The standard unit of length, the meter, is now defined with reference to
a. a meridian on the Earth.
b. the French meter.
c. the speed of light.
d. a platinum-iridium bar.
e. a member of the royal family.
c
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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?
Magnet A has twice the magnetic field strength of magnet B and pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
A) about 50 N. B) exactly 100 N. C) more than 100 N. D) not enough information
A Life Calendar: Make a "life calendar" for hypothetical person. Assume that this person lived 80 years and represent the 80 year period as a single calendar year in which he or she was born on January 1st and died on December 31st
Estimate the calendar dates on which this person reached various life milestones. For example, when did he or she take their first step? Speak their first word? Start elementary school? Finish high school? When did he or she retire? Does your life calendar for this particular person give any insight into human lives in general?
Mort observes Velma's light-clock, as Velma passes. Mort thus observes Velma's clock to be
A) slow. B) on time. C) stopped. D) fast. E) moving backward in time.