A Street Light Is Mounted at the Top of a 15ft-tall Pole. a Man 6ft Tall Walks Away From the Pole wi

Let x be the distance between the man and the pole, y be the distance between the man and the shadow tip. then (xy)/15=y/6=> (xy)/y=5/2=> y/x=2/3=> (xdy/dt-ydxdt)/x^2=0=> 40dydt-(2/3)40*5=0=> dy/dt=10/3 ft/s

A Street Light Is Mounted at the Top of a 15ft-tall Pole. a Man 6ft Tall Walks Away From the Pole wi 1

1. 1901 manchester st uk the street light poles still there ?

Sorry all gone. But the Northern quarter is the oldest part off the city which was not bombed in the second world war

2. When my street light comes on at dusk, it makes a loud humming noise. What's wrong with it?

Some lighting fixtures do that because they have a power transformer in them. The only way to eliminate the noise, is to buy a different type of light

A Street Light Is Mounted at the Top of a 15ft-tall Pole. a Man 6ft Tall Walks Away From the Pole wi 2

3. Street Light Effect: Does anyone else experience it?

What is the Street Light effect?

4. What is the height of a man walking away from a street light 12 ft high, if his shadow is moving twice as fast as he is? [duplicate]

Denote the heights of the lamppost and of the man by $h_l$ and $h_m$, and denote the distance of the man and of the tip of his shadow from the lamppost by $m$ and $s$. Then $$sover h_l=s-mover h_m$$ and therefore $$s=h_lover h_l-h_m m$$ at all times. The condition $dot s=2dot m$ leads to $h_m=displaystyleh_lover2=6$ ft.

5. Street light intersections; on top of each light has the senors that tells it to turn green?

The "senors" are for emergency vehicles. I have seen some that are operated by strobe lights that are mounted on the roofs of fire trucks and ambulances. There may also be weight sensors embedded in the pavement so that the lights can operate out of sequence during low traffic periods.

6. I have a street light that needs a power source. I'd like to use solar instead of hard wire. What system should I use?

Q: I have a street light that needs a power source. I would like to use solar instead of hard wire. What system should I use? A: One that can accumulate and store in a battery on the shortest darkest day of the year enough energy to illuminate the entire night which is going to be the longest night of the year.

7. Why do so many people disbelieve in street light interference?

You are talking about basing the belief entirely on testimonial evidence. Here is whats wrong with testimonial evidence. The person is looking for stuff to confirm their belief that there is something supernatural going on. When they give their testimony all you hear is about how street lamps go off as they pass by, and electronic devices fail to work. In reality this happens to all of us. From time to time lights go out and devices malfunction. However, when you only mention these incidents, it makes it sound like its the only thing going on in ones life. Paying attention to these incidents and ignoring the rest of life is called "confirmation bias" and is the cornerstone for paranormal beliefs. I have yet to see or hear about someone who walks down the street and every street lamp they are near goes out, and comes back on when they get a distance from the lamp. This does not happen. What does happen is lamps start to go on and off, and if someone happens to be walking by that lamp, then one lamp will go off. Here is whats really going on. Street lamps are filled with a gas. As the gas gets low in the lamp, it settles and does not touch the filament, and the lamp goes out. As it settles it actually stirs a bit, and when some touches the filament again, the entire lamp goes back on. At a certain level, the gas in the lamp will continue to cycle like this and the lamp will go off an on every few minutes or so.

8. What's the normal height of a street light pole?

That's a little like asking "how big is a normal house." It varies greatly, depending on a number of factors, including your opnion of what "normal" is.Street light poles are generally from 8 to 50. Above 50 it's considered highmast which is technically street lighting but probably not what you're asking about. Depends on the type of fixture, the environment, the type of road, the policies of the owner of the light (DOT, utility, city, etc.), the output of the fixture, etc.Ask a more specific question, and I might be able to answer it. What is the normal height of a street light pole?

