# Would You Rather Be a Street-LAMP Or a LAMP-Shade?

neither...I AM a disco strobe light! Ill make you all epileptic =)

1. A street lamp weighs 150 N. It is supported by two wires that form an angle of 120 degrees with each other..?

Any system...let me repeat...any system that is not accelerating (or decelerating) has balanced forces acting on it so that the net force (f) is exactly zero. This results because f = ma = 0 if and only if a = 0 for a mass m. OK your weight W = 150 N is not accelerating, in fact it is static; so there is no motion whatsoever. So f = 0 = ma for the system, which includes the weight and the two wires. This means that something is canceling out the weight because f = ma = W - F = 0; where F is that "something" canceling the weight (W). The only "something" you've defined for your system is the forces pulling up by the attached wires. Since there are two wires, each one has a share of that upward force. By "upward" we mean vertical force acting in a direction opposite of the weight (W). As there are 120 deg between the two wires, the vertical force for both wires is W cos(60) = Fv and for each individual wire, it's Fv/2 = (W/2) cos(60). Similarly, the horizontal force on each wire is Fh = (W/2) sin(60). Since the vertical and horizontal forces form a right angle for each wire, the force along each wire, the tension, is T = sqrt(Fv^2 Fh^2). And, by substitution, T = sqrt((W/2)^2 cos(60)^2 (W/2)^2 sin(60)^2) = sqrt[(W/2)^2 [sin(60)^2 cos(60)^] = sqrt((W/2)^2) = W/2. a. Thus, the tension (T) in each wire is one half the weight of the street lamp = W/2. b. Following the same line or reasoning used to find the tension at 120 deg, we see that the angle makes no difference because sin(deg)^2 con(deg)^2 = 1.0 no matter what deg is. Tension, therefore, will still be W/2 in each wire with 90 deg between them. The important thing to remember is that, if the system is not accelerating or decelerating, the net force on it is zero. So all the forces acting on it will cancel out.

2. The â€˜Street lamp charger' is coming - Bender

The concept, of charging electric cars directly off roadside lighting (street lamps), is as simple as it is smart. Requests for the street lamp variant of the 'Berlin' charging point are coming in thick and fast. "The integration of power sockets in existing infrastructure like street lamps [...]" is a "[...] fundamentally available technical solution". This prompts the authors of Germany's nationwide call for financial funding to set up a charging infrastructure as part of the 'Immediate Clean Air Programme 2017 to 2020' [Sofortprogramm Saubere Luft 2017 bis on 4 January this year. The Ministry employees are also thinking along the right lines with their depiction of 'Street lamp charging' as a low-cost charging infrastructure, and they further reason: "At present, affordable charging facilities are absent in many applications, at places where people park for extended periods and could charge their vehicles, for example overnight. This prevents those affected from being able to consider electric vehicles as a genuine alternative form of mobility. One example of this would be users who either do not have access to a fixed parking space or who are not able to equip the one they have with a charging point". The Berlin start-up and partner of Bender GmbH & Co. KG, ebee smart technologies GmbH, would have to formulate its founding myth in a similar way. In fact, the vision right from day one of this manufacturer of charging infrastructure, founded back in 2011, was to use the electrical infrastructure already in the public domain for the charging of electric vehicles. What has emerged from this is the 'Berlin' charging point, developed and sold by ebee. Its slimline hardware enables it to be fitted to street lamps quickly and easily, as well as to walls, pillars or to 'urban furniture'.

3. The wavelength of the blue light given off by a mercury vapor street lamp is 436 nm. What is the frequency of?

E = h c / wavelength h is Planck's consistent, c is the speed of sunshine in m/s and wavelength will be expressed in meters The E that you calculate is in accordance to photon. So multiply the consequent quantity by technique of technique of Avogadro's quantity, and also you are finished

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