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A man 160cm tall, walks away from a source of light situated at the top of a pole 6m high, at the rate 1.1m/sec.how fast is the length of his shadow increasing when he is 1m away from the pole?

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6ya6ya
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Posted on Jan 02, 2017

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jackthecoinr
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SOURCE: TRIGONOMETRY

set up your ratio:
(20m)/(5m) = x/(182cm)

cross multiplying gives:
(5m)*x = (3640)(m)(cm)

dividing yields:
x = 728cm

Posted on Nov 22, 2007

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SuperTech-11
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SOURCE: The auto print head alignment

It sounds like your black (K) or Black/Yellow (KY) head needs to be replaced.
The problem appears to be in the top half of the black head.
Without knowing more (like what make/model the printer is) I can't help more than that.

Posted on Mar 09, 2011

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A antenna casts a shadow that is 16 yards long. A water tower near the antenna casts a shadow that is 8 yards long. If the antenna is 30 yards tall, how tall is the water tower?


Hi Karla

First off it is 'An antennae'. If the second word starts with a vowel, you use 'an' rather than 'a'. An Orange, an Apple, an Emu etc.

To your homework.

The shadow for the antennae is 16/30 of its height. Therefore the same ratio, or length of shadow to height of object applies.

The water tower is 8/?

Divide 30 by 16, and multiply that figure by 8.

Nov 14, 2016 | Cameras

1 Answer

Trump's Flag Pole


  • Polar Opposition : snopes.com www.snopes.com > Fact Check > Politics > Donald Trump Polar Opposition; Polar Opposition Did ... Trump put up a 50 foot flag pole even though 30 foot ... course construction had them build a 20 foot high grassy hill and ...
  • Did Donald Trump erect a flag on a man-made hill to skirt ... skeptics.stackexchange.com/questions/30177/did-donald-trump-erect... Trump put up a 50 foot flag pole ... 30 foot flag pole. The city agreed. So Trump brought in the company who does Golf course construction had them build a 20 foot ...
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    A taut telephone wire extends 8 meters from a telephone pole to a stake in the ground 3 meters away. How tall is the telephone pole?


    Assuming the wire is at ground level at the stake, the wire is about 7.4 meters above the ground at the pole. How much taller the pole is above that point is unknown given the statement of the problem.

    May 01, 2014 | Computers & Internet

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    Should I pick a fixed length or an adjustable pole?


    Fixed-length poles are popular due to their light weight, but you need to be certain of the length you need before buying. Adjustable poles are slightly heavier and have the advantage of a choice of pole lengths while ascending or descending steep outdoor terrain.

    Sep 04, 2012 | Coleman Camping, Backpacking & Hiking

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    Dusk to dawn light on deck bugs everywhere what can I do to elimate problem


    A traditional buglight place in the shadows will pull away some of your guests.

    May 27, 2012 | Home

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    The auto print head alignment prints ok. The Nozzle check from top to bottom prints as follows: 3eBK ok; 6C top half light blue - bottom half darker blue; 6C ok; 6M top half light pink - bottom half darker...


    It sounds like your black (K) or Black/Yellow (KY) head needs to be replaced.
    The problem appears to be in the top half of the black head.
    Without knowing more (like what make/model the printer is) I can't help more than that.

    Mar 09, 2011 | Office Equipment & Supplies

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    I want to know which lens in better the 70-200mm vr ii or the 70-300mm. please let me know


    Both have 70 mm as the widest angle of view, and up to 200 mm as telephoto, while one goes 50% further to 300 mm telephoto range. This means you can zoom in on objects further away than with the 200 mm lens. This is called the focal length of the lens.

    The 200 mm offers VR II (second generation of Vibration Reduction) technology, which will allow shooting without a tripod in darker situations than without this technology. This can be a very handy feature if you are in low light situations and don't like to carry a tripod around.

    Besides the focal length, a big part of a lens's cost and desirability is how "fast" it is. A lens that has an opening of "f2" is said to be "twice as fast" as one that is "f4". Another way to think of it is that it can allow twice the amount of light into the camera in the same amount of time that an f4 lens can. This means you can shoot in 1/60 sec at f2 as opposed to 1/30 sec at f4 to get the same amount of light in the image. If you don't have a tripod, and you're shooting at 70mm, 1/60 sec is the slowest you can shoot to get a non-blurred image (don't shoot slower than the inverse of the focal length: 70mm = 1/70 sec or 1/60 sec and when zoomed in 200 mm = 1/200 sec - or 1/250 on your camera) The more inexpensive wide angle zooms are often f4.5 - f5.6 and can run several or more hundred dollars. The f2 lenses cost several times more than the f4 - f5 counterparts. This is where the VR technology comes into play. This feature "freezes" the image to allow for an exposure that would be too blurry or otherwise not viewable. You can read a quick article about the differences between VR and VR II for Nikon lenses here. There are others to read, too - so read more than one for more than one opinion.

    Another variable, is the coatings. Multi-coated lenses are generally more expensive than single or non coated lenses. Each coating reduces unwanted effects of stray light, etc. that can cause flares on images, etc. You can read more about coatings here.

    There are other variables, but those are the main points. You'll have to weigh the differences between the lenses, your intended use for them and cost.

    I hope this provided a good starting point for you and good luck!

    Nov 18, 2010 | Nikon D90 Digital Camera with 18-105mm...

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    Reduce shadow


    All solid objects cast a shadow; it cannot be avoided. Certain techniques will help control or reduce the shadow by eliminating or reducing the harshness of the flash. Some of these techniques are: Elevate, eliminate or soften the flash: Make sure the flash is above the lens when you camera is turned to vertical (portrait) orientation. If the on-camera flash is higher than the subject, the lens should not "see" the shadow in most situations. Make sure the camera is higher than the subject, but not so high that you make a shadow in the other direction (under your subject's eyebrows, nose or chin, for example). If there is enough natural light, you might be able to turn the flash off, or you can add "natural" light to the scene by opening curtains, turning on room lights, and so on. In low light you can still photograph without the flash by making sure the camera does not move during the exposure. Consider using a tripod or monopod. The auto color balance feature should automatically adjust the color for the light source. Sometimes it is helpful (at least minimally) to include a white or near neutral grey item within the camera's field of view to assist the camera's color balance assessment. Mixed lighting gives mixed results. Illuminate, eliminate, or move away from the object that has the shadow cast upon it (a wall, for example). Or, use it to your advantage by angling for a better position that may bounce and diffuse the light from the on-camera flash by reflecting light off the wall. Some photographers might lay a white sheet in front of the subject to soften the light by bouncing the light off the ceiling.

    Aug 29, 2005 | Kodak EasyShare CX7530 Digital Camera

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