During moderate activity, the body of a person weighing 70 kg creates 1.0 MJ energy per hour. About 80% of that energy is converted into heat. For how much would the body be heaten up during this time if it were completely isolated from the environment?

Q: The heating element in an electric kettle is rated as 2.0 kW. If the water in the kettle is at 100.0…

A: The expression for the power,

Q: Two blocks of copper, one of mass 1 kg and the second of mass 3 kg, are at the same temperature.…

A: Using the thermal energy equation, The thermal energy is proportional to the mass Here, both the…

Q: The specific heat of aluminum is 0.21 J/g°C. How much heat energy is released when a 10 g piece of…

A: Given:-  The specific heat of aluminum is 0.21 J/g°C The mass of aluminum foil is m = 10 g   The…

Q: What is the change in the rate of the radiated heat by a body at the temperature T1 = 20ºC compared…

A:

Q: A concerned mother is dressing her child for play in the snow. The child's skin temperature is…

A: Given: The emissivity of the child's skin ε= 0.700 Exposed area A=1.25 ✕ 10-2 m2 Skin temperature…

Q: At room temperature, a typical person loses energy to the surroundings at the rate of 62 W. If this…

A: Given data :                 Rate of energy lost  = 62 W

Q: How much heat is required to melt 30kg of ice at 0 °C to water at 10 °C? The latent heat of ice to…

A: Here, the ice is at the melting point. First ice will completely converted into water at the melting…

Q: A 59.7 gram piece of metal is placed in 60.0mL of water and heated from 22.0-28.5°C. What is the…

A: Question asks about the specific heat, but the options given are of heat.    Mass, m = 59.7…

Q: On a hot day, the temperature of an 80,000-L swimming pool increases by 1.50 °C . What is the net…

A: The expression for the net heat transfer is,

Q: If a river having a flow rate of 942 cubic feet per second flows over a waterfall having a height of…

A: Given The flow rate of the river is Q = 942 ft3/s. The height of the waterfalls is h = 14 m. The…

Q: A hollow box with an opening of 1 cm2 area is heated electrically. How much is energy is emitted per…

A: Given value--- Area = 1 cm2. Temperature = 1600 K. We have to find--- power emitted per second?…

Q: Water has a latent heat of fusion of 334 J/g and a latent heat of vaporization of 2260 J/g. How much…

A: Mass of the water is given. Now at boiling point the temperature of water has already increased from…

Q: A room has a pine ceiling (k = 0.12 WI(m-Cº) ] that measures 3.0 m x 4.0 m 2.0 cm. On a cold day,…

A: We need to calculate how much energy will be saved if we use wool as an insulator.

Q: 2m2 of water is converted into 2050 m3 of steam at atmospheric pressure and 100°C temperature. If…

A: From thermodynamics’ first law, the internal energy in the process can be expressed as,

Q: The heat of fusion of ice/water is 3.35x105 J/kg. How much energy is required to melt 50 grams (0.05…

A:

Q: A 0.250-kg aluminum bowl holding 0.800 kg of soup at 25.0ºC is placed in a freezer. What is the…

A: Given: mass of aluminium,m= 0.250 kg  mass of soup,m' = 0.8 kg  initial temperature, T = 25 degree C…

Q: A 0.250-kg aluminum bowl holding 0.800 kg of soup at 25.0 °C is placed in a freezer. What is the…

A: The amount of heat lost to cool the soup from 25°C to 0°C is…

Q: A 10-kg iron ball is dropped onto a pavement from a height of 100 m. If half of the heat generated…

A:

Q: A 2.0-kg aluminum block is originally at 10 degree Celcius. If 36 k) of energy are added to the…

A: Given that, Mass of the aluminum block, m = 2 kg The initial temperature of the block,…

Q: What will be the final temperature if 4.0x10^4 J of heat is transferred to a 1.5kg block of aluminum…

A: Given: Specific heat of aluminum = 9×102 J/kg.C° Initial temperature Ti = 15 °C Heat transferred =…

Q: How much heat is required to raise the temperature of 1.10 lb of water from 20C to 30C? Given that…

A: Given : Mass (m) = 1.10 lb = 498.952 g T1 = 20°C T2 = 30°C c = 1 cal/g°C

Q: On a hot day, the temperature of an 80,000-L swimming pool increases by 1.50ºC . What is the net…

