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A heat pump delivers 34.0 kW to heat a house. The outside temperature is -9.0°C and the inside temperature of the hot-air supply for the heating fan is44.0°C. What is the coefficient of performance of a Carnot heat pump operating among these temperatures? Note that a heat pump is like a refrigerator by the output of the hot reservoir serving as the source of heat.
What should be the minimum power of the engine needed to run the heat pump?
If the efficiency is 70.0% of a Carnot engine, what should be the minimum power of the pump?
Explain the construction of a electromagnetic velocity sensor and explain its working. In a bike speedometer the wheel diameter is 80cm what is the frequency of velocity sensor, which gives 1 pulse per rotation of wheel at a speed of 80Km/H?
A block is placed at the end of the frictionless ramp and is pulled up the ramp through a solid ball on the end of a string that passes over a frictionless pulley that does not affect the motion of the block or ball. The ramp is 3.40 meters long and ..
q1. a loudspeaker is placed between two observers who are 120 m apart along line connecting them. if one observer
Two loud speakers face each other, vibrate in phase, and produceidentical 451 Hz tones. A listening walks from one speakertoward the other at a constant speed and hears the loudness change(loud-soft-loud) at a frenquency of 2.84 Hz.
the specific gibbs function of a gas is given by g rt ln ppo-ap where a is a function of t. find expressions fora the
the microwave radiation left over from the big bang explosion of the universe has an average energy density of 3.88
Assume the following waves are propagating in air. Calculate the wavelength for gamma rays of frequency f_1= 7.40×1021 Hz
A star with the same mass and diameter as the sun rotates about a central axis with aperiod of about 28.4 days. What would be the new rotation period (s) of the star
A long straight wire is aligned north-south and carries current in the northerly direction. What is the direction of the magnetic field created directly above the wire
When responding to sound, the human eardrum vibrates about its equilibrium position. What is the maximum acceleration of the eardrum
A 2 kg object is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of 20.0 N is needed to hold the object at rest when it is pulled 0.200 m from its equilibrium position.
At t = 0, a 755 g mass at rest on the end of a horizontal spring (k = 124 N/m) is struck by a hammer, which gives it an initial speed of 2.73 m/s. Determine the position as a function of time
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