Tensile Stress and Strain: Which one of the following is an accurate statement?
A. The ratio of tensile stress to tensile strain is called Young's modulus.
B. "Strain" has a meaning very close to "force."
C. "Stress" has a meaning very close to "stretch."
D. Tensile stress is measured in newtons.
E. Tensile strain is measured in meters.
Answer: A
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Compared with the efficiency of a typical steam-electric generating plant, the efficiency of a typical hydro-electric generating plant is
A) smaller because a steam-electric converts thermal energy into non-thermal forms and the second law of thermodynamics implies that this is a highly efficient process. B) smaller, because only a small amount of the energy in the water behind a dam can be converted into electricity. C) greater because a hydro-electric plant uses the sun as its source of energy, rather than hard-to-obtain fossil fuels. D) about the same, because both are heat engines and so both have the large inefficiency implied by the second law of thermodynamics. E) greater because a hydro-electric plant is not a heat engine and so it does not have the large inefficiency implied by the second law of thermodynamics.
Astronomical objects are viewed against the background of the ________
Fill in the blank(s) with correct word
Astronomers have discovered two black holes in the process of merging
Indicate whether the statement is true or false
The y-component of a force vector is -15.0N, while its magnitude is 27.2N. Which could be the vector’s direction?
A. 
below the +x axis
B. 
below the -x axis
C. 
below the -x axis
D. 
below the +x axis
E. None of the choices are correct.