What is the significance of this photograph?
A) It shows the first person ever to land on Mars.
B) It shows a person standing on the most distant world ever visited by a human being.
C) It shows the first person ever to go into space.
D) It was taken Jan. 1, 2000, to commemorate the turn of the millennium.
B) It shows a person standing on the most distant world ever visited by a human being.
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A 6.00 kg mass is located at (2.00 m, 2.00 m, 2.00 m) and a 5.00 kg mass is located at (–1.0 m, 3.00 m,–2.00 m). If this system of masses rotated about the Z-axis perpendicular to the X-Y plane, then the moment of inertia of this system is
A. 60 kg 
B. 79 kg
C. 85 kg
D. 98 kg
E. 112 kg
A barrier that blocks or restricts the downstream movement of a stream
What will be an ideal response?
In which case can total internal reflection occur? nwater = 1.333, nglass = 1.50, nair = 1.000
A. At the interface between glass and water, when traveling in glass. B. At the interface between glass and water, when traveling in water. C. At the interface between air and water, when traveling in air. D. At the interface between air and glass, when traveling in air.
If you draw a spacetime diagram, the worldline of an object that is accelerating away from you is
A) vertical. B) horizontal. C) slanted. D) curved. E) a circle.