In the manufacturing of soluble coffee, after roasting and grinding the coffee, a syrup is prepared from the mixture of the ground beans with hot water. This process is called extraction. The extract that comes out of the extractor contains 30% of solids. After extraction, the solution obtained (extract) is sent to an evaporator, where it is concentrated. The concentrated extract goes to a "spray" type dryer, where soluble coffee beans are obtained with 5% water. As during the evaporation process much more aroma is lost than during the drying process, an interesting alternative is to subdivide the extract into two streams, in which one goes through the evaporator and the other is sent directly to the dryer. Consider the process feed of 1000 kg/h. In this way, if 1/5 of the extract is deviated, determine: a) the amount of coffee and the concentration of solids in the outlet of the evaporator, so that the dryer feed has 55% of solids;
b) the amount of coffee fed into the dryer;
c) the amount of soluble coffee obtained after drying (product).

Chapter 23, problem 075 the figure shows a geiger counter, a device used to detect ionizing radiation (radiation that causes ionization of atoms). the counter consists of a thin, positively charged central wire surrounded by a concentric, circular, conducting cylindrical shell with an equal negative charge. thus, a strong radial electric field is set up inside the shell. the shell contains a low-pressure inert gas. a particle of radiation entering the device through the shell wall ionizes a few of the gas atoms. the resulting free electrons (e) are drawn to the positive wire. however, the electric field is so intense that, between collisions with gas atoms, the free electrons gain energy sufficient to ionize these atoms also. more free electrons are thereby created, and the process is repeated until the electrons reach the wire. the resulting "avalanche" of electrons is collected by the wire, generating a signal that is used to record the passage of the original particle of radiation. suppose the radius of the central wire is 24 âµm, the inner radius of the shell 2.3 cm, and the length of the shell 14 cm. if the electric field at the shell's inner wall is 2.8 ă— 104 n/c, what is the total positive charge on the central wire?

Could someone . i have tried to solve myself but my calculation is off

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.