Physics, 06.02.2020 02:45 whatsupp123
The light-gathering power of a telescope is directly related to the area of the telescope's primary mirror. a mirror with four times the diameter of another mirror collects how many times more light as the smaller mirror does in the same amount of time?
Answers: 3
Physics, 21.06.2019 21:00
An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?
Answers: 2
Physics, 22.06.2019 11:30
If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal
Answers: 1
Physics, 22.06.2019 19:00
Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe
Answers: 1
Physics, 23.06.2019 00:40
Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*
Answers: 1
The light-gathering power of a telescope is directly related to the area of the telescope's primary...
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