Questions from Mechanics

Q: Plastic bar AB of rectangular cross section (b = 0.

Plastic bar AB of rectangular cross section (b = 0.75 in. and h = 1.5 in.) and length L = 2 ft is fixed at A and has a spring support (k = 18 kips/in.) at C (see figure). Initially, the bar and spring...

Q: A compression bar having a square cross section with sides 50 b

A compression bar having a square cross section with sides 50 b 5 mm is subjected to load P. The bar is constructed from two pieces of wood that are connected by a glued joint along plane pq that is i...

Q: A small lab scale has a rigid L-shaped frame ABC

A small lab scale has a rigid L-shaped frame ABC consisting of a horizontal arm AB (length b = 10 in.) and a vertical arm BC (length c = 7 in.) pivoted at point B. The pivot is attached to the outer f...

Q: A small lab scale has a rigid L-shaped frame ABC

A small lab scale has a rigid L-shaped frame ABC consisting of a horizontal arm AB (length b = 30 cm) and a vertical arm BC (length c = 20 cm) pivoted at point B. The pivot is attached to the outer fr...

Q: Two rigid bars are connected to each other by two linearly elastic

Two rigid bars are connected to each other by two linearly elastic springs. Before loads are applied, the lengths of the springs are such that the bars are parallel and the springs are without stress....

Q: A short length of a C 200 × 17.1 channel

A short length of a C 200 × 17.1 channel is subjected to an axial compressive force P that has its line of action through the midpoint of the web of the channel (see figure part a). (a) D...

Q: The three-bar truss ABC shown in the figure part a

The three-bar truss ABC shown in the figure part a has a span L = 3 m and is constructed of steel pipes having a cross-sectional area A = 3900 mm2 and modulus of elasticity E = 200 GPa. Identical load...

Q: An aluminum wire having a diameter d = 1/10 in

An aluminum wire having a diameter d = 1/10 in and length L = 12 ft is subjected to a tensile load P (see figure). The aluminum has a modulus of elasticity E = 10,600 ksi If the maximum permissible el...

Q: A uniform bar AB of weight W = 25 N is supported

A uniform bar AB of weight W = 25 N is supported by two springs, as shown in the figure. The spring on the left has a stiffness k1 = 300 N/m and natural length L1 = 250 mm. The corresponding quantitie...

Q: A hollow, circular, cast-iron pipe (Ec =

A hollow, circular, cast-iron pipe (Ec = 12,000 ksi) supports a brass rod (Eb = 1 4,000 ksi) and weight W = 2 kips, as shown. The outside diameter of the pipe is dc = 6 in. (a) If the allowable compre...