When an earthquake occurs, the point of initial energy release is called the earthquake's ______________
a. epicenter
b. fault line
c. focus
d. none of the above
c
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Why does a high-mass star evolve differently from a low-mass star?
A. It has more material to burn so it can last longer. B. It is so bright that it drives material in space away from it so it can't gather up more fuel. C. It has a lower gravity so it can't pull in more fuel from space. D. It can fuse additional elements because its core can get hotter. E. The statement is false. High and low-mass stars evolve the same way.
100 grams of molten lead (600°C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21°C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g×°C; the latent heat of fusion and the melting point of lead are 2.45 × 10^4 J/kg and 327°C.)
a. -145 b. -252 c. -302 d. -429 e. -100
Which of the following does not yield information on jovian planet interiors?
A) Earth-based observations of the mass and size of the planets B) spacecraft measurements of magnetic and gravitational fields C) laboratory studies and theoretical models D) spectroscopy of the cloud layers E) detailed observations of planetary shapes
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N b. 200 N c. 98 N d. 49 N e. Some value other than those given above.