Question

what are the coordinates of the shadow cast on the xy plane by a small object placed at the point (10,7,20) assuming that the sun's rays are parallel to the vector (5,3,-2)

Answer 1

The vector from the sun to the object is

<5,4,22>

<5,3,-2>+<5,4,22>/11 = <60/11,37/11,0>

Answer 2

why u asking me

Answer 3

I have solved this problem with my expertise. Anonymous, you are absolutely incorrect. WRONG. The answer is..................................

Answer 4

Knowing that the small object is at (10,7,20) and the sun ray vector is [5d,3d,-2d], we can find that the sum is (10+5d,7+3d,20-2d). Then, knowing the object is on the xy plane, we can make the z-coordinate (20-2d) equal to 0. d=10. Then we do [5(10),3(10),-2(10)]=[50,30,-20]. Finally, we add that to our starting point (10,7,20) to get the answer of (60,37,0). You're welcome.