The quantity Z in the expression 
must be
A. always greater than 1.
B. always less than 1.
C. It could be either greater than or less than 1.
C. It could be either greater than or less than 1.
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The observational evidence in favor of the existence of dark energy involves using ________ to calculate ________.
A. the method of standard candles; the distance to distant galaxies B. the method of inflation; the distance to distant galaxies C. Hubble's law; the distance to distant galaxies D. Hubble's law; the age of the Universe
A 40.0-g block of ice at -15.00°C is dropped into a calorimeter (of negligible heat capacity) containing water at 15.00°C
When equilibrium is reached, the final temperature is 8.00°C. How much water did the calorimeter contain initially? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg. A) 546 g B) 405 g C) 345 g D) 302 g E) 634 g
On any clear night, you can see 3 to 15 meteors per hour
a. True b. False Indicate whether the statement is true or false
The slope of a tangent line at a given time value on a position versus time graph gives
A) instantaneous velocity. B) average velocity. C) instantaneous acceleration. D) average acceleration E) none of the given answers.