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A 4-m X 5-m X 6-m room is to be heated by one ton (1000 kg) of liquid water contained in a tank that is placed in the room. The room is losing heat to the outside at an average rate of 8000 kJ/h. The room is initially at 20°C and 100 kPa and is maintained at an average temperature of 20°C at all times. If the hot water is to meet the heating requirements of this room for a 24-h period, determine the minimum temperature of the water when it is first brought into the room. Assume constant specific heats for both air and water at room temperature.
A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 395 kV. If the upgraded transmission lines have the same resistance, what is the ratio of new line power loss to old
a segment of wire carries a current of 25 a along the x axis from x -2.0 m to x 0 and then along the z axis from z0 to
A person in an elevator is holding a 25 kg block by a cord rated to withstand a tension of 335 N. Starting from rest, the elevator begins to move upwards at a constant acceleration and the cord holding the block breaks. What was the least accelera..
A 690-kg elevator starts from rest and moves upward for 3.50 s with constant acceleration until it reaches its cruising speed, 1.85 m/s. What is the average power of the elevator motor during this period
Suppose 1.85 x 1020 electrons move through a pocket calculator during a full day's operation.How many coulombs of charge moved through it
A daredevil is shot out of a cannon at 45.0° to the horizontal with an initial speed of 26.0 m/s. At what height above the cannon should the net be placed in order to catch the daredevil
what formula do i use to find electric potential? units? what formula do i use to find potential energy? units? if you
A straight wire, 0.5 m long, is moved straight up at a speed of 20 m/s during a 0.4-T magnetic field pointed in the horizontal direction. What EMF is induced in the wire?
A jet airplane is in level flight. The mass of the airplane is m = 8910 kg. What is the magnitude of the lift force acting on the plane
A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius 11.0 m. What is her speed as she goes through the dip
A net force along the x-axis that has x-component Fx = -12.0N + (0.300N/m2)x2 is applied to a 3.10kg object that is initially at the origin and moving in the -x-direction with a speed of 7.7m/s. What is the speed of the object
a particle of mass 0.350 kg is attached to the 100 cm mark of a meter stick of mass 0.150 kg. the meter stick rotates
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