a ductile hot-rolled steel bar has a minimum yield strength in tension and compression of 350 mpa. using the distortion-energy and maximum-shear-stress theories, determine the factors of safety for the following plane stress states.

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.