy can be moved around, as mentioned in the lecture?
Conduction, convection, radiation
According to the lecture, why is it important to define the seven base units in relation to their relevance to radiography?
To understand how units apply to radiography
What is the purpose of defining the concepts of force and acceleration in relation to Newton's three laws?
To show the relevance of Newton's laws to radiography
Why does the lecturer encourage writing down the learning objectives at the start of the lecture?
To provide a nice hook for students to practice defining terms
What is the purpose of cooling the coils with liquid helium in an MRI machine?
To generate strong magnetic fields
What is the temperature to which the coils surrounding the magnets in an MRI machine are cooled using liquid helium?
Minus 270 degrees centigrade
What is velocity?
The rate of change of position with respect to time
What is acceleration?
The rate of change of velocity with respect to time
In the context of radiography, how are electrons accelerated in an x-ray tube?
They are accelerated to quite a high fraction of the speed of light
What is the formula for acceleration when calculating the change in velocity over time?
$Vf - V0 / T$
What happens to velocity over time if acceleration is positive?
Velocity increases over time
What is the unit of acceleration?
$(m/s)^2$
In radiologic science, why is it important to understand basic physics concepts?
To underpin a lot of radiologic science
Why do the coils surrounding the magnets in an MRI machine need to be cooled to very low temperatures?
To allow them to have no resistance to electricity and generate strong magnetic fields
Learn about force, acceleration, work, energy, power, different forms of energy, conversion of energy, heat, and heat transfer mechanisms such as conduction, convection, and radiation.
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