Which of the following is true about the ages and masses of spiral and elliptical galaxies?
A) Ellipticals are all older and more massive than spirals.
B) Spirals are older, and much more massive than ellipticals.
C) Both types are about the same age, but spirals vary less in mass.
D) Spirals are younger and much more massive than any elliptical.
E) Ellipticals are older, and show a far wider range of masses than do spirals.
C
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Oxygen is the most common element in minerals in Earth's crust, which is why the release of gases from the crust over time has produced an atmosphere rich in oxygen today.
Answer the following statement true (T) or false (F)
A windowpane is half a centimeter thick and has an area of 1.10 m2 . The temperature difference between the inside and outside surfaces of the pane is 19.0 °C. What is the rate of heat flow through this window? (Thermal conductivity for glass is 0.840 J/s/m/°C.)
a. 7 020 J/s b. 3 510 J/s c. 4 180 J/s d. 1 850 J/s e. 2 200 J/s
A solid sphere, a solid cylinder, and a hoop all have the same mass and radius. Each are sent down identical inclined planes starting from rest. Their kinetic energies at the bottom of the incline are Ksphere, Kcylinder, and Khoop. Which of the following is true?
a. Ksphere > Kcylinder b. Khoop > Ksphere c. Khoop > Kcylinder d. Kcylinder > Khoop e. No answer above is correct.
A surface of erosion between rocks that represents a gap in Earth history is
A) called a dike. B) an unconformity. C) a faunal conformity. D) none of the above