The second law of thermodynamics holds that:
a. matter can neither be created nor destroyed
b. energy can neither be created nor destroyed
c. whenever energy is transformed to another form, some is dispersed
d. entropy decreases with time
e. energy is the capacity to do work
c
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Astronomers have found the center of the Universe to be located in
a. Earth b. the Sun c. Sagittarius A d. the Virgo Cluster of galaxies e. no center is thought to exist.
Collisions between galaxies tend to destroy, not create, stars
Indicate whether the statement is true or false
In which unit would it be best to state the dosage of radiation absorbed, with regard to its effects on humans?
a. Roentgens b. Curies c. Becquerels d. Rems
Your friend tells you that last night, they saw Mars high in the sky at midnight. You conclude that
A) Your friend must be mistaken: Mars can never be seen at midnight. B) Mars must be in retrograde. C) Mars must be at its closest distance from the Sun. D) Mars must be at its farthest distance from the Earth.