The balance wheel of a watch oscillates with angular amplitude rad and period 0.41 s. Find (a) the maximum angular speed of the wheel, (b) the angular speed of the wheel at displacement rad, and (c) the magnitude of the angular acceleration at displacement

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)