【单选题】The two homogeneous rings in Figs. (a) and (d) and the two homogeneous disks in Figs. (b) and (c) have the same weight【图片】 and radius 【图片】. Force【图片】 is applied in Figs. (a) and (b). A moment【图片】 is a...
A.
The angular acceleration of the ring in Fig. (a) is equal to that of the disk in Fig. (b).
B.
The angular acceleration of the ring in Fig. (a) is equal to that of the disk in Fig. (c).
C.
The angular acceleration of the ring in Fig. (a) is equal to that of the ring in Fig. (d).
D.
The angular acceleration of the disk in Fig. (b) is equal to that of the ring in Fig. (d).
【简答题】A fireboat-pump delivers water to a vertical nozzle with a 3:1 diameter ratio, as in Fig. If friction is neglected and the flow rate is 0.02 m 3 /s, how high will the outlet water jet rise?