A Street Light Is at the Top of a 15 Ft Tall Pole. a Woman 6 Ft Tall Walks Away From the Pole with a

This is a related rates problem... Va = Vb Vb/a The velocity of the tip of the shadow is equal to the veolcity of the person plus the velocity of the tip with respect to the person. Call the length of the shadow "s", this is the distance from the tip of the shadow to the person. Call the distance from the pole to the person "x". Draw a straight line from the tip of the shadow to the pole, the path of the light. The angle this line makes with the ground is the same angle in two right triangles. One where the opposite side is the pole, the other where the opposite side is the person. tan = 15 / (x s) = 6 / s 15s = 6x 6s 9s = 6x s = 2/3 x ds/dt = 2/3 dx/dt ds/dt = the rate the tip of the shadow is moving with respect to the person dx/dt = the rate the person is moving away from the pole = 8 ft/s ds/dt = 2/3 (8) = 5.333 ft/s Va = 8 5.333 = 13.333 ft/s

A Street Light Is at the Top of a 15 Ft Tall Pole. a Woman 6 Ft Tall Walks Away From the Pole with a 1

1. Why do people in the USA drive with their high beams on even when there is a street light? Why do they not lower the beam for incoming traffic?

Because you know everything about people in the US and this is in NO WAY another ridiculous question based on a personal/limited experience that you are using as the basis for an extremely over-generalized assumption of the 320 million americans in this country, and how they drive

2. What are the various test needed to be carried out before commissioning a street light?

Street lamps come in two basic forms, the column type or the wall bracket type.The wall bracket type has the control equipment (incoming terminals, time clock, photo detector etc.) on the bracket, so elevated access is essential. The column type has the control gear at ground level. But some sort of service vehicle is still needed to erect it.PreparationsA trunking route for the supply cable will have to be laid. In most cases the lamp will be in the middle of the string, so two such routes will be needed.Pull the cable inMegger it to check for damageTerminate the feed end in a breaker and lock open.ErectionFor bracket types drill and plug the wall and bolt the fitting upRoute the trunking and cables into the control box. For columnar lamps excavate a pit. Erect the column with the lifting apparatus on the vehicle and check the alignment. Thread the cables and ducts into the control chamber and backfill and compact the hole. Do not remove the lifting device until the footing is solid. ConnectStarting from the far end butt the cables and connect to the supply terminal blocks.Set the timing deviceSecure the connection chamber.TestingWhen the last lamp is finished, de-isolate, switch on and monitor the time clock operation. If possible (the access permits may only allow one visit) return to each lamp, overuse the time clock, and check the luminaire operates. Set the time clock.Report any defective lamps for maintainence. (Column lights, in particular, require specialist access vehicles). What are the various test needed to be carried out before commissioning a street light?

A Street Light Is at the Top of a 15 Ft Tall Pole. a Woman 6 Ft Tall Walks Away From the Pole with a 2

3. related rate problem. A street light is at the top of a 20 ft tall pole. A woman 6 ft tall walks away from the?

h/(x h) = 6/20 20h = 6(x h) 14h = 6x h = 3x/7 dh/dt = 3/7 (dx/dt) dh/dt = 3*4/7 = 12/7 ft/s The woman's distance from the pole does not matter since its not constant !

4. Did you have the street light rule when you were little?

no never herd of it

5. How do i get a Street Light installed at my home?

This is not a car question. But I will answer it. You go to the electric company and pay for it and the electric each month

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

Explain what all that means

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

road works or your district council. Depends where ya live as to what you call them . I am in New Zealand

