The Cenozoic era began about how many million years ago?
a. 65
b. 545
c. 3
d. 245
a
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Quantum mechanics is
A) a branch of physics that applies on very small scales. B) the idea that mechanics can be understood only if we first understand quantums. C) the idea that quantitative methods are needed to understand physics. D) a branch of physics that deals with the curvature of spacetime. E) a branch of physics that deals with the properties of gases.
A nonprismatic cantilever beam of one material is subjected to load P at its free end. Moment of inertia I2 5 2I1. The ratio r of the deflection ?B to the deflection ?1 at the free end of a prismatic cantilever with moment of inertia I1 carrying the same load is approximately:
(A) 0.25
(B) 0.40
(C) 0.56
(D) 0.78
Which of these are the flavors of quarks?
a. Spin, and strangeness, and force they participate in. b. Charge, mass, and kinetic energy. c. Up, down, strange, charm, bottom, and top. d. Up, down, and strange. e. Neutron, proton, and electron.