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Two concentric circular coils X and Y of radii 16 cm and 10 cm, respectively, lie in the same vertical plane containing the north to south direction. Coil X has 20 turns and carries a current of 16 A; coil Y has 25 turns and carries a current of 18 A. The sense of the current in X is anticlockwise, and clockwise in Y, for an observer looking at the coils facing west. Give the magnitude and direction of the net magnetic field due to the coils at their centre.
An object 1.00" high is placed 2.00" in front of a concave mirro f radius 4.00" Find p and q. Show work/picture. Locate and describe the image
A boy coasts down a hill on a sled, reaching a level surfaceat the bottom with a speed of 7.1 m/s. how far does the sledtravel on the level surface before coming to rest
A convex lens is held over a piece of paper outdoors on asunny day. When the paper is held 26 {\rm cm} below the lens, the sunlight is focused on the paper and the paperignites. What is the focal length of the lens?
Small rockets are used to make small adjustments in the speed of satellites. One such rocket has a thrust of 53 N. If it is fired to change the velocity of a(n) 66000 kg space craft by 99 cm/s, how long should it be fired? Answer in units of s.
A Carnot engine works between temperatutes T1 = 495K and T2 = 302K. What is the Carnot coefficient of performance, KC, of the refrigerator
A molecule of DNA (deoxyribonucleic acid) is 2.28 µm long. Determine the effective spring constant of the molecule
questionassume early universe was composed only of helium instead of hydrogen. a estimate the temperature of cmb when
an initially stationary block of mass m on a floor. A force of magnitude F = 0.580·mg is then applied at upward angle ? = 16°. What is the magnitude of the acceleration of the block across the floor if (a) ?s = 0.600 and ?k = 0.500
q1. a weather vane at first at rest has a moment of inertia of 0.111 kg bull m2 about its axis of rotation. a 53.0 g
A painter (m=70 kg) is standing a distance of 0.6 m from the top of a ladder (mass 40 kg and length 2.5 m). Find the conditions for static equilibrium of the ladder with the painter on top
A set of crash tests consists of running a test car moving at a speed of 11.8 m/s (26.4 mi/hr) into a solid wall. Calculate the size of the average force which acts on the dummy during that time
Air in a balloon does 46 J of work while absorbing 94 J of heat. What is the change in internal energy
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