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A 5-m = 6-m = 8-m room is to be heated by an electric resistance heater placed in a short duct in the room. Initially, the room is at 15°C, and the local atmospheric pressure is 98 kPa. The room is losing heat steadily to the outside at a rate of 200 kJ/min. A 200-W fan circulates the air steadily through the duct and the electric heater at an average mass flow rate of 50 kg/min. The duct can be assumed to be adiabatic, and there is no air leaking in or out of the room. If it takes 15 min for the room air to reach an average temperature of 25°C, find
(a) The power rating of the electric heater and
(b) The temperature rise that the air experiences each time it passes through the heater.
Draw a circuit with a 12 V battery and two resistances of 6 and 8 connected in series. Place an ammeter in the circuit to measure the current in the six resistors and a voltmeter to measure the voltage across the eight resistors. Compute the current ..
A horizontal spring is lying on a frictionless surface. One end of the spring is attached to a wall, What is the speed of the object at the instant when the spring is stretched by0.042 m relative to its unstrained length
You are driving east on 8th Street (Tamiami Trail) at a speed of 32. In the rearview mirror, What is the frequency of the siren
gravitational infall calculate the required mass accumulation rate to the present sun from r 8 to r rs radius of sun
modern vacuum pumps make it easy to attain pressures of the order of 10?13atm in the laboratory.part aat a pressure of
Two long, parallel wires separated by 5.00 cm carry currents in opposite directions. Find the magnitude of the force per unit length
An ideal gas is at a temperature of 30 degrees C, find the number of particles per unit volume of the gas
Two masses, m1 = 25.0 kg and m2 = 45.0 kg, are attached by a mass less rope over a mass less pulley, Determine how much work is done by gravity on m2 as it falls
a bunch of metal plates each with either one or two small slits cut in them have been mixed up and you have been
A converging lens with a focal length of 13 centimeter forms a virtual image 7.60 millimeter tall, 16.6 centimeter to the right of the lens. Evaluate what the position of the object
An AC generator consists of 8 turns of wire in a loop or coil, the cross-sectional area of the loop is A=0.09 m2, with a total resistance of 12Ω. The loop is rotating in a magnetic field B=0.5T at a constant rate of 60Hz.
Freud believed that certain troubling symptoms might be traced to painful unconscious memories. This led him to suspect that these symptoms resulted from.
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