What is a black hole?
A. a binary star
B. a product of our imagination
C. massive collapsed stars with strong gravitational fields
D. massive collapsed stars with strong electromagnetic fields
C. massive collapsed stars with strong gravitational fields
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Describe how a satellite is placed into orbit and remains in orbit around the earth
What will be an ideal response?
An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the x-axis, the second is 75 N along a direction making a counterclockwise angle of 150° with the x-axis
What is the direction of the third force, measured counterclockwise from the x-axis? A) 128° B) 182° C) 226° D) 255° E) 262°
Diatomic molecules such as 
and
undergo simple harmonic motion with frequencies that obey Hooke’s Law with the effective mass being half the atomic mass. If the mass of an oxygen atom is 2.66 x 
kg, and the observed frequency of oscillation is 
Hz, what is the effective spring constant associated with the bond between the atoms in an oxygen molecule 
A. 1140 N/m B. 182 N/m C. 116 N/m D. 29 N/m E. 2290 N/m
Identical point charges Q are placed at each of the four corners of a 3.0-m × 4.0-m rectangle. If Q = 40 ?C, what is the magnitude of the electrostatic force on any one of the charges?
A. 3.0 N B. 2.4 N C. 1.8 N D. 3.7 N E. 2.0 N