Two vectors are given by avector = 3.5i + 4.5j and bvector = 2.0i + 5.0j. Find the following:(adsbygoogle = window.adsbygoogle || []).push({});

(a) avector x bvector

(b) avector ·bvector

(c) (avector + bvector ) · bvector

(d) the component of avector along the direction of bvector

these are the answers i got

a)8.5k

b) 29.5

c) 58.5

d)16.2

i know that a through c are correct but d is incorrect, i calculated d by

cos-1 (29.5/(5.7*5.39) = 16.2

the 5.7 came from sqrt(3.5²+4.5²)

5.39 came from sqrt(2²+5²)

thanks in advance

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Another vector problem

**Physics Forums | Science Articles, Homework Help, Discussion**