In the vacuum of space, one gets rid of unwanted heat from spacecraft by utilizing
A) evaporation.
B) convection.
C) radiation.
D) conduction.
C
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Which equation represents the overall nuclear fusion process of the Sun?
a. 4H => 8He + energy b. 2 1H => 1He + energy c. 4 1H => 2 1He – energy d. 4 1H => 4He + energy e. 4 4H => 4He – energy
Energy Levels: What is the ground state energy of the Li++ ion, which has atomic number 3?
A. -40.8 eV B. -122 eV C. -61 eV D. -1.51 eV E. Li++ does not have a ground state.
The heavier elements like iron and nickel are abundant on Earth's surface, and the silicates dominate at the center of Earth.
Answer the following statement true (T) or false (F)
Planes traveling between Seattle and Tokyo often go near Alaska because
A) the distance is shorter. B) there is less air traffic to contend with. C) planes travel faster in cooler air. D) the plane can stay over the safety of land for longer.