Question

Help In Statcis :

Answer 1

How come the moment vector isn't a vector? -8 isn't a vector.

Answer 2

The Forces F1=3i-2j ,F2=6i+5j ,F3=-5i act at a point ,if the moment vector of the resultant of these forces about the origin point O (0,0) equals -8k then find the intersection point of the line of action of the resultant with y-axis and calculate the algebraic projection of the resultant vector in the direction of the vector OA where A=(3.4) .

Answer 3

its -8 K

Answer 4

What are the units of the moment vector? Is this torque?

Answer 5

What are the units of the moment vector though?

Answer 6

its torque

Answer 7

First let's find the resultant of these forces by adding them up.

Answer 8

I did that

Answer 9

Do you know what the line of action is?

Answer 10

Because I don't.

Answer 11

Is it like the radius vector?

Answer 12

I think its line of action intersects the y-axis at B (O,L)

Answer 13

I know how to calculate the projection at least.

Answer 14

its like OB x R =-8K

Answer 15

Ooooh.

Answer 16

So, OB would be parallel to the resultant vector, right?

Answer 17

Aha,I think so

Answer 18

Wait, no that can't be the case because OB goes through the origin. That mean any force in its direction has no rotational effect.

Answer 19

Is R the resultant force?

Answer 20

Sorry, I know the math and physics behind this stuff, I'm just really rusty on the terminology.

Answer 21

Ohhhhhh, In that case L (Jُ (times) R =-8k

Answer 22

Hell ya ! I got it !! Ty Wio

Answer 23

So you understand physics ? Cuz i got a question in it :D

Answer 24

@wio : U there ?

Answer 25

yeah

Answer 26

what is it?

Answer 27

Its about Electromagnetic Induction

Answer 28

ok

Answer 29

Give Reason:
Why the Effective value of alternating current intensity is directly propo. to the magnetic field at the same rate of thermal effect in a resistance or the same power as that generated by the considered a.c current

Answer 30

Okay I don't know how to answer that one.
You need to look up the formula.

Answer 31

Alright ,Ty :)