Jupiter does not have a large metal core like Earth. How can it have a magnetic field?
a. The magnetic field is left over from when Jupiter accreted.
b. Its magnetic field comes from the Sun.
c. It has metallic hydrogen inside, which circulates and makes a magnetic field.
d. It has a large metal core.
Answer: c. It has metallic hydrogen inside, which circulates and makes a magnetic field.
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What prevents the pressure from increasing as a cloud contracts due to its gravity?
A) As the cloud becomes denser, gravity becomes stronger and overcomes the pressure buildup. B) The pressure is transferred from the center of the cloud to its outer edges where it can dissipate. C) Thermal energy is converted to radiative energy via molecular collisions and released as photons. D) Excess pressure is released in jets of material from the young stars. E) Once the cloud reaches a critical density, the pressure becomes degenerate and independent of temperature.
Microwaves have ________ wavelengths and ________ energies compared to the visual band
a. shorter, higher b. longer, lower c. shorter, lower d. longer, higher
A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude:
A) the object is positively charged B) the object is negatively charged C) the object is an insulator D) the object is a conductor E) none of the above
In a flat universe parallel lines
A) never converge. B) are concentric to each other. C) are mirror images. D) eventually meet.