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

Physics & Space Science

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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?

Physics & Space Science

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

Physics & Space Science

A one-dimensional or line defect in a crystalline material is a(n) _____________.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

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

Physics & Space Science