Physics, 01.10.2019 17:10 jahnoibenjamin
K) a stream of warm water is produced in a steady-flow mixing process by combining 1.0 kg s-1of cool water at 25°c with 0.8 kg s-1of hot water at 75°c. during mixing, heat is lost to the surroundings at the rate of 30 kj s-1. what is the temperature of the warmwater stream? assume the specific heat of water constant at 4.18 kj kg-1k-1
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Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".
Answers: 3
K) a stream of warm water is produced in a steady-flow mixing process by combining 1.0 kg s-1of cool...
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