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3. Radio stations are usually identified by their frequencies. A radio
station in the middle of the FM band has a frequency of 9.9E6 Hz
Calculate its wavelength if the speed of light is 3.0E8 m/s.
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It's true it didin't work becouse britain continued trading with it's colonies and the system hurt economies of the countries that used it

45 is the correct answer

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared. 

So since the snail is moving at 3.6  miles per hour you multiply by 5280 to change it into feet per hour. so you get 36*528 ft per hour. since there are 3600 seconds in an hour, you divide 36*528 by 3600. so simplifying we get 528/100 which is 5.28 ft per second