Which of the following statements about apparent and absolute magnitudes is true?
A) A star's absolute magnitude is the apparent magnitude it would have if it were at a distance of 10 parsecs from Earth.
B) The magnitude system that we use now is based on a system used by the ancient Greeks over 2,000 years ago that classified stars by how bright they appeared.
C) A star with an apparent magnitude of 1 appears brighter than a star with an apparent magnitude of 2.
D) The absolute magnitude of a star is another measure of its luminosity.
E) All of the above are true.
E
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A 3.0-?C positive point charge is located at the origin and a 2.0 ?C positive point charge is located at x = 0.00 m, y = 1.0 m. Find the coordinates of the point where the net electric field strength due to these charges is zero
A) x = 0.00 m, y = 0.55 m B) x = 0.00 m, y = 0.67 m C) x = 0.00 m, y = 1.5 m D) x = 0.00 m, y = 0.60 m
Double-Slit Interference: Two thin slits are 6.00 ?m apart. Monochromatic coherent light falls on these slits, and produces a fifth-order bright interference fringe at an angle of 32.3° away from the centerline. What is the wavelength of the light?
A. 164 nm B. 416 nm C. 614 nm D. 641 nm
A particular chemical reaction occurs at room temperature (293 K) at half the rate that it does at 300 K. What is the activation energy for this reaction?
a. 
b. 
c. 
d. 
1.0 kg is at (-2.0, 2.0); 2.0 kg is at (2.0, -4.0); and 3.0 kg is at (2.0, 0.0)
(a) What is the x coordinate of the center of mass? (b) What is the y coordinate of the center of mass?