The spacecraft is revolving about its z-axis, which has a fixed space orientation, at th...

The spacecraft is revolving about its z-axis, which has a fixed space orientation, at the constant rate Simultaneously, its solar panels are unfolding at the rate which is programmed to vary with β as shown in the graph. Determine the angular acceleration α of panel A an instant (a) before and an instant (b) after it reaches the position β = 18°.