Question

I have a doubt which needs to be urgently solved cause i got a test tommorow!!!!!!!!The question is in the replies cause i cannot write a diagram or attach a diagram here!!!!! Its physics i know its a wrong section to ask at but i have no choice!!!!!!!

Answer 1

I want to know how can we find the vertical component of the force vector here for normal reaction using \[N _{a}\cos \Theta\] rather than\[N_{a}\sin \Theta\]

Answer 2

It depends on where your \(\Theta\) is

Answer 3

hang on i am scanning the diagram

Answer 4

here is the diagram pls answer quickly!!!!!!!!!!

Answer 5

this fairly easy

Answer 6

so answer it pls!!!!!!!!!!!!!

Answer 7

well , just consider the angle between theta1 and the vector mg

Answer 8

so then!!!!!!!!!!

Answer 9

this will be 90 - theta

Answer 10

then do trig in that triangle

Answer 11

fine!!! further ahead!!!!!!!

Answer 12

yeh.. im answering it , its just a bit slow lol

Answer 13

k sorry!!!!!!

Answer 14

i need to know why is the vertical component of say Na NaCos Theta and not Na sin Theta

Answer 15

yeh , its basically because sin(90-x) = cos(x)

Answer 16

lol, thats wrong cos(90-x) = sin(x)

Answer 17

but is that the triangle we can use to do this cause i don't think so!!!!!!! and now i am confused with the two comments u made

Answer 18

can any1 make a quick video and attach it i know i am asking way too much but pls do if possible!!!!!!!!

Answer 19

ill draw a picture on paint , hopefully it will help lol

Answer 20

k hopefully!!!!!!!!!!!!

Answer 21

ill do another one

Answer 22

second picture is just redrawing the top triangle in the previous picture, and marking in what you know

Answer 23

now in the second triganle you apply trig

sin( 90-x) = Na / Fy

Answer 24

but sin(90-x) = cos(x)

Answer 25

so Fy = Na / cos(x)

Answer 26

wait dont think thats right

Answer 27

thanks for ur effort but cud u use a the line tool to make the diagram cause this is really strange i am not able to make sense

Answer 28

to be honest I dont really know what you are asking , what is the actual question ?

Answer 29

and if you look at it , the second triangle , the one that has two sides ( one being the y axis and the other being the plane along the track

Answer 30

that is a right angled trangle , and the angle between the track and the y axis is just 90-theta

Answer 31

then you re draw the triangle and apply basic trig ratios and simply sin(90-x) to cos(x)

Answer 32

i am trying to relate it to the concept of vectors which we can represent on the x axis and the y axis!!!!!