When there is a net release of energy in a chemical reaction, it is called a(n) ______________ reaction
a. exothermic
b. activation
c. endothermic
d. combustion
a
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Edwin Hubble and Milton Humason discovered that there was a linear relationship between a galaxy's ____
a. rotation curve and distance b. mass and luminosity c. age and distance d. apparent recession velocity and distance e. mass and recession velocity
How many basic units does the SI system have?
A) three B) four C) five D) seven E) ten
The diagram below illustrates two stars in a visual binary system and the center of mass of this system. Based on this diagram, what is the ratio of the mass of star A to the mass of star B?
a. 2 to 1
b. 1 to 2
c. 2 to 3
d. 3 to 2
e. 1 to 3
Kirchhoff's Rules: A multiloop circuit is shown in the figure, but some quantities are not labeled. Find the emf ? if the batteries are ideal. (It is not necessary to solve the entire circuit.)
A. +3 V B. +19 V C. -3 V D. -10 V E. -19 V