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A force of 2.5kN is needed to lift a load. How much work is done if the load is lifted by 500cm?
An electromagnet exerts a force of 12N and moves a soft iron armature by a distance of 1.5cm in 40ms. Find the power consumed.
A mass of 500kg is raised to a height of 6m in 30s. Find
(a) the work done and
(b) the power developed
A simple rotation machine Secure a breast-drill or hand- drill like as the one shown in the diagram. Clamp a small screw eye or cup hook in the chuck of the drill. Join a 30 cm
Your friend has gifted an earphone set to you. While music is on you will try to oppose the two ear phone pieces to attract. Task-I: Will they attract? If yes, why so? Task-II: Why
What is radium used for? Radium was formerly used in self-luminous paints for nuclear panels, watches, aircraft switches, clocks, and instrument dials. More than 100 former wat
Q Define threshold frequency? The minimum frequency of incident radiation lower which the photoelectric emission isn't possible completely but high the intensity of incident r
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The half-life of an isotope of an element is 5 days. The mass of a 10 gram sample of this isotope remaining after 20 days is: a) 0.312 grams b) 0.625 grams c) 1.25 g
Q. Show the use of Fire extinguisher? Ans: a) Pull the pin at the top of the extinguisher. b) Aim the nozzle towards the base of the fire. c) Stand approximately 8
What is the luminous flux of a flashlight that provides an luminance of 145 lx to the surface of water when held 0.50 m above the water?
The refractive index of glass is 1.54. Determine the polarizing angle when light goes from glass to air medium?
ELECTROMOTIVE FORCE – EMF: To make use of electricity by provision of an electric current, the potential different must be maintained. That is, the positive and negative charg
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