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Who Invented the Street Light?
someone retarded1. which china led street light manufacturer is better?My english is poor and can not tell you too much about street light products, but I suggest you see products here WWW.IBTSLED.COM2. why does the street light in front of my house keep turning on and off every few minutes?Its the ballast. When the bulbs go out they just quit working. When the ballast starts to go bad, they heat up, shut down when it cools down again they come back on till they heat up again3. Street light goes out when I walk by?please dear, do not you call yourself 'crazy' ever, please. i do not know anything useful information to help you but i do know somethings; 1st of all whoever made fun of your question is himself/herself a jerk and i knew it & so many other people know it too that when they read your question they thought of the " power" of your's & maybe a lot of them wanted/wished that what if they had the power that you have. once i watched a show on t.v. ( not faking) that on peiple with some mysterious things/power or events. on 1 particular episode, there was a man, whenever he saws a bulb or like he went into a shop & if there's a bulb it just went off without any reason like, its just fused( suddenly & it happens every-time) and did not light again( he told that himself & demonstrated it also; he said why it happenes i do not know & that's why in my home i do not have any bulbs for lighting purpose.) so i think maybe you can find some similarities inyour & his case if you believe. otherwise i just wanna say that just believe in yourself & in the good things in yourself ( by good things i did not mean that your gift is a bad thing). do take some time from your daily schedule & do some research, it will help you to find the qualities in yourself because knowing oneself, one's mind, heart & soul is like knowing or get fascinated by a superstar ( if you can like a celebraty & his life how come you do not like your's? hope you will get it what i wanna say, right na?). who knows you would be among some very lucky people who help me & other normal people like me through their gift. thanks for reading my message to you and if you like you can share anything with me. take care.4. When you were a kid did you often break the street light rule?My Dad was a Sergeant in the Army during WW 2. Have you ever heard one of those guys yell? We made it home as soon as the lights came on. Having the entire town know you were late just was not a pleasant event.. we would hear all about it at school the following day.. Sigh.5. When you were a kid did you often break the street light rule?sometimes i stay at my friends house till like 3A.M. im 14 so yea, but one time i broke a streetlight, i shot it with my bebe gun6. what does it mean when you drive under a street light and it goes out?I had a physics teacher in High School who let us ask him random questions at the beginning of class each day. One of the students asked him this question, and his answer was that each of us emit a certain energy. If the light turns off or on, it was because your energy was at the same frequency as the electricity in the bulb. He also dedicated a day of class to ESP, and got mad at us when we threw off his vibe... and he thinks JFK was abducted by aliens, and will return in the year 2025... so, you can judge yourself whether or not to give his explanation any merit... :D7. PSE Begins Smart Street Light Installations To Help Customers Save Energy, Reduce CarbonPuget Sound Energy will begin installing street light control capabilities, also known as smart street lights, to help its lighting customers save money and reduce carbon. The technology will give PSE municipal customers more choice on how they light up their roads and communities by measuring energy consumption and using adaptive controls to lower usage in specific locations and times of day while also enhancing safety measures. The smart grid technology will add controls and software to LED street lights to enable two way communication. Smart street lights can be instantly turned on and off or dimmed for benefits like energy conservation or reducing light pollution at night. The ability to monitor each light's performance means broken and failing lights can be quickly identified and repaired. Because smart street lights can operate more efficiently, customers will be able to optimize their energy use, lower costs and reduce carbon in our environment. "Our lighting customers told us they wanted more control over their energy usage to save money and reduce carbon, and this technology will help meet both those needs," said PSE Director of Product Development and Growth Will Einstein. "New technology such as smart street lights will help us partner with our customers to meet their goals and improve the customer experience." Energy measurement that would facilitate metered billing as opposed to flat rate billing Remote control for dimming, turn off and turn on Uses less energy through dimming and reduces carbon as a result The City of Bellevue will be one of the first to receive the installations. PSE will be replacing around 300 roadway lights in some of Bellevue's arterial roadways with LED lights. It's part of the city's overall effort to reduce its carbon footprint. "We value innovation as a community and so appreciate that PSE partnered with Bellevue as one of the first two cities to receive new smart street lights," said Mayor Lynne Robinson. "In addition to energy efficiency and cost savings, it has the potential to help PSE respond more quickly to burned out lights owned by the company. It will be a positive safety boost for our Vision Zero effort to eliminate serious-injury and fatal crashes on city streets by 2030." Smart street lighting installations will also soon begin in the City of Edgewood with the installation of about 50 smart light controllers. "The City of Edgewood is excited to partner with PSE to incorporate Smart technology for immediate two-way communications and control of our street lights," said Edgewood Mayor Daryl Eidinger. "This control will give us feedback for malfunctions and allow us to reduce our usage, light pollution and our carbon footprint." Other cities within PSE's service area will also be able to engage with PSE on controls. PSE has partnered with Landis Gyr to equip 25,000 street lights with smart controls over five years. This is another way PSE is working together with customers to create a clean energy future for all as the company has also set an aspirational goal to be a Beyond Net Zero Carbon company by 2045. PSE will target reducing its own carbon emissions to net zero and go beyond by helping other sectors to enable carbon reduction across the state. Partnering with municipalities in its service area will help towards that mission. For more information on the smart street lighting program.
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