Hydrostatic weighing, or "underwater weighing," is used to measure a patient's body composition. To do this...
Hydrostatic weighing, or "underwater weighing," is used to measure a patient's body composition. To do this measurement, the patient is weighed while standing on a regular scale and then weighed while immersed in water. By comparing these weights, the density and body fat percentage of a patient can be recorded. The weight of your patient on a regular scale is 610 Nand while immersed in water is 90 N. The density of water is 1000 kg/m3 and assume that g = 10 m/s2.
Part A
What is the volume of your patient?
What is the volume of your patient?
| 0.0090 m3 |
| 0.061 m3 |
| 0.52 m3 |
| 0.052 m3 |
Part B
If you were to unknowingly use salt water (ρ = 1025 kg/m3) in place of fresh water, how would this affect your measurement of the patient's density?
If you were to unknowingly use salt water ( = 1025 ) in place of fresh water, how would this affect your measurement of the patient's density?
| The patient's density would be measured as 0 kg/m3. |
| The patient's density would be measured lower than it actually is. |
| The patient's density would be measured correctly. |
| The patient's density would be measured higher than it actually is. |
Part C
What is the specific gravity of the patient?
What is the specific gravity of the patient?
| 0.15 |
| 1 |
| 1.17 |
| 0.85 |
Part D
If the depth at which the underwater measurements were taken was doubled, what would be the patient's apparent weight?
If the depth at which the underwater measurements were taken was doubled, what would be the patient's apparent weight?
| 180 N |
| 22.5 N |
| 90 N |
| 45 N |
Part E
Suppose that while immersed your patient breathes through a thin tube. If the maximum pressure difference your patient's lungs can manage and still breathe is 10,000 Pa, what is the maximum depth to which your patient can be immersed?
Suppose that while immersed your patient breathes through a thin tube. If the maximum pressure difference your patient's lungs can manage and still breathe is 10,000 , what is the maximum depth to which your patient can be immersed?
| 0.1 m |
| 1 m |
| 0.01 m |
| 10 m |
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