Engineering, 17.12.2019 20:31 ineedtopeebeforethec
Some aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness
of 35 mpa m (31.9 ksi in. ). it has been determined that fracture results at a stress of 250 mpa (36,250 psi)
when the maximum (or critical) internal crack length is 2.0 mm (0.08 for this same component and alloy, will
fracture occur at a stress level of 325 mpa (47,125 psi) when the maximum internal crack length is 1.0 mm (0.04
why or why not?
Answers: 3
Engineering, 04.07.2019 18:10
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?
Answers: 1
Engineering, 04.07.2019 18:20
Steam enters a converging nozzle at 3.0 mpa and 500°c with a at 1.8 mpa. for a nozzle exit area of 32 cm2, determine the exit velocity, mass flow rate, and exit mach number if the nozzle: negligible velocity, and it exits (a) is isentropic (b) has an efficiency of 94 percent
Answers: 2
Engineering, 04.07.2019 19:10
The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object
Answers: 1
Engineering, 04.07.2019 19:10
Aplate of dimensions 3 m x 3 m is placed 0.37 mm apart from a fixed plate. the plate requires a force of 2n to move at speed of 45 cm/s. evaluate the viscosity of the fluid in between the plates
Answers: 3
Some aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughn...
Mathematics, 09.01.2021 07:40
English, 09.01.2021 07:40
Mathematics, 09.01.2021 07:40
Mathematics, 09.01.2021 07:40
Mathematics, 09.01.2021 07:40
Physics, 09.01.2021 07:40
Mathematics, 09.01.2021 07:40
Health, 09.01.2021 07:40
Arts, 09.01.2021 07:40
Chemistry, 09.01.2021 07:40
Mathematics, 09.01.2021 07:40
Advanced Placement (AP), 09.01.2021 07:40
Mathematics, 09.01.2021 07:40