Which of these does not have an electrical charge?
A) proton
B) electron
C) neutron
D) all of the above
E) none of the above
Answer: C
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 25.0 seconds from the start?
A. 0.47 
B. 0.40
C. 0.34
D. 0.24
E. 0.20
Match the star's position at points 1, 2, 3, and 4 in the plot with the descriptions below.
a) headed straight toward Earth b) headed straight away from Earth c) closest to Earth d) farthest from Earth
Radiometric dating of a rock reveals an age of 1.52 billion years. Given that the half-life of the parent isotope used is 14.0 billion years, what percentage of the parent isotope is still present in the rock?
A) 92.8% B) 10.9% C) 76.4% D) 7.26%
Which of the following is not considered a likely solution to the question of why we are not currently aware of a galactic civilization?
A) There is no galactic civilization because civilizations are not common. B) There is no galactic civilization because civilizations do not leave their home worlds. C) The galactic civilization is deliberately avoiding contact with us. D) The galactic civilization probably is undetectable to us because it makes use of technologies that do not obey the known laws of physics. E) There is no galactic civilization because most civilizations destroy themselves before achieving interstellar travel.