HELP ME with THESE QUESTIONS P L E A S E thanks

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HELP ME with THESE QUESTIONS P L E A S E ! thanks

6) a ladder on the ground is leaning against a wall. if the ladder is in static equilibrium,where must a friction force act on the ladder?
a. at the wall
b. at the ground
c. both

7) the period of a simple pendulum in a grandfather clock on another planet is 1.66s. what is the acceleration due to gravity on this planet? assume the length of the pendulum is 1.00m
 
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You will need to show us some work and list the equations you think are relevant to these problems before you can expect any help.