# Mechanical Engineering homework help

Mechanical Engineering homework help. MAE\$101B, Spring\$2020\$Homework/Units\$and\$dB
(show\$all\$work)
figures.
a. 7.550×103 km\$to\$feet
b. 285\$K\$to\$degrees\$Fahrenheit\$
c. 6.85×104 ft\$lbf\$to\$joules
d. 14.7\$lbf/in2 to\$pascals
e. 77.7\$slug/ft3\$to\$grams\$per\$cubic\$centimeter
2) Using\$the\$rules\$for\$expressing\$SI\$units,\$express\$each\$of\$the\$
following\$in\$correct\$form\$if\$given\$incorrectly
a. 11.5\$cm’s
b. 475\$N
c. 9.5\$m/s/s
d. 5000\$K
e. 8,000\$pa
f. 25\$amp
g. 100.1\$m\$m
h. 62.5\$j
i. 300\$degrees\$Kelvin
3) Compute\$the\$power\$output\$of\$a\$225\$hp\$engine\$in
a. British\$thermal\$units\$per\$minute\$and\$
b. KiloVwatts
4) Convert\$a\$mass\$flow\$rate\$of\$195\$kg/s\$(typical\$airflow\$
through\$a\$turbofan\$engine)\$to\$slugs\$per\$minute
5) An\$acoustic\$wave\$has\$a\$sound\$pressure\$level\$(SPL)\$of\$80\$
dB\$re\$1µbar (Pref=1µbar).\$Find\$
a. The\$sound\$pressure\$level\$re\$1µPa (Pref=1µPa)
b. The\$sound\$pressure\$level\$re\$20µPa ( Pref to\$20µPa)
i. Hint:\$SPL=20*log10(P/Pref)
ii. 1µbar=0.1\$N/m2=105µPa
1µbar,\$what\$is\$the\$ratio\$Pnew/P\$equal\$to\$(P\$pertains\$
to\$the\$Pressure\$at\$80\$dB)
pressure\$levels\$(SPL)\$for\$the\$development\$of\$the\$human\$
capsule.\$The\$output\$of\$any\$sensor(microphones,\$
accelerometers) is\$an\$electrical\$signal.\$These\$electrical\$
quantities\$are\$often\$specified\$in\$terms\$of\$“levels”.\$The\$voltage\$
level\$is\$defined\$as\$VL(re\$Vref)=20log10(V/Vref).\$In\$order\$to\$
convert\$between\$electrical\$and\$acoustic\$(pressure)\$quantities\$
the\$sensor\$manufacturer\$furnishes\$the\$sensitivity\$data.\$The\$
sensitivity,\$Mo,\$of\$a\$microphone\$is\$defined as\$Mo=(V/P)\$
(V=voltage,\$P=pressure).\$\$This\$sensitivity\$is\$usually\$given\$in\$dB,\$
and\$this\$term\$is\$usually\$referred\$as\$“sensitivity\$level”\$ML(re&
following\$equation\$can\$be\$applied
SPL(re\$Pref)\$=\$VL(re\$Vref)VML(re&Mref)+20log10(Vref/(Pref *\$Mref))

Mechanical Engineering homework help

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