The discovery of dark energy increased support for the ________ universe
A) flat B) toroidal C) cylindrical D) hyperbolic E) spherical
A
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At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. they coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point
If you walk toward a mirror at a certain speed, the relative speed between you and your image is
A) half your speed. B) your speed. C) twice your speed. D) none of the above
Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.6 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 7.2 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is given up by 2.80 kg of this substance when it is cooled from 170°C to 86°C at a pressure of one atmosphere?
A. 400 kJ B. 200 kJ C. 300 kJ D. 440 kJ E. 640 kJ
The appearance of _________coalescence on the fracture surface indicates a ductile metal with high energy absorption.
Fill in the blank(s) with the appropriate word(s).