Magnetic blood flow meters function using which of the following?
a. magnetic relays
c. a Hall-effect type arrangement
b. magnetic bacteria
d. radioactive decay
C
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A future news release might report that a new planet has been found around a star very similar to our Sun. The system contains other planets as well like our solar system. This newly discovered planet is claimed to have a mass 40 times that of Earth and is located nearly 25 AU from the star it orbits. Which of the following would be a reasonable prediction about this planet, assuming it formed
like our solar system? I. The planet will probably have a mean density of around 5 g/cm3. II. The planet will probably have a radius of around five to ten times greater than Earth's. III. The planet will probably have several satellites. IV. The planet will probably have a composition that is mostly hydrogen and helium. a. I & IV b. I, II, & III c. II, III, & IV d. I, II, & IV e. I, II, III, & IV
An electrically polarized object normally has
A) a net charge of zero. B) displaced charges. C) both of these D) none of the above
An organ pipe makes a sound that has a frequency of 450 Hz when the temperature is 20°C. If the temperature is ten degrees colder the wavelength of sound produced in the pipe will
A. get shorter. B. get longer. C. stay the same. D. It is not possible to tell without more information
Which of the following represents a partial or total decarbonization of our energy supply?
A) switching from natural gas to nuclear power B) switching from coal to natural gas C) switching from oil (petroleum) to natural gas D) All of the above. E) None of the above.