![hardwick744](/avatars/29616.jpg)
hardwick744
05.05.2020 •
Mathematics
Please help me asap i will mark branlist
Solved
Show answers
More tips
- F Family and Home Daughter says: If you don t want to do it, don t do it. Should we persuade her?...
- H Health and Medicine How Did Inna Lose Weight on Dom 2?...
- H Health and Medicine Coughing: Causes, Types, and Treatment Methods...
- H Health and Medicine How to Treat the Flu: A Comprehensive Guide...
- O Other What is a Disk Emulsifier and How Does it Work?...
- F Family and Home What does a newborn need?...
- F Family and Home Choosing the Right Car Seat for Your Child: Tips and Recommendations...
- F Food and Cooking How to Get Reconfirmation of Registration?...
- C Computers and Internet How to Get Rid of Spam in ICQ?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
Answers on questions: Mathematics
- M Mathematics Lenny s car is worth $18,000 after 5 years. when the car was new, it sold for $24,000. what is the depreciation rate?...
- M Mathematics PLEASE DO BOTH I NEED IT DONE AHH...
- M Mathematics Simplify the expression: ( 1 - ( 9x^2 + 4 ) / 2 ) / ( 1 / 3x - 1 / 2 ) + 1...
- M Mathematics Which expression represents 10 subtracted from the quotient of 3 and a number ? a. 3n-10 b. 3/n - 10 (the / is a fraction bar) c. 10 - 3n d. 10 - 3/n (the / is a fraction bar)...
- C Chemistry Identify the green-yellowish gas that is used as a disinfecting agent. identify the green-yellowish gas that is used as a disinfecting agent. iodine bromine fluorine chlorine...
Ответ:
Either B or D
Sorry that its not one answer i just think its one of those 2 and dont wnat to just give u one answer cause i dont want u to get it wrong
Ответ:
a)![A_x=5.5cm\\A_y=0cm\\B_x=-6.495cm\\B_y=3.75cm\\](/tpl/images/0299/3263/9e43a.png)
b)![(A+B)_x=-0.995cm\\(A+B)_y=3.75cm](/tpl/images/0299/3263/365d9.png)
c)![|A+B|=3.880cm \\ \theta_{A+B}=104.86^{\circ}](/tpl/images/0299/3263/451d3.png)
Step-by-step explanation:
If we call A and B the longitude of the vectors, and measure
from the positive x axis in anti-clockwise direction (as usual), the x and y components are determined by the formulas:
An angle of 30 degrees above the negative x axis is an angle of 180-30=150 degrees from the positive x axis in anti-clockwise direction. So we will have:
The sum of the 2 vectors (each of the components of their sum) in terms of their components will be:
Since
and
are the sides of a right triangle, the magnitude of the sum of A+B (which we will call |A+B|) will be given by the Pythagoras formula, and the angle can be calculated with the formula of the arc tangent since
:
For the angle one has to be careful since the arctan function cannot interpret some results. In our case, the vector A+B is on Quadrant II (negative x, positive y), so the best way will be to calculate the angle above negative x (using the absolute values of the components), and to 180 substract this value, then: