Pluto's density is 1.8 g/cm3 . Iron is about 5 g/cm3 . Rock is about is 3 g/cm3 . Ice or water is 1.0 g/cm3 . . This implies that
a. Pluto has a large iron-nickel core.
b. Pluto is about 50% water and 50% rocky material.
c. Pluto is all rock.
d. Pluto is all water or water ice.
B
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A rod (length = 2.0 m) is uniformly charged and has a total charge of 40 nC. What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
a. 40 N/C b. 45 N/C c. 24 N/C d. 90 N/C e. 36 N/C
The mass of an atom is
A) approximately equally divided between protons and electrons. B) approximately equally divided between neutrons, protons, and electrons. C) evenly divided between the nucleus and the surrounding electron cloud. D) concentrated in the cloud of electrons surrounding the nucleus. E) concentrated in the nucleus.
Temperature Scales: At what, if any, temperature are the numerical readings on the Fahrenheit and Celsius scales the same?
A. -30° B. -40° C. -50° D. -60° E. They can never read the same because they are based on different zeroes.
A white dwarf is
A) what most stars become when they die. B) a precursor to a black hole. C) an early stage of a neutron star. D) a brown dwarf that has exhausted its fuel for nuclear fusion.