When a force is called a "normal" force, it is
A. the usual force expected given the arrangement of a system.
B. a force that is perpendicular to the surface of the Earth at any given location.
C. a force that is always vertical.
D. a contact force perpendicular to the contact surfaces between two solid objects.
E. the net force acting on a system.
D. a contact force perpendicular to the contact surfaces between two solid objects.
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Our Solar System formed 14 billion years ago with the Big Bang
a. True b. False Indicate whether the statement is true or false
The proper motion of a star, its distance, and Doppler shift can give us its space velocity
Indicate whether the statement is true or false
The simplest member of the aromatic hydrocarbons is named ______________
Fill in the blank(s) with correct word
A neutral atom always has
A) more neutrons than protons. B) more neutrons than electrons. C) more protons than electrons. D) the same number of neutrons as protons. E) the same number of protons as electrons.