The structural region of Earth that is a viscous liquid is the
a. mantle.
b. outer core.
c. inner core.
d. lithosphere.
b
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A certain chemical reaction has an activation energy of 
What temperature must the reaction be at for the reaction rate to be double the rate at 20
A. 290 K B. 310 K C. 330 K D. 350 K E. 360 K
Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them
By the time Arthur and Betty meet, what is Spot's displacement?
"For every action there is an equal and opposite reaction" is a statement of Newton's
a. law of universal gravitation. b. first law. c. second law. d. third law.
In a rollercoaster, provided losses of thermal energy because of friction can be neglected because:
a. the mechanical energy increases as the car moves to the top of the slope. b. the mechanical energy decreases as the car moves to the top of the slope. c. the gravitational potential energy decreases as the car moves to the top of the slope. d. the kinetic energy decreases as the car moves to the top of the slope. e. the rollercoaster moves at constant speed as its height above the ground increases.