The sun has a core in which energy travels outward primarily by radiation
Indicate whether the statement is true or false
T
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What might explain how the core formed?
A. the magnetic field pulling it inward B. asteroids hitting and penetrating C. iron sinking to the core as the bulk of Earth melted D. Earthquakes shake the planet and the iron gradually "sifts" downward. E. The silicon of the crust decays into iron at high temperatures.
A car accelerates from to at a rate of How far does the car travel while accelerating?
A) 80.0 m B) 133 m C) 226 m D) 399 m
How are elements beyond iron formed in massive-star supernovae?
A) Elements thrown out at high speeds fuse with hydrogen atoms in the interstellar medium. B) Neutrons produced during the core collapse are slammed into atomic nuclei. C) The high temperature and pressure allow iron nuclei to fuse.
Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
a. their changes in momentum. b. the force each exerts on the other. c. their changes in kinetic energy. d. all of the above. e. only (a) and (b) above.