Question

Problem 9.25 8 of 19 A 1.5- metal cylinder on a table is placed inside a hoop that is xed at the end of a meter sick. The stick can rotate around a vertical is that is located 20 cm from the cylinder as shown in Figure 1). By exerting a force on the stick, you can make the cylinder rotate in a horizont plane, with the bottom surface of the cylinder Sliding on the rough table. The coefficient of kinetic friction between the cylinder and the table is 0.30. Review Constants Periodic Table Determine the magnitude of the force that you need to exert on the end of the stick (perpendicular lo it so that the cylinder moves with a constant speed Express your answer with the appropriate units. HA Os ? F. Value Units Figure 1 of 1 > Submit Previous Answers Beavest Answer X Incorrect; Try Again: 2 attempts remaining Part B Determine the work done by your hand on the stick while your hand makes one fulfur wound the Express your answer with the appropriate units TELL

Answer 1

A)
let m = 1.5 kg
mue_k = 0.3
normal force acting on the cyllinder, N = m*g
kinetic friction acting on the cyllinder, fk = N*mue_k

= m*g*mue_k

= 1.5*9.8*0.3

= 4.41 N

let F is the applied force, F*80 = fk*20

F = fk*20/80

= fk/4

= 4.41/4

= 1.10 N <<<<<<<<---------------Answer

B) Work done by hand, W = F*2*pi*r

= 1.10*2*pi*0.8

= 5.53 J <<<<<<<<---------------Answer