A bracket with pulleys for positioning magnetic tape in an electronic data storage de­vice...

A bracket with pulleys for positioning magnetic tape in an electronic data storage de­vice is shown. The pulleys are frictionless. the tape supports a force T = 2 N. and the thickness of the tape can be neglected.

(a) Use the two tape forces in Fig. P4.48(a) to compute the resultant couple moment.

(b) Replace the forces on the two pulleys with point forces on the pinions as shown in Fig. P4.48(b). and compute the resultant couple moment (replacement of pulley forces by bearing forces is discussed in Chapter 3 in connection with Fig. 3.9).

Figure P4.48