Vector Algebra

Which of the following are cosine formula?

• $a=b\cos C+c\cos B$

• $a^2=b^2+c^2-2bc\cos A$

• $\cos\left(\alpha+\beta\right)$

• $c^2=a^2+b^2+2bc\cos\left(\pi-A\right)$

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

 $c\cos A+a\cos C=$  ______

• a

• b

• c

• B

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

 $\cos\left(\alpha+\beta\right)=$  ______

•  $\cos\alpha\cos\beta-\sin\alpha\sin\beta$  

•  $\cos\alpha\cos\beta+\sin\alpha\sin\beta$  

•  $\sin\alpha\cos\beta+\cos\alpha\sin\beta$  

•  $\sin\alpha\cos\beta-\cos\alpha\sin\beta$  

Tags

CCSS.HSF.TF.C.9

What is the formula to find work done?

• $W=\overrightarrow{F\ }\cdot\overrightarrow{d\ }$

• $W=\overrightarrow{M\ }\times\overrightarrow{F\ }$

• $W=\overrightarrow{\ t\ }\times\overrightarrow{\ r\ }$

• $W=\overrightarrow{F\ }\times\overrightarrow{d\ }$

Formula for finding torque is ______

• $\overrightarrow{\ t\ }=\overrightarrow{\ r\ }\cdot\overrightarrow{F\ }$

• $\overrightarrow{\ t\ }=\overrightarrow{\ r\ }\times\overrightarrow{F\ }$

• $\overrightarrow{\ t\ }=\overrightarrow{F\ }\cdot\overrightarrow{d\ }$

• $\overrightarrow{\ t\ }=\overrightarrow{F\ }\times\overrightarrow{d\ }$