best illumination of a piece of art, a lighting specialist for an art gallery recommends that a ceiling- mounted light be 3 meter from the piece of art and that the angle of depression of the light be 30c. How far from a wall should the light be placed so that the recommendations of the specialist are met? Notice that the art extends outward 10 cm from the wall. (a) 2.7 m (b) 1.8 m (c) 3.9 m (d) 3.1 m
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Answered by
2
Answer:-
40 cm.
Explanation:-
Let the breadth of the wall be x metres.
Then, Height = 5x metres and Length = 40x metres.
x * 5x * 40x = 12.8
=>x3 =12.8/200 = 128/2000 =64/1000
=> x = 4/10 m
=> x = (4/10)*100 = 40 cm.
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Answered by
1
Explanation:
A grouped frequency table with class intervals of equal sizes using 250 -270 (270 not included in this interval) as one of the class intervals is constructed for the following data: 268, 220,368, 258, 242,310, 272, 342, 310, 290, 300, 320, 319,304,402,318, 406, 292, 354, 278, 210, 240, 330, 316, 406, 215, 258, 236. The frequency of the class 370-390 is: 5
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