How many times smaller are the tiniest particles that we know about than the size of the Earth?
A. about 1025 times smaller
B. about 10 times smaller
C. about 1000 times smaller
D. about 100 million times smaller
E. about 1 million times smaller
Ans: A. about 1025 times smaller
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Find the force (magnitude and direction) exerted on an electron moving vertically upward at a speed of 
m/s by a horizontal magnetic field of 0.50 T directed north.
a. 
b. 
c. 
d. 
A 72 nC charge is located at x = 3.00 m on the x-axis and an 8.0 nC charge is located at x = 7.0 m. At what point on the x-axis is the electric field zero?
A. - 9.0 m B. 4.0 m C. -5.0 m D. 6.0 m E. 6.3 m
The ground state of the Li++ ion is at (Li has atomic number 3)
A) -40.8 eV. B) -122 eV. C) Li++ does not have a ground state. D) -61 eV. E) -1.51 eV.
Our Sun is considered to be a(n) ________
A) brown dwarf B) low-mass star C) high-mass star D) intermediate-mass star