50 how far apart are the object and the image a 125

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Unformatted text preview: 5.0 Ω. It is melted down, and from the same volume of metal, a wire is made that is four times longer than the original wire. What is the resistance of the new wire? a. 1000 Ω b. 560 Ω c. 780 Ω d. 920 Ω 81. A diverging lens with a focal length of 25 cm has a magnification of 0.50. How far apart are the object and the image? a. 12.5 cm b. 25 cm c. 10 cm d. 15 cm Page 12 of 15 ©Prep101 82. Three objects m1, m2, and m3 are suspended from three massless and frictionless pulleys as shown in the diagram. m1 is 6 kg, m2 is 2 kg, and m3 is 3 kg. Find the tension of the string when the system is set in motion (i.e. all masses are moving). (This question is too hard to be on the MCAT, but it is good practice) 84. The near point of a person is 50cm. The image forms behind the retinal for images closer than 50 cm. To correct this problem, what refractive power must a corrective lens have to enable the eye to see an object at 10cm away clearly? I 0 at p<pnear I a. b. c. d. 0 at p<pnear 11.3 N 12.1 N 13.5 N 15.7 N 83. A rod of 2.0 m length and square cross-section (2.0 mm x 2.0 mm) is made of a material with a resistivity of 6.0 x 10 Ωm. If a potential difference of 0.5 V is established across the ends of the rod, at what rate in W is heat generated in the rod? a. 3.0 b. 5.3 c. 8.3 d. 1.3 a. b. c. d. -8.0 dpt -2.0 dpt 2.0 dpt 8.0 dpt 85. The atomic mass of 9Be is 9.012186 u. That of 4 He is 4.002604u, and of 13C 13.003354u. Calculate the energy (in MeV) released by the reaction: 9Be + 4He → 13C a. 10.7 MeV b. 12.3 MeV c. 8.6 MeV d. 15.7 MeV 86. If an object which is attached to a horizontal spring is released from rest and distance +A from equilibrium position of the spring, then a. The formula E = 1/2 kx2 + mgx describes the total energy of the object b. The formula E = ½ kA describes the maximum potential energy of the object c. The formula E = ½ kA2 describes the total energy of the object d. The formula F = -kx2 describes the elastic force (restoring force) acting o...
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This note was uploaded on 03/23/2011 for the course CHEM 100 taught by Professor Vallis during the Spring '11 term at Dalhousie.

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