A disk of radius 25 cm spinning at a rate of 30 rpm slows to a stop over 3 seconds. what is the angular acceleration? b. how many radians did the disk turn while stopping?
c. how many revolutions?​

α = -π/3 rad/s², θ = 1.5π rad = 0.75 rev

Explanation:

ω₀ = 30 rev/min(2π rad/rev / 60 s/min) = π rad/s

α = (ω₁ - ω₀)/t = (0 - π)/3 = -π/3 rad/s²

θ = (ω₁² - ω₀²) / 2α = (0² - π²) / 2(-π/3) = 3π/2 rad

3π/2 rad / 2π rad/rev = 0.75 rev

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary