Physic problems

Question

1. if your shower uses 7.95 liters per minute and you take one 10 minute shower every day how many gallons of water are you using every year ?
2. a respiratory patient requires 2.00 liters per minute of oxygen. the cylinders that provide the oxygen contain 660 liters each. how many cylinders per day are required to provide this flow
3. an eight-ounce cup of starbucks cappuccino has 75 mg of caffeine. how many grams of caffeine are in a 300 gallon container?
4. if your heart beats 72 times per minute and pumps 80 per beat , how many gallons per hour does your heart pump?
5. a drug must be administered 2 times per day at a dosage of 125 micrograms per kg of body mass. how many grams of medication will you need per seek to treat a 730 kg horse?

Answer 1

Start with 7.95L/min and then use dimensional analysis to change it into L/year

7.95L/min x 10min/ 1 day x 365 days/ 1 year = 29037.375L/year

Then change this into gallons/year using dimensional analysis

29037.375L/year x 1 gallon/3.785L = 7671.697gallons/year