The oldest intact rocks found on Earth date back to approximately
A) 4.57 billion years ago
B) 3.85 billion years ago
C) 4.38 billion years ago
D) 4.02 billion years ago
D
Physics & Space Science
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A 4.00 kg hollow sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. The acceleration of the center of mass of the hollow sphere is
A. 2.00 
B. 2.22
C. 2.50
D. 2.64
E. 2.94
Physics & Space Science
Describe the various ways that stellar masses can be determined in binary star systems
What will be an ideal response?
Physics & Space Science
What is the direction of the electrostatic force on an electron placed at that point?
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD
Physics & Space Science
How many moles of H2 bonds are broken if you react nitrogen with hydrogen according to the following reaction?
N2 + 3H2 ? 2 NH3 A) 6 B) 2 C) 3 D) 1 E) 8
Physics & Space Science