A 3cm high fence is on the side of a hill and tends to lean over. The hill is inclined at an angle of 20o to the horizontal. A 6. 3m brace is to be installed to prop up the fence. It will be attached to the fence at a height of 2. 5m and will be staked downhill from the base of the fence. What angle to the nearest degree does the brace make with the hill?.

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600