The Sun and the Moon have an angular size of approximately ________.
A. 1 degree
B. 23.5 degrees
C. 2.35 degrees
D. 5 degrees
E. 0.5 degree
Answer: E
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The magnetic field in a cyclotron is 0.50 T. Find the magnitude of the magnetic force on a proton with velocity of 
m/s in a plane perpendicular to the field.
A. 
B. 
C. 
D. 
Spiral galaxy rotation curves are generally fairly flat out to large distances. Suppose that spiral galaxies did not contain dark matter. How would their rotation curves be different?
A) The orbital speeds would fall off sharply with increasing distance from the galactic center. B) The orbital speeds would rise upward with increasing distance from the galactic center, rather than remaining approximately constant. C) The rotation curve would be a straight, upward sloping diagonal line, like the rotation curve of a merry-go-round. D) The rotation curve would look the same with or without the presence of dark matter.
Based on our current understanding of physics, we can understand the conditions that prevailed in the early universe as far back in time as about ________
A) 10 billion years ago B) 10-45 seconds after the Big Bang C) one ten-billionth of a second after the Big Bang D) 380,000 years after the Big Bang
The drive chain in a bicycle is applying a torque of 0.850 N ? m to the wheel of the bicycle. The wheel has a moment of inertia of 0.100 kg ? m2. What is the angular acceleration of the wheel?
What will be an ideal response?