The rings of Uranus were discovered when it passed in front of a star, and the dark rings occulted the star several times for brief intervals
Indicate whether the statement is true or false
TRUE
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A 0.42-kg quantity of ethanol, in the liquid state at its melting point of -114.4°C, is frozen at atmospheric pressure. The heat of fusion of ethanol is 1.04 × 105 J/kg, and its molecular mass is 46.1 g/mol
What is the change in the entropy of the ethanol as it freezes? A) 280 J/K B) -280 J/K C) -310 J/K D) 250 J/K E) -250 J/K
The special theory of relativity was developed
A) almost in its entirety by Max Planck. B) almost in its entirety by Albert Einstein. C) almost in its entirety by Erwin Schroedinger. D) in its entirety by Planck, Schroedinger, and Einstein. E) by Planck, Schroedinger, Einstein, and many other scientists.
A puck with a mass m1 = 50 g moving at 1.0 m/s approaches a stationary puck with a mass m2 = 100 g on a frictionless air table, and they undergo a sudden two-dimensional elastic collision
After the collision, both pucks have identical speeds, but travel in different directions. What is the angle between the original and final paths of puck with mass m1? A) 30° B) 60° C) 90° D) 120° E) 150°
Given the differences in size and composition of the jovian planets in our solar system, how many groups is it appropriate to sort them into?
A) one B) two C) three D) four