The central core inside an atom is the neutron
a. True
b. False
Indicate whether the statement is true or false
False
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The place in a planet's orbit that is closest to the Sun is called:
A) vernal equinox. B) aphelion. C) perihelion. D) crossing the ecliptic. E) None of these; a planet's distance from the Sun never changes.
A photoheterotroph gets its energy from
A) chemical reactions and its carbon from other organisms B) the Sun and its carbon from other organisms C) the Sun and its carbon from its environment D) chemical reactions and its carbon from its environment
The average velocity of a car traveling with a constant acceleration during a certain time interval is equal to the mean of the velocities at the beginning and end of that time interval
Indicate whether the statement is true or false
Torque: Two forces produce equal torques on a door about the door hinge. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force has a greater magnitude?
A. the first force (at the midpoint) B. the second force (at the doorknob) C. The two forces are equal.