After seeing a flash of lightning, if one counts the seconds before hearing the thunder, one can estimate the distance to the flash. How many seconds delay
(a) per mile?
(b) per kilometer?
(a) 5. seconds per mile
(b) 3. seconds per km
You might also like to view...
One of the most likely places an advanced civilization might leave an artifact for us to find would be
A) in the desert of Roswell, New Mexico B) the L4 and L5 points in the Earth—Moon system C) in the Cydonia region of Mars D) on the far side of the Moon
How do observations of distant galaxies help us learn about galaxy evolution?
A) Observations at different distances show galaxies of different ages and therefore different stages of evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can observe two galaxies merging and what the result is, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
A radar installation operates at 9000 MHz with an antenna (dish) that is 15 meters across. Determine the maximum distance (in kilometers) for which this system can distinguish two aircraft 100 meters apart
a. 7.4 km b. 370 km c. 3700 m d. 37 km e. 740 km
Which example best illustrates kinetic energy?
A) A light bulb that is turned on B) A car that is parked on top of a hill C) A comet that is flying through space D) A battery that is connected to a circuit