Arotating object starts from rest at t = 0 s and has a constant angular acceleration. at a time of t = 7.0 s the object has an angular velocity of ω = 15 rad/s. what is its angular velocity at a time of t = 14 s?

angular velocity at t=14-s is w = 29.98-rad/s

Explanation:

for constant angular acceleration,

∝ = Δw / Δt Δ = (w-wi)/(t-ti)

∝ = 15 - 0 / 7 - 0

∝ = 2.14-rad/s²

now again applying formula,

∝ = Δw / Δt Δ = (w-wi)/(t-ti)

w = (t-ti)∝+wi

w = (14 - 7)(2.14) + 15

w = 29.98-rad/s

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it