Recent content by hamsterB

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...