The critical resolved shear stress for high-purity FCC copper is 0.63 MPa. A polycrystalline tensile test specimen is made from this copper material. What is the predicted tensile proportional limit stress for this specimen?
What will be an ideal response?
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Atmospheric pressure is 1.00 × 10^5 N/m2, and the density of air is 1.29 kg/m3 . If the density of air is constant as you get higher and higher, calculate the height of the atmosphere needed to produce this pressure
a. 1 260 m b. 77 000 m c. 7 900 m d. 10 300 m
If an object's orbital velocity exceeds a celestial object's escape velocity, the object will follow closed orbits
a. True b. False Indicate whether the statement is true or false
Kinetic energy is conserved in
a. an inelastic collision. b. an elastic collision. c. any collision where two objects rebound off each other. d. none of the above.
A hot air balloon along with its cargo has a mass of 4.0 x 105 kg, and it holds 7.0 x 105 m3 of hot air. It is floating at a constant height in air with a density of 1.29 kg/m3. What is the density of the hot air in the balloon?
A) 1.4 kg/m3 B) 0.72 kg/m3 C) 0.57 kg/m3 D) 0.86 kg/m3 E) 0.43 kg/m3