A 12-M High by 2

Multiple Choice

A 1.2-m high by 2.8-m wide, vertical rectangular gate is used to control the flow of water from a reservoir to a grinding mill. A frictionless hinge runs along the bottom of the gate. The
Minimum force acting normal to and at the very top of the gate needed to hold the gate shut if
The water is at the very top of the gate, is nearest:

A) 6590 N
B) 9800 N
C) 10 000 N
D) 13 300 N How high above the hinge must the water be for the gate
To just open?