You are asked to test a machine that the inventor calls an“in-room air conditioner”: a big box, standing in the middleof the room, with a cable that plugs into a power outlet.When the machine is switched on, you feel a stream of coldair coming out of it. How do you know that this machinecannot cool the room?

Q: What is the magnitude of energy (in MJ) that must be removed to freeze 344 L of water with a density…

A: Given  Volume of water V= 344L V=0.334m3 ρ=999.8kg/m3 Mass m=343.931 kg Latent heat of freezing Lf =…

Q: A basketball player does 4.81 * 105J of work during her timein the game, and evaporates 0.151 kg of…

A: With the help of  the First Law of Thermodynamics, we have, ∆U=q+w where ∆U= change in internal…

Q: If a system has 325 kcal of work done to it, and releases 5.00 × 102 kJ of heat into its…

A: Given:  Work done, W = 325 kcal = 325 x 4.18 kJ = 1358.5 kJ As there are 4.18 J in one cal.  heat…

Q: You can save money on electricity if you put your refrigerator in the basement, which is usually…

A: temperature variation with height:

Q: Water oozes out from a porous pot , the pressure inside being 20 atmospheres more than that outside.…

A: If 1gm of water oozes out 1 cm2 area of surface, m g will occupy m cc. Length of water coming out=m…

Q: In a production facility, 1.2-in-thick, 2-ft *2-ft square brass plates (r = 532.5 lbm/ft3 and cp…

A:

Q: Suppose you are hiking down the Grand Canyon. At the top, the temperature early in the morning is a…

A:

Q: Suppose that your oven is calibrated in degrees Fahrenheit but a recipe calls for you to bake at 175…

A: Given: The temperature in degree celsius is 175 °C.

Q: dermatologist often remove small precancerours skin lesions by freezing them quickly with liquid…

A: It is given that,

Q: Is it possible to maintain a pressure of 10 kPa in a condenser that is being cooled by river water…

A: The pressure at saturation temperature is,

Q: What does zeroth law of thermodynamics tell us about measuring the temperature of an object?

A: Zeroth law of thermodynamic states that , " If two systems A and B, are separately in thermal…

Q: It is important for the body to be able to cool itself even during moderate exercise. Suppose a 70kg…

A: Given : m = 70 kg t = 30 min = 30 x 60 = 1800 s P = 1000 W

Q: What is the change in the internal energy of a system when a total of 150.00 J is transferred by…

A:

Q: If a gas system of one to two volumes expands under constant pressure at the same time, then 100J of…

A: Given, Heat lost to ocean, Q=-100 J Volume expansion, V to 2V

Q: Students on a spring break picnic bring a cooler that contains5.1 kg of ice at 0.0 °C. The cooler…

A: (b)The rate of heat transfer is given by, Q˙=kAT2-T1d Here, k is the thermal conductivity of the…

Q: If you place 0ºC ice into 0ºC water in an insulated container, what will happen? Will some ice melt,…

A: As 0ºC ice and 0ºC water are at same temperature, they are in thermal equilibrium.

Q: An aluminum mast whose cross-section area is 7.20 in? is 60 long at 60 °F. (a) By how much does it…

A:

Q: How much energy is transferred thermally to change 0.2 L of ice at -20◦C into steam?   (density of…

A:

Q: What is the change in internal energy of a system which does 4.50×105J of work while 3.00×106 J of…

A: The change in internal energy(ΔU) of a system.given,workdone(W)=4.50×105 J Heat goes…

Q: A system gains 3310 J of heat at a constant pressure of 1.38 × 105 Pa, and its internal energy…

A: Write the given values with suitable variables.

Q: The robot HooRU is lost in space, floating around aimlessly, and radiates heat into the depths of…

A:

Q: An aluminum rod is 18.7 cm long at 20°C and has a mass of 350 g. If 11,000 J of energy is added to…

A:

Q: After watching a food hack video on Facebook, you decide to make some ‘coffee ice cubes’ by freezing…

A: Given information:

Q: Does an ordinary electric fan cool the air? Why or why not?If not, why use it?

A: Electric fan

Q: (I) (a) 18° below zero on the Celsius scale is what Fahrenheittemperature? (b) 18° below zero on the…

A:

Q: Is heat discharged at the back of refrigerator and by a heat pump given off by vaporization of the…

A: Both processes which are mentioned in the question are used to discharge the heat from the back of…

Q: Lake Erie contains roughly 4.50E+11 m3 of water. How much heat is required to raise the temperature…

A: Given , volume of water = 4.50E+11 m3  density of water = 1000 kg/m3 Difference in temperature of…

Q: The pressure on 0.2 kg of water is increased reversibly and isothermally from atmo- spheric pressure…

A: Temperature =20⁰c=293 k Mass of the water =0.2 kg No of moles = 0.2/18 =0.011

Q: One winter day, the climate control system of a large university classroom building malfunctions. As…

A: Given: The volume of cold air is 500 m3. Time duration is 1 min. The temperature change is 10…

Q: A furnace is shaped like a long equilateral-triangularduct where the width of each side is 2 m. Heat…

A:

Q: If at instant t = 0 the temperature difference is ∆T0, show that at a later instant t the…

A:

Q: Answer the following by filling the blank: During a bout with the flu, an 80-kg person ran a fever…

A: Mass of body , M=80 kg Specific heat , S = 3470 J/kg K Final temperature , Tf = 39 oC We know…

Q: How much heat is needed to completely vaporize 20 grams of ice, initially at 5oF? (Note that initial…

A: Covert 5 Fahrenheit into degree Celsius.

Q: A Dallas home has their thermostat set at 70 °F. During a hot summer day, the power suddenly cut off…

A: Given, The temperature of the surrounding Ts= 80°F dTdt=2°F/hr k=0.5 per hour

Q: A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0-cm-thick sealed…

A: Thickness of each glass plane, Lg= 0.50cm Thickness of air sealed layer, La = 1.0cm Inside…

Q: in a workout session, Ali used a threadmill when he worked at an average rate of 450 joules per…

A: Given, Rate of work done by Ali = 450 J/s Rate of heat flow = 795 J/s Heat is flowed out of the body…

Q: If you place 0 °C ice into 0 °C water in an insulated container, what will the net result be? Will…

A: The insulated container containing Ice and water at same temperature. To change phase of ice to…

Q: A thirsty nurse cools a 2.00 L bottle of a soft drink (mostlywater) by pouring it into a large…

A: Given:- A thirsty nurse cools a 2.00 L of water =2.0 kg  The mass of the aluminum mug is 0.257 kg…

Q: If the person in the example is a Terminator machine that is composed of 99.99% Aluminum. How much…

A: Heat required, Q=mc∆T specific heat of aluminium 0.89J /gm-C=0.89 X1000 J/kg-C   Assume rest of the…

Q: The transfer of energy from one region of the atmosphere to another is of great importance in…

A: number of moles (n) = 1 Temperature (T) = 300 K Initial volume (V1) = 22 dm3Final volume (V2) = 30…