Ahemisphere made of dielectric material has its flat surface on the x-y plane. it is polarized in the z direction: p = p zˆ , where p is a constant. a) find the bound volume charge density. b) find the bound surface charge density on the flat and on the hemispherical surface. c) find by integration the net bound charge of the hemisphere. d) find by integration the dipole moment of the bound charge, with your coordinates’ origin at the center of the flat surface (i. e., by the formulas of chapter 3). e) calculate the dipole moment also by using the definition of the polarization p in section 4.1.4, which results into p = ∫ p dv .

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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c) power lifting, will be your answer.

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