Homework Statement
A 3.9kg block hangs from a spring with constant 2160 N/m. The block is pulled down 6.2 cm from the equilibrium position and given an initial velocity of 1.5 m/s back towards equilibrium. The mass and spring are now immersed in water to damp the motion, so that the...
Sorry, working it out again I got 39.79;
a.b=(3x0+5x0+7x1) = 7
|a|=√83
|b|=√1
∴θ=cos-1(a.b/|a||b|)= 39.79
So for any equation ax+by+cz=d, will the normal vector always be (a,b,c)?
Thanks for your replies:)
Homework Statement
Find the angle between the plane 3x+5y+7z = 1 and the plane z = 0.
Homework Equations
a.b=|a||b|cosθ
The Attempt at a Solution
Hi, I know that I need to have both these planes in the form (x,y,z) and then find the dot product to find the angle between them. The...