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3 years ago

Join if you want............... Zoom 935 245 6687 and the code is 8imynL.

Mathematics

1 answer:

elena-14-01-66 [18.8K]3 years ago

3 0

Answer:

ooo ok I might join lol

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Two vectors A⃗ and B⃗ are at right angles to each other. The magnitude of A⃗ is 5.00. What should be the length of B⃗ so that th

creativ13 [48]

Answer:

Length of B is 7.4833

Step-by-step explanation:

The vector sum of A and B vectors in 2D is

$C=A+B=(a_1+b_1,a_2+b_2)$

And its magnitude is:

$C=\sqrt{(a_1+b_1)^2+(a_2+b_2)^2} =9$

Where

$a_1=Asinx$

$a_2=Acosx$

$b_1=Bsin(x+90)$

$b_2=Bcos(x+90)$

Using the properties of the sum of two angles in the sin and cosine:

$b_1=Bsin(x+90)=B(sinx*cos90+sin90*cosx)=Bcosx$

$b_2=Bcos(x+90)=B(cosx*cos90-sinx*sin90)=-Bsinx$

Sustituying in the magnitud of the sum

$C=\sqrt{(Asinx+Bcosx)^2+(Acosx-Bsinx)^2} =9$

$C=\sqrt{A^2sin^2x+2ABsinxcosx+B^2cos^2x+A^2cos^2x-2ABsinxcosx+B^2sin^2x} =9$

$C=\sqrt{A^2(sin^2x+cos^2x)+B^2(cos^2x+sin^2x)}$

$C=\sqrt{A^2+B^2} =9$

Solving for B

$A^2+B^2 =9^2$

$B^2 =9^2-A^2$

Sustituying the value of the magnitud of A

$B^2=81-5^2=81-25=56$

$B= 7. 4833$

8 0

3 years ago

the sales tax rate for a community is 6.75%. If you purchase an item for $500, how much will you pay in sales tax?

Anarel [89]

You will pay $533.75 total. $<span>33.75 being the sales tax</span>

6 0

4 years ago

Anita bought these supplies for school 5 packs of pencils that cost 0.79 each 8 pens for 1.19 each what was the total cost of th

Snezhnost [94]

Answer:

14.38

Step-by-step explanation:

1. multiply the 5 packs of pencils times 0.79 each (5x0.79 = 3.95)

2. multiply the 8 packs of pens times 1.19 each (8x1.19=9.52)

3. add the total of pens and pencils together (3.95+9.52=13.44)

4. multiply 13.44 times 7% sales tax (13.44x.07=0.94)

5. add the total plus the sales tax (13.44+0.94=14.38

5 0

3 years ago

Find the approximate perimeter of the figure below

goldfiish [28.3K]

I think it’s a because it says perimeter which means to add up all the sides but I could be wrong. I’m not really sure.

4 0

3 years ago

Read 2 more answers

PLEASE HURRY AND HELP

rjkz [21]

Answer:

1/8=0.125

Step-by-step explanation:

0.125/8 I 1.000 -8 / 20 -16/ 40 -40/0

6 0

3 years ago