 # cancelling out units, physical science homework help Anonymous
timer Asked: Jun 2nd, 2016
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## Tutor Answer

catuse
School: Cornell University   Problem #1 is essentially cancelling out units. For future reference, you can usually check your answers on problems like this one by googling "5 feet 2 inches in meters" or something similar. I'm using three significant figures because that seems to be what the conversion factors are in, but I don't know if that's what your teacher wants.Julie's height = (5 feet * .305 meters / feet) + (2 inches * 2.54 centimeters / inch * .01 meters / centimeter) = 1.57 meters = 157 cm.Julie's weight/mass = 105 lbs / (2.21 lbs / kilogram) = 47.5 kgDistance to school = 1.1 miles * 1.61 kilometers / mile = 1.77 kmHighway speed = 65 miles / hour * 1.61 kilometers / mile = 105 kilometers / hourOutlet voltage = 220 V = 220 VRoom temperature = 5 C / 9 F * (70 F - 32 F) = 21.1 CProblem #2 asks us to convert between scientific notation and long-form numbers.There are 6 digits in \$150,000, so our exponent is 10^5. \$150,000 / 10^5 = \$1.5, so the answer is \$1.5 * 10^5.For the next problem, we can just put it in a calculator and multiply together. 2.59 * 10^6 m = 2590000 m.We have to move the decimal 3 places to the right to make the 5 appear to the left of the decima...

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