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- the algebraic sum of the potential rises and drops around a closed loop is zero Current divider KCL KVL Voltage divisionQ5) A solid copper rod is of cross-sectional area 15 mm2 and length 2m. Calculate: a)its change in length when its temperature rises by 30oC b)the force needed to prevent it from expanding by the amount in (a). (given: for steel, the coefficient of linear expansion, α = 12 x 10-6 k-1 and young’s modulus is 2 x 1011 Pa) Assume that the proportional limit is not exceeded.[10] In parallel branches, the current will be the same unless all the resistances are the same. True False [11] Insulators have valence electrons. * two three four None of the above
- 1. An inverted spherical bowl of radius R carries a uniform surface charge density o (see figure on the right). Find the potential difference between the "north pole" and the center. Hint: Find the potential at the north pole and at the center, separately, first. R The olectric notantial of soma confiqurotion is given buL theii. For any complex network containing R, L, C resonance occurs when (a) The imaginary part of Z only equal zero. (b) The imaginary part of Y only equal to zero. iii. In the h-parameters, the two port network is represented by (a) Current equations (c) Voltage equations (c) (a) or (b). (b) Current and voltage equationsTwo wires are welded together end to end. The wires are made of the same material, but the diameter of one is twice that of the other, di = 2 d2. They are subjected to a tension of T= 4.60 N. The thin wire has a length of L2 = 40.0 cm and a linear mass density of 2 = 2.00 g/m. The combination is fixed at both ends and vibrated in such a way that two antinodes are present, with the node between them being right at the weld. (a) What is the frequency of vibration? (b) What is the length of the thick wire, L1 =? N A N A N o d2 L,, µi L2, H2
- The 40 ft. long steel rails on the train track are placed such that there is small gap, 8, between them to allow for thermal expansion. A 100 Ib/yard a rail has a cross-sectional area of 9.80 in?. The steel used has the following material properties: E = 29,000 ksi 6.6 HE/ F (a) What is the size of gap, 8, required so that the rails just touch one another when the temperature increases from -20°F to 100°F. (b) Given the gap you found in (a), what would the axial force in the rails be if the temperature rises to 130°F.The sinusoidal waveform of an ac circuit shows that the: <-90% O the current is leading the applied voltage by 90 O applied voltage is leading the current by 90 O applied voltage is lagging the current by 90 applied voltage is in phase with the currentDetermine the ( internal Di, exteral De and total D) static indclermi nacy OF the Following structure.
- The truss shown in the figure is supported on a roller at B and a hinge at A. Solve for the reaction at A and B. 4m 13m BOLN 3m 4m 4m' • 50%N ROKNProblem 1. A compound beam shown in the figure is fixed at point A, connection at B is a pin and C is a roller. CKM 8kN-m + fast Ga 1. Calculate the reaction at AThe bar ABC in the figure below consists of an AB tube, with an outside diameter of 28 mm and a thickness of 4 mm, connected to a solid bar BC 12 mm in diameter. It is requested to obtain: a) The normal voltage acting on tube AB. b) The normal voltage acting on bar BC.