Asolid cylinder with a radius of 73.3 cm and a mass of 2.33 kg accelerates
uniformly from rest in 4.13 seconds while experiencing 6.71 rotations.
solve for the (a) final angular velocity.
- solve for the (b) the torque required to produce the angular acceleration.

(a) 20.4 rad/s

(b) 3.09 Nm

Explanation:

Given:

Δθ = 6.71 rev = 42.2 rad

ω₀ = 0 rad/s

t = 4.13 s

Find: ω

Δθ = ½ (ω + ω₀) t

42.2 rad = ½ (ω + 0 rad/s) (4.13 s)

ω = 20.4 rad/s

Find: α

Δθ = ω₀ t + ½ αt²

42.2 rad = (0 rad/s) (4.13 s) + ½ α (4.13 s)²

α = 4.94 rad/s²

∑τ = Iα

τ = ½ m r² α

τ = ½ (2.33 kg) (0.733 m)² (4.94 rad/s²)

τ = 3.09 Nm

does it have any answear choices.

explanation:

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.