Air enters a cooling coil at the rate of 2.35 m/s at dbt 27°c db, 53% rh and sea-level pressure. the air leaves the coil at dbt 13°c and 89% rh. (a) compute the total and sensible heat transfer rates for the air. (b) determine the coil shf and apparatus dew point temperature.

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".