A: Given:  Volume of water, V = 80,000 L = 80,000 x 10-3 m3 density of water, d = 1000 kg/m3 rise in…

Q: The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 x 105 J/kg, and its…

A: According to question --- Given data--- melting point = 660 degree C  Latent heat of fusion = 4 ×…

Q: A 4.90-kg steel ball at 26.6°C is dropped from a height of 21.8 m into an insulated container with…

A: Given : Mass of steel (ms) = 4.90 kg Temperature of steel (Ts) = 26.6°C  Height (h) = 21.8 m Volume…

Q: 20) At room temperature, a typical person loses energy to the surroundings at the rate of 62 W. If…

A:

Q: of copper whose mass is 15 kg has a specific heat capacity 390 J/kgx and is warmed by Coco Martin so…

A: Mass of copper, m=15 kg Specific heat capacity, C=390 J/kg OC CChange in temperature = 5 o C

Q: On a hot dry day, evaporation from a lake has just enough heat transfer to balance the 1.00 kW/m2 of…

A: Given: The heat transfer from the sun is Q=1 kW/m2. The time of evaporation is t=1 h. The area of…

Q: You have 54 g of steam at 100°C. How much heat must be removed to change it to 54 g of water at…

A: Given data:  Mass (m) = 54 g = 0.054 kg Initial temperature (T0) = 100 °C Final temperature (T) = 20…

Q: How much heat must be added to 100 g of ice at 0 ° C to melt the ice completely?

A:

Q: How much thermal energy is absorbed by a 0.0220 kg ice cube as it melts? The latent heat of fusion…

A: Assume initially the ice is at 0°CMice=0.022 kgLatent heat LH=3.4x105 J/kg

Q: A person is standing outdoors in the shade where the temperature is 33 °C. What is the radiant…

A: Solution       Given T = 33°                  e = 0.85

Q: A 2 kg block of metal with a specific heat of 100 J/kgºC is dropped from rest at a height of 100 m…

A: let g ≃ 9.8 m/s2mass of block m = 2 k.g.specific heat c = 100 J/kg °cHeight H = 100 mHalf of initial…

Q: A 600-g piece of tin absorbs 1000 J of heat. By how much will its temperature change? (ctin = 227…

A:

Q: After eating a 200 g bottle of yogurt, Bob decides to go for a run to burn off the extra energy. The…

A: Given: Mass of the yogurt eaten by bob = 200 g Energy from the yogurt = 5.4 MJ/kg Metabolic rate of…

Q: How much heat is required to raise the temperature of a 225 g lead ball from 15 °C to 25 °C? The…

A: Option C is the right answer  288 J

Q: window glass 0.50-cm thick has dimensions of 3.0 m by 1.5 m. If the outside temperature is -10°C and…

A:

Q: Consider a frozen lake. If the air temperature above the surface is -16.3 °C, what is the heat flow…

A: Given data, Temperature T=-16.3 °C The conductivity of K=2.20 W/(m-K) distance d=43.1 cm

Q: What is the final temperature when 625 grams of water at 75˚C loses 79,600 J of heat?

A: From the question it is given that, Weight of the water is 625 grams, and it loses 79,600 J of…

Q: What is the amount of heat energy absorbed by a copper of mass 300g if its temperature raises by…

A: Given : m = 300 g = 0.3 kg ∆T = 12°C c = 390 J/kg°C

Q: While running, you need to transfer 300 J/s of thermal energy from your body to the moisture on your…

A:

Q: A 0.250-kg aluminum bowl holding 0.800 kg of soup at 25.0 C is placed in a freezer. What is the…

A: mbowl = 0.25 kgmsoup = 0.8 kgTi = 25°C = 298 KQrel = 377 × 103 JcAl = 900 J/kg °C =cbowl cwater =…

Q: In Rusayl cable factory, 150 kg of raw copper is molten to make wires and cables. If 20.1 MJ of heat…

A: Given: The mass of raw copper is m=150 kg. The heat required is Q=20.1 MJ.   The expression of…

Q: A bullet of mass 10 g moving with speed of 9ung y 210 m/s in stopped suddenly. If all its kinetic…

A:

Q: If her body retains 10 J of thermal energy for each joule of work done while lifting, how many times…

A: Data Given , Mass of the women ( mw ) = 47 kg Mass of the barbell ( mb ) = 20 kg Height ( h ) = 0.80…