If an object is stretched beyond the elastic limit, it enters the _______ on an applied force versus elongation graph for a typical metal
A)
elastic region
B)
proportional region
C)
plastic region
D)
ultimate strength region
E)
breaking region
C
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The torque due to the frictional resistance of the oil film between a rotating shaft and its bearing is found to be dependent on the force F normal to the shaft, the speed of rotation N of the shaft, the dynamic viscosity ? of the oil, and the shaft diameter D. Establish a correlation among the variables by using dimensional analysis.
GIVEN The oil film between a rotating shaft and its bearing The torque (T) due to frictional resistance is a function of normal force (F), speed of rotation (N), dynamic viscosity (?), and shaft diameter (D) FIND A correlation among the variables ASSUMPTIONS Steady state
The cosmological redshift is actually not a velocity at all, but a measure of the expansion of space-time
Indicate whether the statement is true or false
What is shown by the small-scale changes in the shading in the figure above?
A) variations in the temperature of the photosphere B) variations in the height of the solar surface C) vibrations seen at the solar surface D) Nothing; this is an artist's rendering of the sun.
Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which step does the entropy of the system increase?
a. 1 b. 2 c. 3 d. 4