PHY1025 Conversions Worksheet #2 | Assignment

PHY1025 Conversions Worksheet #2 Name:
______________________
Please be sure to neatly and clearly show all of your calculations and units conversion
fractions in order to earn credit for this exercise. Use my solutions to the first
conversions worksheet as a guide to what I’d like to see, but please be prepared to do
these kinds of problems without such help on the final two exams. Think of them as word
puzzles. Have fun!
1.How many ng (nanograms) are equal to 375 μg (microgram)?
I f 1 ng=0.001 μ g
375 μ g=(375 /0.001)=375000 ng
2.How many mg (milligrams) are equal to 375 ng?
If 1 ng=0.001 μ g
375 ng=(375∗0.001)=0.375 μ g
3.A car is driving at 85 miles per hour (MPH). Convert this speed to meters per second.
1 MPH=0.44704 m/ s
85 MPH=(85∗0.44704)=37.9984 m/s
4. If a drug has to be administered at 650 μg per kilogram of body mass, how many mg
do you administer to a 350 kg moose ?
650 μ g is administered∈1 kg
For 35 kg ,
650× 35
1 μ g=22750 μ g
But
1 mg=10−6 μ g
22750 μ g=0.02275 mg

5.A sprinkler system pumps 27 liters per second of water. Convert this volume flow rate
to gallons per minute (GPM).
1 litre/ second=15.8603 gpm
27 litres /second =(27∗15.8603)=427.959 gallons per minute
6.Your heart pumps about 70 mL of blood per beat and beats an average of 80 times per
minute. How many gallons of blood does your heart pump every hour?
mL /minute=70/80
1 mL/ min=0.00026 gpm
7 /8 mL /min=(7 /8∗0.00026)=2.275 × 10−4 gpm=0.01365 gallons per hour
7.A one-time intravenous antibiotic is to be given at a dosage of 750 μg per kg of body
mass. How many milligrams would you administer to a 300-pound patient?
1 pound=0.453592kg
300 pounds=(300∗0.453592)=136.078 kg
μ g administered=750 μ g∗136.078=102058.5 μ g
102058.5 μ g=102.0585mg
8.A classroom is about 3 meters high, 20 meters wide and 30 meters long. If the density
of air is 1.29 kg/m3, what is the mass of the air in the classroom?
Mass=volume∗density
Volume=l∗w∗h=3∗20∗30=1800 m3
Mass=1.29∗1800=2322kg