The velocity vector at a point in a fluid flow is given by 5i + 12j. The unit vector which is perpendicular to the streamline passing through the point is:
(A) (?12i + 5j)/13
(B) (?12i ? 5j)/13
(C) (5i + 12j)/13
(D) (?5i + 12j)/13
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Most of the mass of the Milky Way is in the form of
A) stars B) gas clouds C) black holes D) dark matter
An electric generator
A) can create enough energy to light cities. B) can convert mechanical energy to electric energy. C) needs no energy source. D) all the above E) none of the above
A charge of 5.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of ?2.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 3.0 cm from the center of the two surfaces
a. 30 N/C b. 50 N/C c. 40 N/C d. 20 N/C e. 70 N/C
What is the self-inductance in a coil that experiences a 3.0-V induced emf when the current is changing at a rate of 37 A/s?
a. 81 mH c. 27 mH b. 37 mH d. 45 mH