Deck 3: Equilibrium of Particles and Rigid Bodies: 2D, 3D

Question 1

pin at A in Problem 3.7 is removed and the pole rests on a rough surface at A in the position shown in the figure below. The minimum coefficient of friction at A required for equilibrium is:
(A) 0.41
(B) 0.25
(C) 0.37
(D) 0.64

Answer 1

A

Question 2

cable and frictionless pulley system at D is used to bring a 230-kg pole (ACB) to a vertical position as shown in the figure. The cable has tensile force T and is attached at C. The reaction force components, and , at A (in newtons) are:
(A) 3102, 21270
(B) 21270, 3102
(C) 21342, 4214
(D) 23102, 4204

Answer 2

B

Question 3

Trusses and frames
(A) 0.19
(B) 0.33
(C) 0.68
(D) 0.24

Answer 3

D

Question 4

reaction force at C (lb) for the beam below is:
(A) 675 lb
(B) 985 lb
(C) 775 lb
(D) 525 lb

Question 5

cylinders are in contact along an inclined plane. The upper cylinder (weight is 2.5W) rests against
(A) 1.75W
(B) 3.5W
(C) 1.57W
(D) 2.01W

Question 6

(A) 75, 130
(B) 130, 75
(C) 125, 150
(D) 75, 120

Question 7

coefficient of friction between a block and the plane is 0.25 (see figure). The minimum horizontal force F (in newtons) required to cause the block to slide up the plane is:
(A) 827
(B) 714
(C) 609
(D) 522

Question 8

y-direction force on frame ABCDEF below acts at the center of the bar segment to which it is applied. Support B is restrained against translation in the directions only, and support C is restrained in the direc-
Tion only. Support D is a pin support. Equilibrium of the frame requires that reaction force is (in newtons):
(A) 80.8 N
(B) 67.7 N
(C) 14.8 N
(D) 92.2 N

Question 9

Force F required to hold the 75-lb weight in equilibrium is:
(A) 37.50 lb
(B) 18.75 lb
(C) 56.25 lb
(D) 25.0 lb

Question 10

contact force F between the two cylinders in Problem 3.3 may be expressed in terms of load variable W as:
(A) 1.82W
(B) 2.5W
(C) 2.1W
(D) 1.52W

Question 11

An adjustable bracket with a collar slides on a pole and is held in place by friction at A and B. The min- imum coefficient of static friction between the pole and collar so that the collar is self-locking against the pole
Under applied load F is:
(A) 0.25
(B) 0.31
(C) 0.42
(D) 0.83