A passenger of mass m stands on a platform scale in an elevator cab. We are concerned with the scale readings when the cab is stationary and when it is moving up or down. (a) Find the scale reading, whatever the vertical motion of the cab. (Show all steps of your derivation of any results) and, If m = 80.5 kg, (b) what does the scale read if the cab is stationary or moving upward at a constant velocity 0.80 m/s?, (c) What does the scale read if the cab accelerates upward at 4.50 m/s2 and downward at 5.30 m/s2?, (d) During the downward acceleration in part-(c), what is the magnitude of the net force on the passenger, and what is the magnitude of his acceleration as measured in the frame of the cab? Thus using the newton’s second law, prove that frame of the cab is non-inertial?, (e) If the elevator cab and its load have a combined mass of 1600 kg, find the tension in the supporting cable when the cab is moving with a upward acceleration given in part-(c).

An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of where qin is the refrigerator cooling rate, qout is the heat rejection rate, and is the power input. show that copm can be expressed in terms of the reservoir temperatures tc and th, the cold and hot thermal resistances rt, c and rt, h, and qin, as where rtot rt, c rt, h. also, show that the power input may be expressed as 1.39 a household refrigerator operates with cold- and hot-temperature reservoirs of tc 5 c and th 25 c, respectively. when new, the cold and hot side resistances are rc, n 0.05 k/w and rh, n 0.04 k/w, respectively. over time, dust accumulates on the refrigerator’s condenser coil, which is located behind the refrigerator, increasing the hot side resistance to rh, d 0.1 k/w. it is desired to have a refrigerator cooling rate of qin 750 w. using the results of problem 1.38, determine the modified coefficient of performance and the required power input w under (a) clean and (b) dusty coil conditions. internally reversible refrigerator qout qin w high-temperature reservoir low-temperature reservoir th th, i tc, i tc high-temperature side resistance low-temperature side resistance w qin th tc qinrtot tc qinrtot copm tc qinrtot th tc

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?

Ais a multilevel way of grouping items based on common properties among them. a. memory b. conceptual hierarchy c. schema d. semantic network