1. The problem statement, all variables and given/known data A 22-gram mass is released from rest at position A on a stationary frictionless surface whose shape is that of a quarter circle of radius R = 0.66 m. (b) Determine the magnitude of the normal force that acts on the mass when it is at position B (it is at position B when the imaginary radii form a 48° on the top sector of the quarter circle and a 42° angle on the bottom half). 2. Relevant equations N = mgcosθ 3. The attempt at a solution In order to use the equation above to determine the normal force, you need would need an angle between the normal force vector and the mg vector but couldn't find any way to do so. The answer was given to us as 0.48 N, and I plugged that into the equation above to get θ = 77.14°, but I don't know any way I would be able to get that angle.