The centroid of the assemblage of lines shown in the figure below is at coordinates (x, y, z):
(A) 3, 0.9, 0.4
(B) 4, 1.5, 2
(C) 3, 2, 1
(D) 2.4, 3, 1.4
(A) 3, 0.9, 0.4
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A machine part consists of 0.10 kg of iron (of specific heat 470 J/kg ? K ) and 0.16 kg of copper (of specific heat 390 J/kg ? K). How much thermal energy must be added to the gear to raise its temperature from 18°C to 53°C?
A) 910 J B) 3800 J C) 4000 J D) 4400 J
If the material for life were introduced from space after the Earth formed, a major carrier would have been:
A) the solar wind. B) tektites from the Moon. C) comet impacts. D) encounters with other solar systems. E) iron meteorites.
Herbig-Haro objects are extra solar planets
Indicate whether the statement is true or false
What causes the geological activity seen on some of the inner moons of Jupiter?
a. Constant collisions with space debris provide a power source for geological activity. b. The strong magnetic field of Jupiter heats the surface of the inner moons. c. Tidal friction as a result of being so close Jupiter heats their interiors. d. Solar radiation reflected of Jupiter's surface provides a power source for geological activity.