Blood as it enters the lungs has a high concentration of carbon dioxide and a low concentration of oxygen. The blood leaves the lungs with a high concentration of oxygen and a low concentration of carbon dioxide. What are the qualitative concentration gradients of CO2 and O2 in the lungs?
What will be an ideal response?
Qualitatively, the concentration gradient of oxygen is high, measured from the returning
blood to the lungs, while the concentration gradient for carbon dioxide is negative.
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Describe two observational tests that support general relativity
What will be an ideal response?
Elements above uranium in the periodic table do not exist in any appreciable amounts in nature because they have short half-lives
Yet there are several elements below uranium in atomic number with equally short half-lives that do exist in appreciable amounts in nature. How can you account for this? A) These are isotopes formed by living bodies. B) These isotopes were placed in nature by the testing of nuclear bombs. C) These isotopes were formed from the fusion of even smaller isotopes. D) These isotopes result from the radioactive decay of uranium.
A 320-kg satellite experiences a gravitational force of 800 N. What is the radius of the satellite's orbit? (Earth's radius is 6,400 km.)
A. 6,400 km B. 12,800 km C. 19,200 km D. 25,600 km
A gas undergoes a process A-B that traces a straight line in the p-V diagram. At A the gas has a pressure of 75 kPa and a volume of 12 L. At B the pressure is 60 kPA and the volume is 20 L. The heat gained in this process is 600 J
The internal energy of the gas at A is 70 J. What is the internal energy of the gas at B? A) 60 J B) 10 J C) 190 J D) 130 J E) 70 J