A heat engine operating at maximum efficiency has an efficiency of 35.0%. The temperature of the hot reservoir is 700 K. What is the temperature of the cold reservoir?
A) 200 K
B) 245 K
C) 350 K
D) 455 K
E) 600 K
D
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Carbon-14 Dating: How many protons, neutrons, and nucleons are there in a carbon-14 nucleus?
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According to our basic scenario of solar system formation, why do the jovian planets have numerous large moons?
A) As the growing jovian planets captured gas from the solar nebula, the gas formed swirling disks around them, and moons formed from condensation accretion within these disks. B) Because of their strong gravity, the jovian planets were able to capture numerous asteroids that happened to be passing nearby, and these became the major moons of the jovian planets. C) The large moons of the jovian planets originally formed in the inner solar system and these moons then migrated out to join up with the jovian planets. D) The many moons of the jovian planets remains one of the unexplained mysteries of the formation of our solar system.
A projectile is shot horizontally at 23.4 m/s from the roof of a building 55.0 m tall. (a) Determine the time necessary for the projectile to reach the ground below
(b) Determine the distance from the base of the building that the projectile lands. (c) Determine the horizontal and vertical components of the velocity just before the projectile reaches the ground.
What is the cause of Jupiter's slight flattening, which results in an equatorial diameter 6% greater than its polar diameter?
A) its rapid spin cycle B) its massive gravitational pull C) nuclear fission within its core D) its frequent reversal of its magnetic poles