The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does d represent?
A) the universal gravitational constant
B) the density of the smaller object
C) the distance between the two objects
D) the diameter of the larger object
C) the distance between the two objects
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Which of these events is NOT possible?
A) low-mass stars swelling up to produce planetary nebulae B) red giants exploding as Type II supernovae C) close binary stars producing recurrent novae explosions D) white dwarfs and companion stars producing recurrent Type I supernova events E) a white dwarf being found in the center of a planetary nebula
which of the following is true about science
a) In science knowledge is advanced by experiments which must be repeatable by competent observers b) In science once something is proven as a fact, it is a fact forever as science does not change in time c) A theory in science is just a guess about what is going on
Conduction: Two metal rods, one silver and the other gold, are attached to each other end-to-end. The free end of the silver rod is immersed in a steam chamber at 100°C, and the free end of the gold rod in an ice water bath at 0°C. The rods are both 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and their surroundings, except at the ends. How much total heat flows through the two rods each minute? The thermal conductivity of silver is 417 W/m ? K, and that of gold is 291 W/m ? K.
A. 8.2 kJ B. 9.5 kJ C. 12 kJ D. 14 kJ E. 16 kJ
A cloud fragment too small to form a star becomes:
A) a red giant. B) a black hole. C) a brown dwarf. D) a T Tauri object. E) a Herbig Haro object.