The cosmological principle states that the universe is I. expanding. II. accelerating. III. homogeneous. IV. isotropic
a. I and II
b. III and IV
c. I and III
d. II and IV
e. I, II, III, and IV
B
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A simply supported laminated beam of length L 5 0.5 m and square cross section weighs 4.8 N. Three strips are glued together to form the beam, with the allowable shear stress in the glued joint equal to 0.3 MPa. Considering also the weight of the beam, the maximum load P that can be applied at L/3 from the left support is approximately:
(A) 240 N
(B) 360 N
(C) 434 N
(D) 510 N
What happens when a particle of matter meets its corresponding antiparticle of antimatter?
A) The combined mass of the two particles is completely transformed into energy (photons). B) They can form a complete atom. C) They fuse to make a heavier particle. D) The question makes no sense, because antimatter does not really exist.
Which of the following layers of the Earth is unique among the terrestrial planets?
A) hydrosphere B) ionosphere C) mantle D) crust E) core
If you strip electrons from an atom, the atom becomes a
A) positive ion. B) negative ion. C) different element.