algebra

The light intensity of a light bulb varies inversely as the square of the distance from the light bulb. The function I(d) =   k/d^2 models this situation, where I is the light intensity, d is the distance from a light source, and k is a constant. If the light intensity 6 feet away from a light bulb is 20 lumens, what is the light intensity 10 feet away from the same light bulb?

  1. 👍
  2. 👎
  3. 👁
  1. I=k/d^2
    20=k/6^2
    k=20*36

    I=(20*36)/10^2

    1. 👍
    2. 👎
    👤
    bobpursley
  2. Bobo ka sa math

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    The intensity of Illumination on a surface varies inversely as the square of the distance from the light source. A surface is 12 meters from a light source and has an intensity of 2. How far must the surface be from the light

  2. Math

    A fly starts out 2 meters from a light bulb, flies closer to the light then farther away, 2 meters again. At this point the fly goes toward the bulb again but hits the bulb and flies away. Find a function (it may be piecewise)

  3. algebra

    The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the

  4. Optics

    The famous Chinese magician Foo Ling Yu performs a classic magic trick using a concave mirror with a focal length of 1.6 m. Foo uses the mirror to produce an image of a light bulb that is the same size as the light bulb itself and

  1. mathematics

    1.s varies directly as m 2.p varies inversely as n 3.j varies directly as q and inversely as the square of r 4.the pressure(p) of a gas is directly proportional to the temperature (t) and inversely proportional to its volume(v)

  2. math

    The intensity of I of light from a light bulb, measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb. Suppose I is 85 w/m^2 when the distance is 5m. Find the intensity

  3. Math

    The illumination of an object by a light source is directly proportional to the strength of the source and inversely proportional to the square of the distance from the source. If two light sources, one four times as strong as the

  4. Physics

    I need help on this question: You are given information on the intensity level (which is a measure of the sound intensity) at a point and its distance from the sound source. To make use of this information, you will need to

  1. Energy question

    How would a $10.00 compact fluorescent light bulb (15 W) be an overall money saver compared to an incandescent light bulb (60 W) that costs $0.50?

  2. Analytic Geometry(Math)

    a person 6 ft. tall s standing near a street light so that he is 4/10 of the distance from the pole to the tip of his shadow. How high above the ground is the light bulb? if the person's head is exactly 5ft from the light bulb.

  3. brain teaser

    You are standing outside a closed door. On the other side of the door is a room that has three light bulbs in it. The room is completely sealed off from the outside. It has no windows and nothing can get in or out except through

  4. Physics

    Unpolarised light of intensity 4.0Wm^−2 is incident on a polariser placed at 15∘ to the vertical. State the intensity of the transmitted light. I've tried 4 x cos(15)^2 = 3.732050808, but it says "Unpolarised light is a random

You can view more similar questions or ask a new question.