Engineering, 26.07.2021 14:50 xojade
hãy trình bày những hiểu biết của bản thân về các nội dung cho trẻ khám phá về môi trường xung quanh. lấy ví dụ minh họa để chứng minh nội dunh cho trẻ khám phá khoa học được cấu trấu theo hướng đồng tâm
Answers: 1
Engineering, 04.07.2019 18:10
During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false
Answers: 2
Engineering, 04.07.2019 18:10
Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.
Answers: 3
Engineering, 04.07.2019 18:10
An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0
Answers: 3
Engineering, 04.07.2019 18:20
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
hãy trình bày những hiểu biết của bản thân về các nội dung cho trẻ khám phá về môi trường xung quanh...
Mathematics, 21.07.2021 22:20
Chemistry, 21.07.2021 22:20
Mathematics, 21.07.2021 22:30
Mathematics, 21.07.2021 22:30
English, 21.07.2021 22:30
Biology, 21.07.2021 22:30
Mathematics, 21.07.2021 22:30
Mathematics, 21.07.2021 22:30
Mathematics, 21.07.2021 22:30