Answer:
Before the plank will tip cat will walk 1.652 m
Explanation:
Mass of the cat along with plank 
Center of mass of the plank 
Mass of cat 
We have to find how far right of sawhorse B.
Plank will tip when weight of the cat about B is greater than the torque by the weight of the plank.
Balancing the the torque



Answer:
150J
Explanation:
work output/work input=100%
so just make work output the subject
Answer:
L = 4.711 *10^{-6} kg m2/s
Explanation:


=4.5*10^-5
angular velocity

= 0.1047 rad/s
the angular momentum,



Area near a sea having flat land and low relief