Artículos recomendados
What's the Best Way to Petition the City Against Street Light Cameras?
bleet moan and complain all you like its the best way to catch red light jumpers and you were going too fast if you had to break so hard1. When you were a kid did you often break the street light rule?Well, it comes to a point where even though someone is breaking the law you still do not have the right to kill them if they have no intent of killing you first. Bad driving does not make an excuse for you to drive even worse. You have the responsibility to avoid an accident whenever possible, not just gun it and hope the other side does not die as a result. It could be your own death too. If police wo not keep order then perhaps it's time to grab attention in other ways. Put the camera in your car, but do not go out of your way to hit others. Vigilantism is going to only land you in jail, but do what you want. You can make videos and make sure people who can make a difference do see them. I fully understand your frustrations. I live in the Dallas area where people drive like lunatics and i get so mad, but I am not going to put my own life in even further jeopardy by going to extremes and ignoring others faults and arrogance in the name of taking law into my own hands. I go nuts when I hve to wait in line like everyone else in traffic then some clown decides to drive all the way around everyone in the curb lanes then expect everyone to just stop and let them in. The maddening part is they always do! It's the only time I tailgate to keep them from getting in front and I've gone as far as driving in both lanes half way into the curb and half way in the lane to keep them from cutting, but I wo not gun it to keep them from doing so. I wo not endanger them or others to make a statement. You could move even though you do not feel you should have to, but if nothing is done you might have to. Hitting others or simply ignoring the obvious will eventually get you killed2. i Just Shot a Street light would anything happen to me?You would be in the dark3. When you were a kid did you often break the street light rule?i was always a rule breaker, but my mother was ok with it4. explain whether prices are or are not determined in a free market?The prices , whether it is determined by the market, depends on the type of commodities. Some goods are better left to the market to determine its price, but some needs an interfering hand. For example, prices of house, stock market, handphone, TV are more welfar enhancing if we leave it to free market forces. However, goods such as street light, the cleanliness on the beach, the KTM services, low cost housing are better regulated partially or fully by authority, in order to protect the welfare of the needies. So it depends5. how to calculate power rating and energy consumptions for street light? ?first u hav to know which type of power level malaysia used 3 phase of 415V and single phase of 240V frequency used is 50 Hz u can calculate power consumed by using S=V/Z formula. Z, impedance value might be stated at the light pole. then P, power can be calculated as S cos 0.8 because malaysia only allow 0.8 lagging power factor. then u should times power with how many hours the light work to get that kWH units.6. Coincidence? This morning I prayed and we had a small Earthqake. When I got home..my street light was on but?Wow, you really think you are something dont you? For your uneducated mind, it all depends which line of power went out, which it looks your street didnt go out. That doesnt mean god did it7. All in One Solar Street Light Manufacturer with Best Price in IndiaAll In One Solar Street Lights All In One solar street light is a new-age form of lighting solution integrating solar panels, charge controller, LED light and battery. These lights are available in two varieties, with infrared motion sensors and without, as part of the unit. All In One solar street lights are becoming popular due to their compact design and multiple other advantages. Motion sensors help to adjust the LED brightness intelligently in All In One street lights. Infrared (IR) and passive infrared (PIR) motion sensors are used for motion sensed detection of emitted/reflected infrared energy. The All In One solar street lights with motion sensor switch on in the evening and after a time delay of 30 seconds, the lights automatically reduce their brightness to 20%. Motion sensor is capable of detecting infrared waves that radiate from moving objects, thereby electronically increasing the brightness of the lights. Once motion is detected, there is 100% brightness and if there is no motion detected in the area after the time delay, the light gets automatically adjusted to a dim mode of 20%. The biggest advantage of solar street lights with motion sensors is that they add a sense of security and safety to your property while providing better battery life. Features of All In One Solar Street Lights Controllers used in All In One solar street lights PWM or MPPT charge controllers are used in All In One solar street lights. PWM controller acts as a switch between the battery and solar panel. The battery is charged with constant 3-stage charging, i.e., bulk, float and absorb. Pulse width modulation or PWM is the technique to modulate the pulse width to change the voltage and frequency of energy from solar panel to charge the battery. One of the greatest pros of PWM controllers is that it helps to prevent overcharging while charging the battery. As for the cost, PWM controllers are less expensive compared to MPPT controllers. MPPT (maximum power point) controller offers an indirect connection between the battery and the solar panel. The DC/DC converter takes extra photovoltaic voltage and