A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 
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 15.0 seconds from the start?
A. 0.5 
B. 1.0
C. 1.8
D. 2.0
E. 2.6
B. 1.0
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An atom that has lost or gained one or more electrons is called a(n) ____
a. ion b. isotope c. nucleus d. molecule e. electron
A proton, moving east, enters a magnetic field. Because of this magnetic field the proton curves downward. We may conclude that the magnetic field must have a component
A) towards the south. B) towards the north. C) towards the west. D) upward. E) downward.
A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s b. 0.63 s c. 0.69 s d. 0.59 s e. 0.47 s
The ground state electronic configuration for magnesium is 1s22s22p63s2 . Which of the following would most likely result in an element being chemically similar to magnesium?
a. the valence subshell having 2 electrons b. the valence electron being an s2 electron c. the valence electron being a p2 electron d. the valence electron having principal quantum number 3