By Bueche, Frederick J.; Hecht, Eugene; Hademenos, George J
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3 in 1. Convert 1 meter into centimeters: 1 m # 100 cm = 100 cm 1m 2. 54 cm 168 hours 1. Convert 1 week into days: 1 week # 7 days = 7 days 1 week 2. Use a second conversion factor to convert that into hours: 1 week # r 7 days 24 hours # = 168 hours 1 week 1 day 8760 hours 1. Convert 1 year into days: 1 year # 365 days = 365 days 1 year 2. Use a second conversion factor to convert that into hours: 1 year # 365 days 24 hours # = 8760 hours 1 year 1 day 23 24 Part I: Applying Physics s 504 1. 116.
What was your acceleration? That calculation looks like this: v -v 0 - 3350 cm/ sec ond a = ∆v = t f - t o = = -168 cm/ sec 2 ∆t 20 sec onds f o In other words, –168 cm/sec2, not +168 cm/sec2. There’s a big difference between positive and negative in terms of solving physics problems — and in terms of law enforcement. If you accelerated at +168 cm/sec2 instead of accelerating at –168 cm/sec2, you’d end up going 150 miles per hour at the end of 20 seconds, not 0 miles per hour. In other words, the sign of the acceleration tells you how the speed is changing.
A block of wood is shooting down a track at 10 meters per second and is slowing down because of friction. If it comes to rest in 20 seconds and 100 meters, what is its deceleration, in meters per second2? Solve It 16. A minivan puts on the brakes and comes to a stop in 12 seconds. If it took 200 meters to stop, and decelerates at 10 meters per second2, how fast was it originally going, in meters per second? 3 meters per second. What is the total distance traveled? This scenario sets you up to use one of the important equations of motion: vf2 – vo2 = 2as = 2a (xf – xo) This is the equation you use to relate speed, acceleration, and distance.