Physics, 05.08.2019 21:30 kyleereeves2007
Let i represent a displacement 1 km due east and j represent a displacement 1 km due north. the control tower of an airport is at (0, 0). aircraft within 100 km of (0, 0) are visible on the radar screen at the control tower. at 12 : 00 noon an aircraft is 200 km east and 100 km north of the control tower. it is flying parallel to the vector b = -3i - j with a speed of 4010−−√ km h−1. at what time will the aircraft disappear from the radar screen
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Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.
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Let i represent a displacement 1 km due east and j represent a displacement 1 km due north. the cont...
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