If the Q value of an endothermic reaction is –2.17 MeV, then the minimum kinetic energy needed in the reactant nuclei if the reaction is to occur must be
1.equal to 2.17 MeV.
2.greater than 2.17 MeV.
3.less than 2.17 MeV.
4.exactly half of 2.17 MeV.
2
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Observations of type Ia supernovae reveal that the expansion of the universe is speeding up because of the presence of ___________ in empty space
Fill in the blank(s) with correct word
An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?
a. 1 b. 2 c. 1/2 d. 1/4 e. -2
In the above cartoon image of Orion, where would you find the Orion nebula?
a. below the belt (i.e., three white stars) but above the lower right blue and lower left white stars
b. above the belt (i.e., three white stars) but below the upper red and the upper white stars
c. in the belt, that is, among the three white stars
d. outside the white lines
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
?
Exhibit 3-3
The vectors 
and 
are shown below.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 3-3. Which diagram below correctly represents 
?
A.
B.
C.
D.
E.
