A long solenoid (n = 80 turns/cm) carries a current of 70 mA. Determine the magnitude of the magnetic field inside the solenoid.
What will be an ideal response?
7.0 gauss
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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?
What is the particle X in the reaction 
a. 
b. 
C. e-
D. 
If we could watch spiral arms from a telescope situated above the Milky Way over 500 million years, what would we see happen?
A) Stars will move through the spiral arms, bunching up closer as they pass through. Young hot stars will form and die within the arms before having a chance to move out. B) The spiral arms will eventually unwind, as centripetal forces send the stars flying outwards into intergalactic space. C) The spiral arms will eventually dissipate and fade away, since they are a temporary phenomenon that should only last for a million years or so. D) The spiral arms will seem to "wind up," to wrap more and more tightly around the center of the Galaxy.
Refer to the graph. The object moves forward
A. in region A. B. in region B. C. in regions A and C. D. The object always moves forward E. The object never moves forward