En un experimento llevado acabo en el laboratorio de física , se utilizo un posicionador cuántico para mover a cualquier posición cargas puntuales. Utilizando esa herramienta se posicionaron dos cargas en el espacio, la primera, de 40 nC en la posición (3.0 m, 4.0 m, 0.0 m) y la segunda de -35 nC en la posición (-2.0 m, 3.0 m, 0.0 m). Posteriormente se le requiere que se mida el campo eléctrico generado en un punto (0.0 m, 5.0 m, 0.0 m) y brinde la dirección mediante un vector unitario.

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.