0 m at 0 b 30 m at 60 c 90 m at 135 d 60 m at 240

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: − b = 3ˆ + ˆ − ˆ + 3ˆ = 2 ˆ − 2 ˆ ij i j i j !! 2 2 a−b = 2 +2 = 2 2 ( )( ) PHY 2048 Spring 2014 – Acosta, Rinzler Exam 1 solutions Problem 3 Four vectors are expressed in terms of a magnitude and an angle measured counter- clockwise from the x- axis: A: 6.0 m at 0° B: 3.0 m at 60° C: 9.0 m at 135° D: 6.0 m at 240° What is the x- component (or y- component) of the sum of these four vectors? (1) 3.8m (2) - 1.9m (3) 16.9m (4) 6.2m (5) - 9.0m Separately compute the x and y components of each vector: Ax = 6 cos 0 = 6 Bx = 3 cos 60! = 1.5 C x = 9 cos135! = −6.36 Dx = 6 cos 240! = −3 Sum = −1.86 Ay = 6 sin 0 = 0 By = 3 sin 60! = 2.6 C y = 9 sin 135! = 6.36 Dy = 6 sin 240! = −5.2 Sum = 3.76 Problem 4 Antarctica is roughly semicircular, with a radius of 2000 km. In a particular year the new snow that falls on the continent has an average thickness of T = 5.0 cm (or 10cm, or 15cm) (see figu...
View Full Document

This document was uploaded on 03/24/2014.

Ask a homework question - tutors are online