The Ptolemaic model of the universe:
A) explained and predicted the motions of the planets with deferents and epicycles.
B) is the basis of our modern cosmology.
C) could not account for the stellar parallax observed by Hipparchus.
D) describes the orbits of the planets as being ellipses, not circles.
E) always kept Mars and Mercury between the Earth and Sun.
A
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A beam with an overhang is loaded by a uniform load of 3 kN/m over its entire length. Moment of iner- tia Iz 5 3.36 3 106 mm4 and distances to top and bottom of the beam cross section are 20 mm and 66.4 mm, respectively. It is known that reactions at A and B are 4.5 kN and 13.5 kN, respectively. The maximum bending stress in the beam is approximately:
(A) 36 MPa
(B) 67 MPa
(C) 102 MPa
(D) 119 MPa
According to current models, where does the element gold come from?
A) mergers of neutron stars B) the supernova explosions of high-mass stars C) the late stages of fusion in low-mass stars D) the Big Bang
One force acting on a falling apple is the apple's weight. Which of the following is the best description of the other member of the "force pair" [of which the apple's weight is one member]?
A) Gravity pulling downward on the apple. B) The force of gravity by Earth pulling upward on the apple. C) The force of gravity by the apple pulling upward on Earth. D) The force of gravity by the apple pushing downward on Earth. E) Air resistance acting upward on the apple.
A charged particle (mass = M, charge = Q> 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
A. QVB toward the east B. Zero C. QVB toward the west D. QVB upward E. QVB toward the south