Determine the normal force for a laundry basket with a mass of 4.2 kg in each of the following situations
(a) at rest on a horizontal surface
_____ N
(b) at rest on a ramp inclined at 12° above the horizontal
__________ N
(c) at rest on a ramp inclined at 25° above the horizontal
________ N
(d) at rest on a ramp inclined at 45° above the horizontal
_______N