At what speed must a 150-kg football player be moving to have the same momentum as a 15.0-g bullet traveling at 300 m/s?
A)
10.0 m/s
B)
3.00 cm/s
C)
3.00 m/s
D)
30.0 m/s
E)
1.00 m/s
B
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A composite material is made from a 7075-T6 aluminum matrix with 50 % uniaxial alumina fibers. The yield strength of the aluminum is 500 MPa, and the elastic modulus is 70 GPa. The tensile strength of the alumina fibers is 1.4 GPa, and the elastic modulus is 380 GPa.
(a) Calculate the strain where the first change in elastic modulus occurs for this composite material in an axial tensile test. (b) Calculate the composite stress where the change in elastic modulus occurs.
What do the electron configurations for all the group 18 noble gases have in common?
A) They have the same number of electrons. B) They occupy the same number of shells. C) Their outermost occupied shells are filled to capacity. D) all of the above
Beyond the formation of iron, nuclear energy can be produced only by
A) fusion of still heavier elements. B) ionization of the radioactive nuclei. C) fission of heavy nuclei back toward lighter ones. D) gravity. E) the dark force.
Which of the following is (are) invariant(s)?
A. mass B. momentum C. energy D. the speed of light E. mass and the speed of light