A 5.00 kg mass is located at (2.00 m, 0.00 m, 0.00 m) and a 3.00 kg mass is located at (0.00 m, 4.00 m, 0.00 m). The center of gravity of the system of masses is
A. (1.25 m, 1.25 m, 0).
B. (1.50 m, 1.50 m, 0).
C. (1.25 m, 1.50 m, 0).
D. (1.50 m, 1.25 m, 0).
E. (1.00 m, 1.00 m, 0).
C. (1.25 m, 1.50 m, 0).
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It was ________ in the Galactic disk that threw Herschel's model of the size and structure of the Galaxy off badly
Fill in the blank(s) with correct word
Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and cord have negligible mass and 
(2.0 kg) moves on a horizontal surface without friction, 
(2.0 kg) is suspended vertically. What is the acceleration of 
?
A. 3.9 
B. 12
C. 6.0
D. 4.9
According to Kepler's 3rd law, we expect:
A. A more distant planet, e.g. Jupiter, to spin about its axis faster than the Earth B. A more distant planet to spin about its axis slower than the Earth C. An interior planet, e.g. Venus, to spin about its axis faster than the Earth D. none of the above
The ionization energy for the hydrogen atom is 13.6 eV. What is the energy of a photon that is emitted as a hydrogen atom makes a transition between the n = 4 and n = 3 states?
a. 3.40 eV c. 6.80 eV b. 0.66 eV d. 2.55 eV