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Let be a smooth parametric surface and let P be a point such that each line that starts at P intersects S at most once. The solid angle Ω(S) subtended by S at P is the set of lines starting at P and passing through . Let S(a) be the intersection of Ω(S) with the surface of the sphere with center P and radius a. Then the measure of the solid angle (in steradians) is defined to be
|Ω(s)| = areaf s(a) / a2
Apply the Divergence Theorem to the part of Ω(S) between S(a) and to show that
|Ω(s)| = ∫s∫ (r·n) ds / r3
where is the radius vector from P to any point on S, r = |r|, and the unit normal vector is directed away from P.
A class has 10 business majors and 15 econ majors. If Five students are chosen at random, what is the probability that three are business major and two are econ majors?
a picnic area has the shape of a trapeziod. the longer basse is 8 more than 3 times the length of the shorter base and the height is 1 more than 3 times the shorter base. what are the dimensions if the area is 4104 square feet?
If the surface area decreases at 240 cm2/year due to corrosion, how fast is the radius changing when it is 30 cm?
Use the set-builder notation to write the set of odd intergers greater than 4.
two investments were made totaling #15000. for a certain year these investments yielded $1326 in simple intrest. part of the $8800 was invented at 14 and part at 16% find the amount invested at each rate.
Determine the mean oil production with 95 percent confidence
Plot different members of the families y1=x2+C1 and y2=-x2+C2. Constuct a piece wise defined function- not a member of the previous two- which is also a solution of the same DE.
the perimeter of a triangle is 195mm.if the lengths of the sides are consecutive odd integers, find the length of each side.
One important factor in selecting software for word processing and database management systems is the time required to learn how to use a particular system. In order to evaluate three database management systems, a firm devised a test to see how ..
Prove that the two-dimensional compression of a Gaussian function in three dimensions is still a Gaussian.
the length of a second side of a triangle is 2 inches less than the length of the first side. The length of the third side is 12 inches more than the first side. The perimeter of the triangle is 73 inches. Find the length of each side of the trian..
a rectangular field is to be enclosed by a fence and divided into 2 rectangular fields by a fence parallel to one sind of the field. if 1200m of fence is availabile find the dimensions of the field giving the greatest area.
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