4. A first-order reaction is 24.0% complete in 19.7 minutes. (a) Compute the rate constant for the reaction in units of min-¹. (b) How long in minutes will the reaction take to be 85.5% complete?
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- Please include solution. Thank you!The efficiency of a nuclear power plant is 36.1.0 %. If 280.16.0 kW of power are produced by the nuclear fission, what is the electric power output of the plant? Please give your answer in kilowatts with one decimal place.5. The N pole faces of two cylindrical neodynium magnets having a radius of 0.5 cm and a length of 20 cm are brought together so that their faces are parallel and there is a small gap between them. The magnetic surface charge density on each pole face is 2 x 10° Cm's. (a) What is the force between the magnets in the limit in which the gap goes to zero? -Assume that the magnets are much longer than shown in the figure below, so that you only need to concern yourself with the repulsion between N and N. (b) What is the force between the magnets when they are separated by 0.5 m? At this separation you can approximate the four pole faces as point-charges.
- can you explain the question plsAnswer 7 and 8 Handwritten then box the final answer27. A shielded vial with a 1-mm thick lead shield contains Tc. If A. 11.8 mR/hr В. 23.5 mR/hr C. 47 mR/hr D. 94 mR/hr the unshielded sample yielded an exposure rate of 188 mR/hr, what will the exposure rate be from the shielded vial? (The lead HVL for Tc is 0.25 mm.) 28. If "Co gives an exposure rate of 38 R/hr at 2 m, at least how А. 2 В. 3 many HVLS of concrete shielding are required to reduce this exposure to below 2 R/hr at the same distance? (The concrete HVL for "Co is 6.2 cm.) С. 4 D. 5
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