The energy levels for electrons vary from one element to another
Indicate whether the statement is true or false
TRUE
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The symbol indicating the mass number of a nucleus is __________
Fill in the blank(s) with correct word
Jovian worlds that orbit close to their host stars are called ____________
Fill in the blank(s) with correct word
Components: The eastward component of vector 
is equal to the westward component of vector 
and their northward components are equal. Which one of the following statements must be correct for these two vectors?
A. Vector 
is parallel to vector 
.
B. Vector 
is antiparallel (in the opposite direction) to vector 
.
C. Vector 
must be perpendicular to vector 
.
D. The magnitude of vector 
must be equal to the magnitude of vector 
.
E. The angle between vector 
and vector 
must be 90°.
If M = 2.0 kg, what is the tension in string 1?
A. 1.2 N B. 11 N C. 34 N D. 3.5 N E. 40 N