Engineering, 25.11.2020 14:20 shadowsnake
The drag force FD on an airplane is a function of its velocity V , its length L, and the air density rho. The drag force is 0.3 N, when tested with a model plane at sea level, with a wind velocity of 10 m/s. What will be the drag force on a prototype that is 15 times larger and is traveling at 200 m/s at an altitude of 3 km?
Answers: 3
Engineering, 04.07.2019 18:10
If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79
Answers: 1
Engineering, 04.07.2019 18:10
Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan
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
Engineering, 04.07.2019 19:10
Afoot bridge is made as a simple deck, 4 m long, with a cross section 2 m (wide) and 20 cm thick, and made of wood. the deck is supported at the two ends. the maximum load allowable on the bridge is 10 tons, provided it is uniformly distributed on the deck. to sense this load, a strain gauge is placed at the center of the bridge and its resistance is monitored. if the sensor has a nominal resistance of 350 s2 and a gauge factor of 3.6, what is the reading of the strain gauge at maximum load? the modulus of elasticity for the wood used in the construction is 10 gpa.
Answers: 2
The drag force FD on an airplane is a function of its velocity V , its length L, and the air density...
Mathematics, 21.08.2019 05:00
Social Studies, 21.08.2019 05:00
Social Studies, 21.08.2019 05:00
Physics, 21.08.2019 05:00
Social Studies, 21.08.2019 05:00
English, 21.08.2019 05:00
Computers and Technology, 21.08.2019 05:00
Mathematics, 21.08.2019 05:00
Geography, 21.08.2019 05:00