The Milky Way can be seen only from the Northern Hemisphere
Indicate whether the statement is true or false
FALSE
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The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of ________
Fill in the blank(s) with correct word
A swimmer has a metabolic rate of 600 W. How many breaths per minute should the swimmer take if her lungs take in 0.50 L of air in each breath, and the percentage of oxygen in the air is 21%?
a. 25.2 b. 120 c. 33.5 d. 17.1
A pulley system holding a rope that is pulled out a distance of 20 m is used for lifting a 2500 kg grand piano. The piano can be raised 3 m by application of a 375 N force to the rope
What will be an ideal response?
Imagine that we place a spherical shell with a uniformly distributed positive charge Q and a particle with a negative charge -4Q as shown below. What are the directions of the total electric field vectors at the two points shown? 
What is the direction at point P1 at the shell’s center?
A. A B. B C. C D. D E. zero F. other G. AA H. BB I. CC J. DD