Answer:
15. Velocity = 3 X 10^8
Distance = 1580 m
time = distance / velocity
t = 1580 / 3 * 10^8
t = 1580 * 10^-8 / 3
t = 158 * 10^-7/3
t = 5.26 * 10^-8 seconds
16. Converting the distance to 'm'
Given distance (in miles), multiplying by 1.609 to convert to km and also multiplying by 1000 to convert to 'm'
s= 4.8 * 1.609 * 10^7 * 1000
v = 3 * 10^8
t = 4.8 * 1609 * 10^7 / 3 * 10^8
t = 1.6 * 1609 * 10^-1
t = 2574.4 * 10^ -1
t = 2.5744 * 10^-4 s
17. Mass in 1 tsp of medicine = 5 mL at a density of 25 mg/mL
Mass in 1 tsp of medicine = 5 * 25 = 125 mg
Mass prescribed by the doctor = 375 mg
Number of table spoons required = Mass prescribed / Mass in 1 tsp
N = 375/125 = 3 table spoons of the medicine
18. Density of medicine = 400g/ 5mL = 80g / mL
Medicine required = 1500 g
Volume of medicine required = Medicine Required / Density of medicine
Volume = 1500 / 80 = 18.75 mL of medicine is required
Hence, the volume of the suspension should be at least 18.75 mL
19. Volume of 10 drops = 1 mL
Volume of 5 drops = 1/2 mL
The faucet is leaking 5 drops or 1/2 mL water per minute
Number of minutes in a day = 60 * 24 = 1440 minutes in a day
Water leaked in 1440 minutes = 1440 * 1/2 = 720
0.720 L (720 mL) Water leaked from the faucet in a day
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