Answer: b) 6
Step-by-step explanation:
Given : The illuminance of a surface varies inversely with the square of its distance from the light source.
i.e. for d distance and l luminance , we have
, where k is constant. (1)
If the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters.
From (1), we have
(2)
For the distance (d) corresponds to the illuminance to 30 lumens per square meter , we have
Put value of k , we get
Then , the number of meters should the distance of the surface from the source be increased= 12 meters- 6 meters = 6 meters.
Answer:
1.99,2.65, 3.49,4.94,6. 25,7.49,8.64,9.79
Step-by-step explanation:
I think those are the answers
Answer:
V = 175
Step-by-step explanation:
Look at the attachment
Answer:
3.5
Step-by-step explanation:
the sqr root of 4 is 2
the sqr root of 3 is 1.5
Answer:
Each ticket is $4.25 and five tickets would cost $21.25
Step-by-step explanation: