Support reaction Gy in the frame below is:
(A) 1.83P
(B) 2.05P
(C) 2.75P
(D) 21.77P
(A) 1.83P
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When Copernicus first created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model. Why not?
What will be an ideal response?
A diver, below the surface of a lake, notices that no light appears to be coming toward her greater than the angle 
measured from the vertical. If the index of refraction of water is 1.33, what is the angle 
A. 
B. 
C. 
D. 
E. 
On its own, a certain tow-truck has a maximum acceleration of 3.0 m/s2. What would be the maximum acceleration when this truck was towing a bus of twice its own mass?
A) 2.5 m/s2 B) 2.0 m/s2 C) 1.5 m/s2 D) 1.0 m/s2
Compared with protons, neutrons are more effective nuclear bullets in nuclear reactions since they have
A) slightly greater mass than a proton. B) no charge. C) a wider cross-section than a proton. D) all of the above E) none of the above