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A 4-m x 5-m x 7-m well-sealed room is to be heated by 1500 kg of liquid water contained in a tank that is placed in the room. The room is losing heat to the outside air at 5°C at an average rate of 10,000 kJ/h. The room is initially at 20°C and 100 kPa and is maintained at a 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
(a) The minimum temperature of the water when it is first brought into the room and
(b) The entropy generated during a 24-h period. Assume constant specific heats for both air and water at room temperature.
A particle has a charge of +1.7 ?C and moves from point A to point B, a distance of 0.12 m. The particle experiences a constant electric force, and its motion is along the line of action of the force. The difference between the particle's electric..
A charge of -2.85 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.105 m.
An unstrained horizontal spring has a length of 0.34 m and a spring constant of 290 N/m. obtain the possible algebraic signs
A uniform rod of mass M and length L can pivotfreely (i.e., we ignore friction) about a hinge attached to a wall,as in Fig. 8–54. The rod is held horizontally and thenreleased.
A particle is acted on by 2 torques about the origin: has a magnitude of 2.0Nm and is directed in the positive direction of the x axis, and has a magnitude of 4.0Nm and is directed in the negative direction of the y axis. In unit-vector notation, fin..
Describe normal anatomy/physiology of muscle contraction emphasizing the utilization of ATP in this process - Describe the difference between fast oxidative, slow oxidative, and fast glycolytic fibers.
An electron is moving at 3 x 105 m/s in the positive x direction. A magnetic field of .8 T is in the positive z direction. The magnetic force is what on the electron? Need magnitude and direction ( i.e. pos/neg z direction, pos/neg y direction)
An underwater diver sees the sun 55 degrees above horizontal. How high is sun above the horizon to a fisherman in a boat above the diver.
you are the navigator of a ship at sea. you receive radio signals from two transmitters a and b which are 94.0 km apart
A parallel-sided plate of glass having a refractive index of 1.58 is in contact with the surface of water in a tank. What angle does this ray make with the normal in the water
A doctor examines a mole with a 15.7 cm focal length magnifying glass held 11.9 cm from the mole. How far is the image from the lens
An object is solid throughout. When the object is completelysubmerged in ethyl alcohol, its apparent weight is 14.8 N. What is the volume of the object
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