Application of Differential Equation A zircon sample contains 4000 atoms of the radioactive element 235U given that 235U has a half-life of 700 million years, how long would it take to decay to 125 atoms?

Application of Differential Calculus A zircon sample contains 4000 atoms of the radioactive element 235U given that 235U has a half-life of 700 million years, how long would it take to decay to 125 atoms?

From the test specifications given in Table 5.2(attached), show that thecompactive energy in method C is 2700 kN. m/m3.

Given the following data: Weight of a dish = 55.8633 g, 200mL of sample is placed in the dish and evaporated. New weight of dish and dry solids = 55.8856 g. The dish is placed in a 550°C furnace, then cooled. New weight = 55.8700 g.   Find the total, volatile, and fixed solids.

A teapot with a surface area of 665 cm2 is to be plated with silver. It is attached to the negative electrode of an electrolytic cell containing silver nitrate (Ag+ NO3−). The cell is powered by a 12.0-V battery and has a resistance of 1.30 Ω. If the density of silver is 1.05  104 kg/m3, over what time interval does a 0.133-mm layer of silver build up on the teapot?

The half-life of cesium-137 is 30 years. Suppose we have a 60-mg sample. (a) Find the mass that remains after t years.y(t) =    (b) How much of the sample remains after 60 years? (Round your answer to two decimal places.) (c) After how long will only 1 mg remain? (Round your answer to one decimal place.)t =

The electric charge (in Coulombs, C) in a spherical surface leak at a rate proportional to the amount present. The initial charge is 7C and 2/5 of it leaks off in 15 minutes. Which of the following is the particular solution? 14/5 exp(-0.06108604879t) 7   exp(-0.03405504158t) 14/5 exp(-0.03405504158t) 7 exp(-0.06108604879t) At what time will the charge be half of its original value?   20.35 mins 13.35 mins 18.35 mins 11.35 mins

A centrifuge bowl with internal diameter of 150mm is turning at 8000r/min is used to separate chlorobenzene, with a density of 1109 kgm3, from an aqueous wash liquid having a density of 1020 kgm3. The free liquid surface inside the bowl is 40mm from the axis of rotation. If the centrifugal bowl is to contain equal volumes of the two liquids, what should be the radial distance from the rotational axis to the top of the overflow dam for heavy liquid