1.Humans breathe about 15 breathe in a minute.The average breath at rest contains 0.76 liter of air.About how many liters of air will you breathe while at rest for 25 minutes?
2.Greta ran the 400-m dash in 49.07 s.If Greta ran at a constant rate,how many meters did she run in one second?
285 liters of air.
1. To find out how many liters of air you will breathe while at rest for 25 minutes, first calculate the total number of breaths you take in 25 minutes. Multiply the number of breaths per minute (15 breaths) by the number of minutes (25 minutes) to get:
15 breaths/minute * 25 minutes = 375 breaths
Next, calculate the total volume of air in liters by multiplying the number of breaths (375 breaths) by the volume of air in each breath (0.76 liters/breath):
375 breaths * 0.76 liters/breath = 285 liters
Therefore, while at rest for 25 minutes, you will breathe approximately 285 liters of air.
2. To find out how many meters Greta ran in one second, divide the total distance she ran (400 meters) by the time it took her to run that distance (49.07 seconds):
400 meters / 49.07 seconds = approximately 8.14 meters/second
Therefore, Greta ran approximately 8.14 meters in one second.