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The air in a building is to be maintained at 25°C and 55% relative humidity by passing outside air through a water spray. The air enters the spray chamber at 32°C and 70% relative humidity, leaves the chamber cooled and saturated with water vapor, and is then reheated to 25°C. Estimate the temperature of the air leaving the spray chamber and the water (kg) added to or removed from (specify which) each kilogram of dry air processed.
A box contains about 7.27 × 1021 hydrogen atoms at room temperature 21oC. Obtain the thermal energy of these atoms
A string trimmer is a tool for cutting weeds and grass; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. Determine what is the length of the rotating string
a pair of hedge trimmers are 45 cm long from the pivot to the end of the handles. if the person applies of a force of
a parallel-plate capacitor in air has a plate separation of 1.64cm and a plate area of 24.8cm2. the plates are charged
a copper rod is sliding on two conducting rails that make an angle of 19deg with respect to each other as in the
question the electric potential at a point that is halfway between two identical charged particles is 300 v. what is
a bowling ball has a mass of 7.2 kg and radius of 0.11m. a billiard ball has a mass of 0.38 kg and a radius of 0.028 m.
a bat emits a sound whose frequency is 88.1 khz. the speed of sound in air at 20.0 oc is 343 ms. however the air
A 66.0 kg bungee jumper, tied to a 30.0 m long cord, leaps off a bridge whose deck is 60.0 m above the water. He falls to 8.0 m above the water before the bungee cord pulls him back up. What is the magnitude of the impulse exerted on the bungee jumpe..
You attach a meter stick to an oak tree, such that the top of the meter stick is 2.67 meters above the ground. how high above the ground was the acorn before it fell
Two packing crates of massesm1= 10.0kg and m2=7.00 are connected by a light string that passes over a frictionless pulley, Find the acceleration of the 7.00 kg crate
while the tilt angle theta equals 75 degrees is held constant, the load is slowly lifted vertically by a winch until the length of the vertical cable is negligible, and the load mass effectively sits at the upper end of the beam.
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