A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.0 
then the tangential acceleration of a point 3.0 cm from the center of the CD after 3.0 sec is
A. 0.40 
B. 0.25
C. 0.10
D. 0.06
E. 0.03
D. 0.06
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A piezoelectric actuator is being produced for a scanning tunneling microscope. The piezoelectric actuator is to be 1×10-3 m in length and produced from barium titanate, which has a dielectric breakdown strength of 6×106 V/m. The piezoelectric strain coefficient of the barium titanate is 1.9×10-10 m/V. Assume that the maximum electric field that can be applied to the piezoelectric material is 1×106 V/m.
(a) What is the required voltage to produce an atomic-scale displacement of 0.1 nm? (b) What is the displacement produced by 1000 V? (c) With 1000 V applied, is the piezoelectric safe from dielectric breakdown?
A one-dimensional or line defect in a crystalline material is a(n) _____________.
Fill in the blank(s) with the appropriate word(s).
A(n) ____________________ is a rapidly spinning neutron star that accelerates charged particles near the poles of its magnetic field
Fill in the blank(s) with correct word
Which of the features is seen on the surface of Europa?
A) impact craters B) giant cracks C) water ice D) all of these are seen