A Person Is Standing 40 Feet Away From a Street Light That Is 30 Feet Tall. How Tall Is He If His Sh

did you give enough info? any info on the shadow of the streetligth?

A Person Is Standing 40 Feet Away From a Street Light That Is 30 Feet Tall. How Tall Is He If His Sh 1

1. Do you think your city would welcome a more efficient street light system like Los Angeles will have?

I think the small city I now live in (east of Los Angeles) could benefit from the new design. One of the key design elements is the sidewalk lighting, which wasn't cost effective prior to the introduction of LED streetlights. Sidewalk lighting should make it more inviting to walk about after dark- something that residents have asked for, but rarely got. Also, a 5G partnership with antennas as part of the design might help generate revenue for the City- or, the City could offer free WiFi on the poles.Do you think your city would welcome a more efficient street light system like Los Angeles will have?

2. Do you have a timed street light that is always red when you come to it?

YES! There's one such light a mile down the road. Turns red even if nobody is waiting for it across the street, and stays red for about 10 seconds before turning green

A Person Is Standing 40 Feet Away From a Street Light That Is 30 Feet Tall. How Tall Is He If His Sh 2

3. A street light is mounted at the top of a 15 foot tall pole. A man 6 ft tall walks away from the pole with a s?

His shadow should be moving exactly the same speed as his, whether it's the top of his head, or a point on his leg shadow

4. How fast is the length of his shadow changing when he is 12 m from the street light?

85 solve for s: s(1/12 - 1/1.85) d/12 = 0 s = d/12 / (1/1.85 - 1/12) This looks complicated but it's really just a linear eq: s = m * d m = 1/(12/1.85 - 12/12) (I distributed the 12 on the bottom) therefore: ds/dt = m * dd/dt so ds/dt = is constant = 2.2 / (12/1.85 - 1) = 2.2 * 1.85 / (12-1.85) oops, it should be negative because dd/dt is technically negative (since the he's walking TOWARD light and therefore d is getting smaller and therefore negative)

5. A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole?

let x be the distance of the man from the pole , & s the length of shadow by similar triangles, s/6 = x/(15-6) s = (2/3x rate at which shadow length increases, ds/dt = (2/3) dx/dt = 8/3 ft/s

6. I was driving my ninja 250 08 idk how fast i was going but there was a street light that changed real fast and?

Street lights do not "change real fast" - they are entirely predictable, if you look far enough ahead you can see the light is on green (or red) - you know that, at some point, it is going to change, so you can anticipate it, you decide a point after which, if the light changes, you will not be able to safely stop - so you go through it. Braking should be on the front brake, the back brake is a long way behind the front in terms of efficiency. The truth is you are riding too fast for your ability and the road conditions, the result of this is often painful.

7. Why is there a street light in my backyard?

I can's speak for your power company but I know that where I live if we wanted a light on a pole on our property they will put one there and the charge is like $5.00 per month

8. Who Do I Contact About A Burnt-Out Street Light?!?

i would guess it would depend on whether you are on a state highway, a county road or inside city limits. you might start with city hall in nearest town and they should be able to refer you to the right department

9. How Does a Street Light Work?

Photocells detect if light is needed. Photocells are light-sensitive sensors that respond to the amount of light detected. When the light is too low, such as at dusk or under heavy overcast skies, the sensor tells the computing unit within the streetlight to activate the flow of electricity. When the photocell detects too much light, the sensor will deactivate the streetlight (e.g., at dawn). Electricity is sent through high-intensity discharge lamps. A high-intensity discharge lamp emits light by an arc of electricity created between two electrodes. The electrodes are in a transparent tube filled with gas and metal salts. The electrical arc generates heat, which works with the gas and metal to create light-emitting plasma. Streetlights use bypass technology. Through use of either isolation transformers or film cutout technology, streetlights are able to pass the voltage through to other streetlights when they are burned out. Much like older Christmas tree lights, streetlights are connected in series design; the current to operate five streetlights on the same street flows from light 1 through 2, 3 and so on. In the past, when one light burned out, the streetlights after it would not power on since the current could not cross the dead bulb. Isolation transformers carry the current across regardless of a working or nonworking bulb. If a streetlight burns out, the current bypasses the burned-out circuit and runs along the film cutout. Streetlights are carefully planned. Streetlight issues include light pollution of the night sky and interference with night vision of drivers. A sudden inability to perceive lighting and distance at night due to street lighting is because of the accommodation reflex of the human eye as cars move from a darkened area to an area illuminated by a streetlight. The pupils of the eye cannot adjust fast enough moving from dark to light and back again, causing issues. Light pollution is considered an environmental issue of street lighting. It includes excessive light bleeding onto private property, blinding glare and overillumination of areas and buildings. There is also the issue of unwanted voltage where a streetlight can project stray voltage spikes and injure those nearby. This is rare but possible, especially during electrical storms. To deal with the issues of night vision, light pollution and voltage accidents, only a certain number of street lights are installed within a given area, and they are designed for low-light exposure to drivers. Some lights are fitted with an alarm notifying nearby individuals of dangerous voltage issues until they are repaired.

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