Which publication was Kepler's masterpiece, providing strong evidence to planetary motion and a heliocentric Universe?
a. Alfonsine Tables
b. De Revolutionibus
c. Rudolphine Tables
d. The Prutenic Tables
e. Sidereus Nuncius
c
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Suppose you stretch a rubber band. The work you do on the rubber band is
A. positive. B. negative. C. zero.
A spaceship from another galaxy passes over the solar system directly above a radial line from the Sun to the Earth. (We measure that distance to be 1.5 × 1011 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80c, for which ? = 5/3. As measured on Earth it takes the spaceship 625 seconds to travel from the Sun to Earth. When a scientist in the spaceship measures the Earth-Sun distance and the time it takes her to travel that distance, she finds the results are, respectively
A. 9.0 × 1010 m; 375 s. B. 9.0 × 1010 m; 625 s. C. 1.5 × 1011 m; 625 s. D. 2.5 × 1011 m; 625 s. E. 2.5 × 1011 m; 1042 s.
A steel bolt (area 5 130 mm2, Es 5 210 GPa) is enclosed by a copper tube (length 5 0.5 m, area 5 400 mm2, Ec 5 110 GPa) and the end nut is turned until it is just snug. The pitch of the bolt threads is 1.25 mm. The bolt is now tightened by a quarter turn of the nut. The resulting stress in the bolt is approximately:
(A) 56 MPa
(B) 62 MPa
(C) 74 MPa
(D) 81 MPa
Interaction partners
A. are equal in magnitude and opposite in direction and act on the same object. B. are equal in magnitude and opposite in direction and act on different objects. C. appear in a free-body diagram for a given object. D. always involve gravitational force as one partner. E. act in the same direction on the same object.