Question

A cat walks along a uniform plain that is 4 m long and has a mass of 7 kg the plank is supported by 2 saw horses one that is point 44 m from the left end of the plank the other is 1.5 m from the right end. When the cat reaches the very right end of the plank the plank starts to tip what is the cats mass​

Answer 1

2.3 kg

Step-by-step explanation:

The plank is uniform, so the center of mass is in the middle, 2 m from the right end. That means it's 0.5 m from the saw horse on the right.

Sum of the moments about the right saw horse:

∑τ = Iα

m (9.8 m/s²) (1.5 m) − (7 kg) (9.8 m/s²) (0.5 m) = 0

m = 2.3 kg