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It consists of a spring fixed at one end with a hook to attach an object at the other. [1] It works in accordance with Hooke's Law, which states that the force needed to extend or compress a spring by some distance scales linearly with respect to that distance. Therefore, the scale markings on the spring balance are equally spaced.
A decimal balance uses the lever in which the arm for weights is 10 times longer than the arm for weighted objects, so that much lighter weights may be used to weigh heavy object. [11] Similarly a centesimal balance uses arms in ratio 1:100. For a simple pan balance to be in equilibrium, the fulcrum must be offset from the lever arm.
In physics, Hooke's law is an empirical law which states that the force (F) needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, F s = kx, where k is a constant factor characteristic of the spring (i.e., its stiffness), and x is small compared to the total possible deformation of the spring.
The device consists of a sharp hook suspended from a micrometer cylinder, with the body of the device having arms which rest on the rim of a still well inside the pan. The still well serves to isolate the device from any ripples that might be present in the sample being measured, while allowing the water level to equalize.
An evaporation pan is used to hold water during observations for the determination of the quantity of evaporation at a given location. Such pans are of varying sizes and shapes, the most commonly used being circular or square. [3] The best known of the pans are the "Class A" evaporation pan and the "Sunken Colorado Pan". [4]
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Nevertheless, it is Huygens who is credited with building the first watch to use a balance spring. [105] [106] Hooke's announcement of his law of elasticity using an anagram was a method scientists, such as Hooke, Huygens and Galileo, sometimes used to establish priority for a discovery without revealing details. [107]
If you believe in fairies, there’s a good chance you grew up loving the 1991 film Hook. The Steven Spielberg-directed adventure movie starred the late Robin Williams as Peter Banning, a.k.a. the ...