A) The weight of the box is given by:
W = mg
W = weight, m = mass, g = gravitational acceleration
Given values:
m = 3.46kg, g = 9.81m/s²
Plug in and solve for W:
W = 3.46(9.81)
W = 33.9N
B) The box is sitting at rest on the floor. This means that the box is in equilibrium; the two forces acting on it, its weight and the normal force that the floor exerts on it, are equal in magnitude and opposite in direction. Therefore the normal force N acting on the box has a magnitude of 33.9N
