1- what are radiation protection standards based on (where does the data come from)?

2- What are some of the typical symptoms/injuries from radiation exposure?

(ie fatigue, nausea, blood changes are syptoms of radiation sickness whereas, cataracts, cancers, birth defects, etc. are some possible “injuries” from exposure)

3-What type(s) of effects are the radiation protection standards trying to prevent?

4- In general, how do limits for the general public compare to those for occupational exposure?

pleas type the answe i can not read hand writing

Introduction to Engineering Materials Question:

A beam of light hits a 2.48cm thick silicate glass plate at an angle of 74 degrees (as measured from the normal to the surface of the glass). If the coefficient of linear absorption is 0.027 cm-1 and the index of refraction is 1.488, what fraction of light is passed through the plate. The answer should have three decimals of accuracy.

The figure 2 represents the tower crane used in material handling. Figure 2: Tower Crane

c) How the load is balanced in the mechanism?

d) Explain the working principle of mechanism based on kinematics background

e) Explain the possibility of inversions on the identified mechanism.

8.20 A long composite cylinder is subjected to the external pressure loading as shown in the following figure. A assuming idealized perfect bonding between the two materials, the normal stress and displacement will be continuous across the interface r=r1 (see section 5.2) Under these conditions, determine the stress and displacement fields in each material. Text: Elasticity Third Edition - Martin H. Sadd    There is not figure, EXAMPLE 1.5 is on page 25 from this text.

A noise source produces sound mainly at 2500 Hz and an SPL of 95 dB at the location of a worker. In order to decrease this worker’s noise exposure, the employer decides to build a brick wall (? = 400 kg/m2) between source and worker. What would the sound level at the worker’s location be after the wall is built. Assume that the wall is perfect and that the sound must go through it (not around it).

A Carnot heat engine operates between two thermal reservoirs ( T1 > T2 ) to generate as much power as required as to drive a machine ( input power requirement of 30 kW ) plus to drive an ideal heat pump working between 2 temperature limits ( T3 and T4 ) ( T3 > T4 ) . The pump takes 17 kW of heat from the low temperature reservoir where T1 = 1200K, T2= T3 =335 K, T4 = 278 K. Determine :
1. shaft work output of heat engine.
2. heat intake of heat engine.
2. heat delivered by the heat pump.

please explain in an easy to understand way as my end sem is tomorrow morning. ??

A steam generator consists of a bank of stainless stell (k=15 W/m·K) tubes habing the core configuration of CF7.0-5/8J and an inner diameter of 13.8 mm. The tubes are installed in a plenum whose square cross section is 0.6 m on a side, thereby providing a frontal area of 0.36 m². Combustion gases whose propertires may be aproximated as those of atmospheric air, enter the plenum at 900 k and pass in cross flow over the tubes at 3 kg/s. There are 11 rows of tubes in the gas flow direction. If saturated water at 2.455 bar experiences boiling in the tubes, what is the gas exit temperature? A convection coeficient of 10.000 W/m²·K is associated with boiling in the tubes.

13.0 (20 pts) An electroplating process will be used to coat the exterior surface of a 160 mm diameter x 1.5 meter long cylinder with silver. Determine the time in minutes to electroplate silver to a thickness of 0.06 mm if the plating current is 15 amps.

A system that operates in a reversible cycle receives energy by heat transfer from a 15.7oC reservoir at a rate of 26.9 kW, and delivers energy by heat transfer to a 49.8oC reservoir. Determine the rate of heat transfer (kW) to the high temperature reservoir.

An insulated tank containing 0.5m3 of R-134 at 500 kPa and 90% quality is connected to an initially evacuated insulated piston-cylinder device. The force balance on the piston is such that a pressure of 120kPa is required to lift the piston. The valve is then opened slightly and part of the refrigerant flows to the cylinder, pushing the piston up and the final cylinder volume is 1.5 m 3 . The process ends when the pressure in the tank drops to 120kPa. Assume the refrigerant in the tank undergoes an isentropic process. (a) Determine the quality in the tank and the cylinder. 0.896, 0.92 (b) Calculate the boundary work 280.8 kJ (Expansion) (c) Determine the entropy generated during the process 0.1973 kJ/K

Metal hydrides are metal alloys that can store significant quantities of hydrogen in their atomic lattice. For this reason, they are considered potentially attractive for the on-board storage of hydrogen for hydrogen fuel cell vehicles. A certain metal hydride alloy can store 2 wt% hydrogen and has a density (including the hydrogen) of 12 g?cm3. Treating hydrogen as an ideal gas, what pressure would beneeded tocompressgaseous hydrogen tothesameequivalent concentration thatit attains when absorbed in the metal hydride?

a. Why are commercial or any aircraft that fly at altitude, pressurized?

b. What is Pascal’s pressure assumption?

c. What are typical pressures used within commercial aircraft?

d. Explain air pressure and why it is higher at sea level than at high altitudes, support with diagrams if needed. (Hint, in a room is the cold air, it is at the floor. Is its density greater than hot air?)

A gas turbine operates as a cold-air standard Brayton cycle. Air enetrs the compressor at 300K and 100kPa and is compressed to 700kPa. During the heat addition process in the combustor, the temperature of the air increases to 1000K. The turbine and compressor can be assumed to be operating isentropically. Evaluate specific heat at 300K.

a. thermal efficiency of the cycle?

b. net work of the cycle (kj/kg)?

c. Back work ratio?

A counter-flow double-pipe heat exchanger is heating water from 20 to 80 C at a rate of 1.2 kg/s. The heating is provided by water at 160 C and a rate of 2 kg/s. The inner tube has a diameter of 1.5 cm, and the U is 640 W/m2 K. Use the effectiveness-NTU method to determine the length of the heat exchanger required.

List the Social and Economic issues of with respect to power plant