PHY 138 - Chapter 2 Solutions

# PHY 138 - Chapter 2 Solutions - Problem 2.1(a The average...

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Problem 2.1 (a) The average speed in this case is a weighted average () hr km 9 . 52 hr 250 . 0 hr 750 . 0 hr 200 . 0 hr 500 . 0 hr 750 . 0 hr km 0 . 40 hr 200 . 0 hr km . 100 hr 500 . 0 hr km 0 . 80 = + + + + + = avg v (b) The total distance traveled is km 90 hr 250 . 0 hr 750 . 0 hr 200 . 0 hr 500 . 0 9 . 52 = + + + = = hr km t v d tot avg Problem 2.4 The average speed of the Olympic marathon record is ( ) ( ) hr mi 1 . 12 s 3600 hr 1 s 21 min 60 hr 1 min 9 hr 2 yd 1760 mi 1 yd 385 mi 26 = + + + = avg v Problem 2.19 (a) The average acceleration of the plane off the Stennis when the plane was initially at rest is 2 0 s ft 103 s 2.50 s 3600 hr 1 mi 1 ft 5280 hr mi 175 = = = = + = t v a at at v v (b) The distance that the plane moves is

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() ft 322 s 50 . 2 s ft 103 2 1 2 1 2 1 2 2 2 2 0 = = = + = Δ at at t v x Problem 2.21 The time that it takes the car to accelerate from 55 mph to 60 mph is s 7 . 3 s m 0.60 hr mi 1 s m 447 . 0
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## This note was uploaded on 07/09/2008 for the course PHY 138 taught by Professor Meitzler during the Summer '08 term at Sam Houston State University.

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PHY 138 - Chapter 2 Solutions - Problem 2.1(a The average...

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