Refrigerant entering the compressor of a refrigeration system is sub-cooled liquid
The liquid refrigerant is sub-cooled to ensure that only liquid and not the vapour enters the throttling valve. In a refrigeration system, the superheating decreases COP increase refrigerating effect but increasing amount of work done. The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.
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Explanation:
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Answer:
W= 1812.6 J
Explanation:
Work (W) is defined as the scalar product of force F by the distance (d) the body travels due to this force.
W= F*d* cosα Formula ( 1)
Where:
F is the force in Newtons (N)
d is the displacemente in meters (m)
α : Angle formed between force and displacement
Data
F = 10 N
d = 200 m
α = 25°
Work done by the pulling force while the passenger walks 200 m
We replace data in the formula (1)
W= F*d* cosα
W= (10 N)*(200 m)* cos25°
W= 1812.6 (N*m)
W= 1812.6 J
Answer:
A. burn the coal
Explanation:
Burning the coal is only the way to convert the stored chemical energy of the coal into the the kinetic energy of its molecules that can then be transferred to the nearby objects in the form of heat by the various modes of heat transfer such as conduction, convection or radiation.
Conduction is the contact method of heat transfer in which the adjacent atom transfers the vibration kinetic energy.
Convection is the bulk mode of heat transfer in which the bulk mass of molecules moves near and far to the heat source.
Radiation is the distant mode of heat transfer in the form of electromagnetic waves.
Answer: 150 joules
Explanation:
Force applied on a block = 25N
Distance moved by block = 6 m
Workdone = ?
Recall that work is done when force is applied on an object over a distance. And it is measured in joules.
I.e Workdone = Force X Distance
= 25N x 6 metres
= 150 joules
Thus, 150 joules of work is done by the applied force.
