FQ1 - DEFORMA

What is the modulus of elasticity if the stress is 44,000 psi and unit strain of 0.00105?

• 41.905 x 10⁶

• 42.300 x 10⁶

• 41.202 x 10⁶

• 43.101 x 10⁶

A 30-m long aluminum bar is subjected to a tensile stress of 172 MPa. Find the elongation if E = 69.116 MPa.

• 0.746 m

• 0.007 m

• 6.270 mm

• 7.46 cm

A steel wire is 4.0 m long and 2 mm in diameter. How much is it elongated by a suspended body of mass 20 kg? Young’s modulus for steel is 196,000 MPa.

• 1.123 mm

• 1.274 mm

• 1.385 mm

• 1.374 mm

A steel wire is 6 m long, hanging vertically supports a load of 2000 N. Neglecting the weight of the wire, determine the required diameter if the stress is not to exceed 140 MPa and the total elongation is not to exceed 4 mm. E = 200,000 MPa

• 4.4 mm

• 3.4 mm

• 4.26 mm

• 5.4 mm

A copper rolled wire 10 m long and 1.5 mm diameter when supporting a weight of 350 N elongates 18.6 mm. Compute the value of the Young’s modulus of this wire.

• 106.48 GPa

• 200 GPa

• 180.32 GPa

• 148.9 GPa

A cylinder of diameter 1.0 cm at 30°C is to be slid into a hole on a steel plate. The hole has a diameter of 0.099970 cm at 30°C. To what temperature the plate must be heated? Coefficient of linear expansion for steel is cm/°C.

• 55°C

• 62°C

• 65°C

• 48°C

An iron steam pipe is 200 ft long at 0°C. What will its increase in length when heated to 100°C? Coefficient of linear expansion is ft/°C.

• 0.20 ft

• 0.28 ft

• 0.12 ft

• 0.18 ft

From the figure as shown, determine the total elongation of the composite body carrying a tensile load of 5 kN. Assume E₁ = 10 MPa and E₂ = 15 MPa.

• 120 mm

• 118 mm

• 112 mm

• 108 mm

A steel railroad rails 10 m long are laid with clearance of 3 mm at a temperature of 15ᵒC. At what temperature will the rails just touch? If there were no initial clearance, assume: alpha = 11.7 micro m/m deg. C and E = 200 GPa

• 46.90 deg

• 56.06 deg

• 50.36 deg

• 40.64 deg

A certain steel tape is known to be 100,000 ft long at a temperature of 70ᵒF. When the tape is at a temperature of 10ᵒF, what tape reading corresponds to a distance of 90,000 ft? Assume a coefficient of thermal expansion equal to per ᵒF.

• 90.035 ft

• 89.965 ft

• 90.225 ft

• 89.775 ft