PHY 138 - Chapter 2 Solutions

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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
() 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
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online