A sunspot maximum occurred in the year 2015. If the solar cycle continues, the year of the sunspot maximum that immediately follows the 2015 cycle maximum will be _____
A) 2026
B) 2020
C) 2016
D) 2030
A
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Study this H-R diagram. Which of the following stars is the largest in size (radius)? (The red arrows help you locate these stars on the diagram.)
A) Antares B) Canopus C) Alpha Centauri B D) Aldebaran
If you float a piece of wood in a container half-full of water that rests on a weighing scale, the weight reading on the scale will
A) decrease. B) remain unchanged. C) increase.
Which of the following books of tabulated predicted planet positions was not based on uniform circular motion?
a. the Rudolphine Tables by Kepler b. the Prutenic Tables based on Copernicus' model c. the Alphonsine Tables based on Ptolemy's observations and calculations
A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1