SHS 311 Exam 1 Questions With Complete
Solutions
What |does |the |mass |and |spring |represent |in |explaining |a |vibration? |- |CORRECT |ANSWER✔✔-
Mass |(representing |inertia)
Spring |(representing |elasticity)
Analogy |used |as |a |modem |for |a |vibrating |object
What |is |the |equation |for |a |sinusoidal |vibration |and |what |are |the |three |parameters |in |the |
equation? |- |CORRECT |ANSWER✔✔-d(t)= |A |sin |(2 |ft+θ) |f=square |root |of |(s/m)
D(t)= |displacement |as |a |function |of |time |(t)
A= |(peak) |Amplitude, |distance |of |maximum |movement
f= |frequency, |number |of |cycles |per |second
θ= |starting |phase, |relative |starting |position
cycle |- |CORRECT |ANSWER✔✔-A |pattern |of |the |vibration |or |sound |pressure |wave |form |that |
repeats |itself
period |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-The |time |it |takes |to |complete |one |
cycle
frequency |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-number |of |cycles |completed |
on |one |second |(Hz)
How |are |period |and |frequency |related? |- |CORRECT |ANSWER✔✔-Period |in |s, |frequency |in |Hz |- |
frequency= |1/period
, Period |in |ms, |frequency |in |Hz- |frequency= |1000/period
peak |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-maximum |vibration |distance |in |a |
positive |direction
peak-to-peak |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-difference |between |positive
|peak. |(highest) |and |negative |peak |(lowest)
rms |amplitude |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-root |mean |square, |square |
first |then |add |and |divide |for |mean, |square |root |of |mean
starting |phase |- |CORRECT |ANSWER✔✔-Describes |the |starting |position |of |a |vibration |relative |
to |a |reference |starting |position
air |density |- |CORRECT |ANSWER✔✔-number |of |air |molecules |in |a |given |space |(certain |
location)
air |pressure |- |CORRECT |ANSWER✔✔-force |generated |by |the |movement |of |air |molecules
Relationship |between |air |density |and |pressure |- |CORRECT |ANSWER✔✔-proportional
What |is |condensation? |- |CORRECT |ANSWER✔✔-positive |air |density |and |pressure |(changes |
over |time |and |space)
What |is |rarefaction? |- |CORRECT |ANSWER✔✔-negative |air |density |and |pressure |(changes |over |
time |and |space)
What |determines |the |speed |of |sound |(c)? |- |CORRECT |ANSWER✔✔-density |of |found |medium, |
water |faster |than |air, |movement |speed |of |each |molecule
Solutions
What |does |the |mass |and |spring |represent |in |explaining |a |vibration? |- |CORRECT |ANSWER✔✔-
Mass |(representing |inertia)
Spring |(representing |elasticity)
Analogy |used |as |a |modem |for |a |vibrating |object
What |is |the |equation |for |a |sinusoidal |vibration |and |what |are |the |three |parameters |in |the |
equation? |- |CORRECT |ANSWER✔✔-d(t)= |A |sin |(2 |ft+θ) |f=square |root |of |(s/m)
D(t)= |displacement |as |a |function |of |time |(t)
A= |(peak) |Amplitude, |distance |of |maximum |movement
f= |frequency, |number |of |cycles |per |second
θ= |starting |phase, |relative |starting |position
cycle |- |CORRECT |ANSWER✔✔-A |pattern |of |the |vibration |or |sound |pressure |wave |form |that |
repeats |itself
period |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-The |time |it |takes |to |complete |one |
cycle
frequency |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-number |of |cycles |completed |
on |one |second |(Hz)
How |are |period |and |frequency |related? |- |CORRECT |ANSWER✔✔-Period |in |s, |frequency |in |Hz |- |
frequency= |1/period
, Period |in |ms, |frequency |in |Hz- |frequency= |1000/period
peak |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-maximum |vibration |distance |in |a |
positive |direction
peak-to-peak |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-difference |between |positive
|peak. |(highest) |and |negative |peak |(lowest)
rms |amplitude |(define, |measure/calculate) |- |CORRECT |ANSWER✔✔-root |mean |square, |square |
first |then |add |and |divide |for |mean, |square |root |of |mean
starting |phase |- |CORRECT |ANSWER✔✔-Describes |the |starting |position |of |a |vibration |relative |
to |a |reference |starting |position
air |density |- |CORRECT |ANSWER✔✔-number |of |air |molecules |in |a |given |space |(certain |
location)
air |pressure |- |CORRECT |ANSWER✔✔-force |generated |by |the |movement |of |air |molecules
Relationship |between |air |density |and |pressure |- |CORRECT |ANSWER✔✔-proportional
What |is |condensation? |- |CORRECT |ANSWER✔✔-positive |air |density |and |pressure |(changes |
over |time |and |space)
What |is |rarefaction? |- |CORRECT |ANSWER✔✔-negative |air |density |and |pressure |(changes |over |
time |and |space)
What |determines |the |speed |of |sound |(c)? |- |CORRECT |ANSWER✔✔-density |of |found |medium, |
water |faster |than |air, |movement |speed |of |each |molecule
