Physics, 24.03.2021 08:50 cristinaarmijo1
Suppose you have two planes A and B both traveling at a constant velocity. Let's say A travels at a velocity of (-i+6j) m/s, and B at (3i+4j) m/s, and when t=0, plane A has a position vector of (2i-10j) m, and plane B has a position vector of (-26i+4j) m.
a) At what time will these planes collide?
b) In what position will the planes collide?
Answers: 3
Physics, 22.06.2019 06:20
Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?
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Physics, 22.06.2019 11:30
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Physics, 22.06.2019 13:30
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Physics, 22.06.2019 15:00
Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive
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Suppose you have two planes A and B both traveling at a constant velocity. Let's say A travels at a...
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