Compared with air pressure on the outside, air pressure inside an inflated stretched balloon is
A) less.
B) equal.
C) greater.
D) need more information
Answer: C
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A star has an apparent visual magnitude of +19 . Which will you need to see this star?
a. naked eye b. binoculars c. telescope like Hubble Space Telescope d. All of the other choices can be used.
The Dynamo Theory holds that
A) lightning plays a major role in generating our magnetic fields. B) any other planet of similar density will also have a strong magnetic field. C) the Earth's core, like Mercury's, is now a solid, rigid bar magnet. D) magnetic fields are generated by rapidly spinning, fluid magnetic interiors. E) the Earth's magnetic field must switch polarities every few million years.
Virtually the entire disk of the Galaxy has been mapped using the ________ wavelength
Fill in the blank(s) with correct word
A horizontal 100-N force exerted against a 1000-N block causes the block to slide on a level surface with constant velocity. The friction force on the block must be
1) zero. 2) 100 N. 3) 1000 N. 4) greater than 1000 N. In this case the pushing force and the friction force are 5) equal but oppositely directed. 6) an action-reaction pair. 7) both of these. 8) none of these.