transforms this into additional current at lower voltage. MPPT controllers adjust the voltage to maintain the most efficient level of power. In cooler conditions, MPPT controllers are observed to be more effective than PWM controllers due to their ability to capture extra PV voltage. Solar panels used in All In One solar street lights Though both monocrystalline and polycrystalline solar panels are used in solar street lights, polycrystalline solar panels are most commonly used in All In One solar street lights due to their cost effectiveness. Since most of the All In One solar street lights use motion sensors, they do not require solar panels with more wattage. Batteries used in All In One solar street lights Lithium ion phosphate (LiFePO4) batteries are widely used in All In One solar street lights due to their multiple advantages. LiFePO4 batteries offer upper and lower voltage protection and longer lifespan. These batteries can operate in different temperature range and are maintenance free. LiFePo4 batteries are the perfect choice for All In One solar street lights due to their relatively small and light feature. Lithium-ion as well as lead acid batteries are also used in some All In One solar street lights. Light source used in All In One solar street light LED light source is used in as it consumes less energy and gives higher luminosity. Installation of All In One solar street lights Compared to integrated solar street lights, the installation of All In One solar street lights can be carried out easily. The All In One solar street light can be effortlessly mounted due to its compact size and also due to the fact that there are no wires or cables to connect. They can be installed either on a pole or on a wall. The pole should be fixed to a flat ground without inclination. The light fixture should be installed to the pole before erecting the pole. The pole should go at least 3 feet deep inside the ground. The basic cage must be secured to the ground using concrete. It is essential to place the poles at even widths to provide uniform brightness to the entire area. The poles must be placed in the right position and angle so that the panels get sufficient direct sunlight throughout the day. Since All In One solar street lights have dusk to dawn feature, they need very minimal maintenance once installed. Rain water washes away most of the dust and dirt off the solar panels; however, routine cleaning of the panels helps the efficiency of All In One solar street lights. The solar panels can be cleaned by wiping them with a soft cloth or spraying water with a jet spray. Occasionally, you may inspect the installation bracket and the mounting arm to look for any damage. The All In One solar street lights are automatic in its function. They are operated with infrared motion sensor which helps to detect movement in its field and illuminate the lights, thereby ensuring security. Also, the controller can be set to operate in a timer-based manner where in the lights operate in full brightness for the first four hours and then later, in lower light for rest of the time. With the motion sensor and dimming options, the All In One solar street lights tend to save energy, thereby guaranteeing longer life to the lighting fixture. No cable work or electric equipment is needed, so the installation/construction cost is lesser. No need of manual intervention after installation, so the management cost is lesser. The lights are powered solely by using solar energy and no conventional energy is used, so the operation cost is lesser. Installation is easier and faster and maintenance is very minimal. Compared to integrated solar street lights, All In One street lights are less expensive. Since All In One solar street light requires direct sunlight to give its full potential at night, it may not be able to meet requirement of the areas with insufficient sunlight. Since having shadows may obstruct the sunlight to fall onto the solar panels to charge them efficiently, installation sites may be limited. Initial investment to purchase All In One solar street light is high compared to traditional lighting system. However, the benefit of advantages is far beyond the shortcomings of disadvantages. With the technological advancement, All In One solar street lights will be more and more used in the coming future.
Solar Street Light Manufacturer Solar Street Light, Solar Street Light Using Pir Sensor and Ldr Yout
Led Street Light China
How to Choose and Adjust Solar Street Light Controller - Blog
Think Green Collection: Editors Choice 10 Best Images
Where Can I Find Plastic Injection Molding Manufacturers in China?
How to Curl Your Hair Like This?
What Is Preventing the Solar Energy and Other Renewables to Replace the Oil?
What Matches This Formal Dress?
Why Does an Air Conditioner Sometimes Take so Much Time to Cool a Room?
related searches
What's the Best Way to Petition the City Against Street Light Cameras?
Solar Street Light Manufacturer Solar Street Light, Solar Street Light Using Pir Sensor and Ldr Yout
Led Street Light China
How to Choose and Adjust Solar Street Light Controller - Blog
Think Green Collection: Editors Choice 10 Best Images
Where Can I Find Plastic Injection Molding Manufacturers in China?
How to Curl Your Hair Like This?
What Is Preventing the Solar Energy and Other Renewables to Replace the Oil?
What Matches This Formal Dress?
Aminica Wigs are dedicated to providing top quality virgin human hair for large trader and wholesaler. Usually they resell it to the retailers then to customers, which results in high price that makes customers awe-stricken.
Contact Us

+86 020-22139352

If you have a question, please contact at contact

Copyright © 2021 Aminica humain Wigs |Sitemap