A 12-nC charge is distributed uniformly along the y axis from y = 0 to y = 4 m. Which of the following integrals is correct for the x component of the electric field at x = 2 m on the x axis?
A.
B.
C.
D.
E.
Answer: B
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An airplane flies 120 km at a constant altitude in a direction 30.0° north of east. A wind is blowing that results in a net horizontal force on the plane due to the air of 2.40 kN in a direction 10.0° south of west
How much work is done on the plane by the air? A) -2.71 × 108 J B) -0.985 × 108 J C) -221 × 108 J D) 221 × 108 J E) 0.821 × 108 J
When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced?
A) 0.4 B) 1/4 C) 2 D) 4 E) None of the other choices is correct.
Our own Milky Way's Hubble class, according to the best data, is
A) Sb. B) S0. C) SBb. D) SBc. E) Sc.
Consider a container of 2.0 g of hydrogen, H2 (one mole). Suppose you removed all the electrons and moved them to the other side of the earth
(Earth's radius is 6380 km, k = 1/4??0 = 9.0 × 109 N ? m2/C2, NA = 6.022 × 1023 molecules/mol, e = 1.60 × 10-19 C) (a) How much charge is left behind after you remove the electrons? (b) What electric force do the protons exert on the electrons after they are separated as described?