The electrostatic force (F) between two plates of a charged capacitor is directly proportional to the product of the charges ( and ) on each plate and inversely proportional to the square of the distance (d) between the plates.

A.
B.
C.
D.


Answer: D

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An insulated air compressor receives 0.25 kg/s of air at 100 kPa and 20°C. The air is compressed to 900 kPa. For exit temperatures ranging from 290°C to 400°C, use your compressor model to plot the power required by the compressor. (The higher the exit temperature, the less efficient the compressor is.)

Given: P1 = 100 kPa; T1 = 20°C; m?= 0.25 kg/s; P2 = 900 kPa; Air (Take State 1 as the inlet, State 2 as the outlet.) Assume: Q?=0 (insulated). For a compressor, assume steady-state, steady-flow, single-inlet, single-outlet flow, with ?KE = ?PE = 0 What will be an ideal response?

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What is the motor full-load current for a motor with a nameplate rating of 50hp, 460V, 3Ø?

a. 52A b. 65A c. 81A d. 130A

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Determine the work output of the heat engine sketched in the figure.


A) 400 kJ
B) 300 kJ
C) 200 kJ
D) 100 kJ

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La herramienta de la figura provista es un(a):

a. localizador de centro de tubería. b. micrómetro. c. herramienta de alineación de tubería. d. separador de bridas.

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