1.A load P is supported by two concentric steel springs arranged as shown. The inner spring consists of 30 turns of 20 mm. diameter wire on a mean diameter of 150 mm. The outer spring has 20 turns of 30 mm. wire on a mean diameter of 200 mm. Compute the maximum load and minimum load in the inner spring that will not exceed a shearing stress of 140 MPa in either spring. Use G = 83 GPa.

1.A load P is supported by two concentric steel springs arranged as shown. The inner spring consists of 30 turns of 20 mm. diameter wire on a mean diameter of 150 mm. The outer spring has 20 turns of 30 mm. wire on a mean diameter of 200 mm. Compute the maximum load and minimum load in the inner spring that will not exceed a shearing stress of 140 MPa in either spring. Use G = 83 GPa.

Group of answer choices

2154 N

6904 N

9058 N

8810 N

2. What is the maximum shearing stress developed a solid steel shaft is subjected to a torque of 28 kN.m. The shaft will not twist through more than 10 degrees in a 6 m length ?Use G=83 GPa.

58.85 MPa

125.864 MPa

43.4 MPa

3. Calculate the maximum shearing stress developed in a phosphor bronze spring having mean diameter of 150 mm and consisting of 24 turns of 10-mm diameter wire when the spring is stretched 180mm. Use A.M. Wahl’s formula and G=42 GPa.

Group of answer choices

24.336 MPa

12.233 MPa

36.689 MPa

48.778 MPa

EXPERT ANSWER