A 78 kg object is travelling due North at 15.2 m/s, and experiences a constant net force of 1.72 kN toward the South. 0.75 s later, what will its velocity be?
A. 18.8 m/s, South
B. 1.4 m/s, South.
C. 1.4 m/s, North.
D. 18.8 m/s, North.
E. 16.5 m/s, North
F. 16.5 m/s, South
B. 1.4 m/s, South.
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About how far away from Earth would the Sun be located on this scale?
A) 3.75 meters (about 12 feet) B) 37.5 meters (about the height of a 12-story building) C) 375 meters (about the length of four football fields) D) 37.5 kilometers (the size of a large city)
Our Sun will fade in luminosity as its supply of hydrogen drops in a billion years
Indicate whether the statement is true or false
The difficulty of taking a photograph of an atom with light is
A) unwanted diffraction. B) that atoms are smaller than wavelengths of light. C) both of these D) neither of these
The spiral arms are blue from the presence of Population ________ stars in them
Fill in the blank(s) with correct word