find the minimum amount of work necessary to extract a heat calory from a body at a temperature of -15 ° C when the ambient temperature is 40 ° C
find the minimum amount of work necessary to extract a heat calory from a body at...
37. A refrigerator uses 40 J of work to extract heat from a heat reservoir at 0.00°C. If the coefficient of performance of the refrigerator is 2.1, then how much heat is extracted from the heat reservoir at 0.00°C? 90 J 84 J 48 J 65 J
SKMM 3433 A solid body which is initially at a uniform temperature Tİ is exposed to an ambient air at temperature Te. Explain how you would determine the maximum amount of heat that can be transferred to the body. What does this amount of heat represent? Q2. (a) (5 marks) A wall ofa room is made of lightweight concrete material (ρ= 1600 kg/m.に0.79 W/m K and cp 0.84 kJ/kg K) with a thickness of 150 mm. Initially the wall is...
Calculate the amount of heat necessary to raise the temperature of 135.0g of water from 50.4 degrees F to 85 degrees F. The specific heat of water is=4.184J/g.degrees C.
We propose to heat a house in the winter with a heat pump. The house is to be maintained at 20°C at all times. When the ambient temperature outside drops to -10°C, the rate at which heat is lost from the house is estimated to be 25 kW. What is the minimum electrical power (in kW) required to drive the heat pump? Use the correct sign convention to indicate the direction of work. Hint: the minimum power happens with the...
Calculate the amount of heat (in kJ) necessary to raise the temperature of 51.8 g benzene by 52.6 K. The specific heat capacity of benzene is 1.72 J/g⋅∘C.
The characteristic photoelectric threshold of a certain metal is 2750 A. Find: (a) The work necessary to extract an electron from the metal; (b) The maximum speed of the photoelectrons released by light of wavelength of 1800 A; (c) The maximum kinetic energy of the photoelectrons.
The specific heat c is the amount of heat necessary to change the temperature of 1.00 kg of mass by 1.00°C. The specific heat c is a property of the substance; its Sl unit is J/(kg · K) or J/(kg.°C). Recall that the temperature change (AT) is the same in units of kelvin and degrees Celsius. water silver copper cup Case 1: A 0.780-kg silver pellet with a temperature of 85 °C is added to 0.150 kg of water in...
If the heat necessary to warm 530.0 g of water from a temperature of T1 = 20.0 °C to T2 = 87.0 °C were somehow converted to translational kinetic energy of this amount of water, what would be the speed of this water?
If the heat necessary to warm 620.0 g of water from a temperature of T1 = 13.0 °C to T2 = 80.0 °C were somehow converted to translational kinetic energy of this amount of water, what would be the speed of this water?
12. Consider a proposal to extract heat directly from the Earth's core by drilling a cylindrical shaft of radius 1 m and depth 100 km through the earth's mantle and filling it with copper Estimate the power output assuming the temperature difference is 1,000 °C and the thermal conductivity is 3.5 x 102 W/m °c