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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 string of length 0.276 m is fixed at both ends. The string is plucked and a standing wave is set up that is vibrating at its second harmonic. What is the frequency of vibration
a motorcycle is following a car that is traveling at constant speed on a straight highway. initially the car and the
a transverse wave travels on a string in the positive x-direction. the tension in the string is 200 n and the linear
In a diesel engine, the piston compresses air at 302 K to a volume that is 0.0623 of the original volume, What is the temperature of the air after the compression
We wish to coat flat glass (n 1.50) with a transparent material (n 1.25) so that reflection of light at wavelength 600 nm is eliminated by interference. What minimum thickness can the coating have to do this
A -3.4 nC charge is on the x-axis at x1 = -7 cm and a 4.2 nC charge is on the x-axis at x2 = 13cm. At what point or points on the y-axis is the electric potential zero
A 25-kg box slides, from rest, down a 9.0-m-long incline that makes an angle of 15° with the horizontal. What is the change in the potential energy of the box
One end of a uniform rod of length 4L and weight Fg is supported by a cable. Determine the minimum distance, x from the wall, at which an additional object of weight Fg can be hung without causing the rod to slip
During each heartbeat, approximately 68 cm3 of blood is pushed from theheart at an average pressure of 105 mm-Hg. Calculate the power output of the heart
A sphere of mass 86 kg is attached to one end of a rope. It is found that the rope does an amount of work W = 8130 J in pulling the sphere upward through a distance 9.6 m. Find the work done by the force of gravity on the sphere
A dog running in an open field has components of velocity vx = 3.5m/s and vy = -1.4m/s at time t1= 10.7s. For the time interval from t1 = 10.7s to t2= 19.1s, What is the magnitude of the dog's velocity
Calculate the Q-value, recoil energy of the daughter nucleus and the kinetic energy of the alpha particle in the following alpha decays
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