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Calculations

# Calculations - denominator cancels out with the seconds(s...

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Here are some hints as you work on calculations. I'm going to set up little tables to show you how I look at problems and how the units will cancel out. A conversion: 6.2 hours to seconds 6.2 hours 3600 seconds 1 hours 6.2 x 3600 = 22320, hours cancel out and the only unit left is seconds, final answer is 22320 seconds An Acceleration Problem: The acceleration due to gravity on Earth is 9.8 m/s 2 . How fast will a skydiver be traveling in m/s after falling for 3 seconds? acceleration = speed/time rearrange to speed = acceleration x time 9.8 m 3 s s 2 9.8 x 3 = 29.4, the meters (m) do not cancel out, and one of the seconds (s) in the

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Unformatted text preview: denominator cancels out with the seconds (s) associated with the "3". Final answer is 29.4 m/s (units are units of speed). A force problem: What is the acceleration of a 20 kg ball that has a force of 2.5 Newtons. Force = mass x acceleration, so acceleration = Force/mass 2.5 N 20 kg changing the unit Newton to kg*m/s 2 , see page 47. 2.5 kg * m 1 s 2 20 kg 2.5 / 20 = 0.125, kg cancel out leaving m/s 2 which are units for acceleration. Final answer is 0.125 m/s 2 ....
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Calculations - denominator cancels out with the seconds(s...

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