Answer:
2) τ = F x torque increases, 3) troque decreases,
4) man approaches the pivot and the child must move away
5) Σ τ = 0
Explanation:
2) when the man moves away from the pivot his torque increases significantly, since his distance increases
τ = F x
τ = m g x
therefore the system rotates faster
3) when the child approaches the pivot, his troque decreases, because the distance decreases
τ = f x
therefore the system must spin slower
4) If we place the man and the child on the side of a scale, the movement must be the man approaches the pivot and the child must move away, so that the torque is the same and the system can reach a balance
5) the rotational equilibrium expression
Σ τ = 0
is the one that describes the equilibrium of a system with several forces
<span>Speed of the sphere = 7 m/s
Distance between center of the circle to the center of the sphere = 1.8 m
Mass of the sphere = 6kg
Radius of the sphere = 0.89 m
Angular speed w = 5.62
Rotational kinetic energy of the sphere = 1/2 I x w^2
I being the moment of inertia, w being the angular speed
I = (2/5) x M x R^2 = (2/5) x 6 x 0.89^2 = 1.90
Rotational kinetic energy = 1/2 x 1.9 x 5.62^2 = 30 J</span>
We wouldn’t really have a solid concept of time. We also wouldn’t be able to keep up with the tides
Average velocity = distance divided by time
Distance = 180
Time = 3 hours
180 / 3 = 60 m/s