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A light year, the distant light travels in one year, is equal to 9.44*10^12 km. If Polaris is about 64 000 000 000 km from earth, how long will it take light from this star to reach the earth?
A meter is equal to 1 000 000 microns. Blue light has a wavelength of 4.7*10^-1 micron. Express this wavelength in meters.
John currently has enough money to buy 50 toy cars. If the cost of each car was 10 cents less, John could buy 5 more cars. How much money does John have to spend on the toy cars? a. $40 b. $45 c. $55 d. $75
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