Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 10 rubs, at a distance of 7.50 cm per rub, and with a frictional force of 50.0 N, what is the temperature increase in degrees Celsius? The mass of tissue warmed is only 0.100 kg, mostly in the palms and fingers.

Q: A runner generates 1260 W of thermal energy. If this heat has to be removed only by evaporation, how…

A: It is given that,

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: Following vigorous exercise, the body temperature of an 80.0-kg person is 40.0ºC . At what rate in…

A: The amount of heat transfer is given as, Here, m, c and ΔT represent the person’s mass, the…

Q: 7. Consider a material with a mass of 1.3 kg and a specific heat capacity of 1.7 J/kg°C. Compute for…

A:

Q: I have 500g of water at 25oC. If the amount of heat required to raise the temperature of this water…

A: Given data:Mass of the water, m = 500 g = 0.5 kgThe specific heat of water, C = 4.186 joule/gram…

Q: 1. 500J of work are done on a system in a process that decreases the system’s thermal energy by…

A: According to the first law of thermodynamics, ∆U=Q+WQ=∆U-W Here, ∆U is the change in the internal…

Q: Heat is added to a 9.0 kg piece of ice at a rate of 529.0 kW. How long will it take for the ice at…

A: Given information:Mass of the ice (m) = 9.0 kgHeat transfer rate (Q/T) = 529.0 kWLatent heat of…

Q: How many slices of pizza must you eat to walk for 1.0 h at a speed of 5.0 km/h? (Assume your mass is…

A: The average metabolic power for a 68 Kg individual to walk at the given speed is 380 W and the…

Q: While painting the top of an antenna 225 m in height, a worker accidentally lets a 1.00 L water…

A: Given:-              While painting the top of an antenna 225 m in height, a worker accidentally…

Q: Which sample of water has the most thermal energy? O A. A 0.5 kg sample at 1°C O B. A 1.5 kg sample…

A: Heat depends on the mass, specific heat and temperature.

Q: A block of 10.0 kg of solid gold at its melting point of 1,063.00°C changes phase to liquid gold at…

A: Given data: The mass of block is m=10 kg. The melting temperature is T=1063℃. The latent heat of…

Q: - The increase in internal energy of 1kg of water at 100°C when it is converted into steam at the…

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: What would be the temperature of 40.0 g of 22°C water mixed with 60.0 g of 80°C water? Answer in…

A: According to the conservation of energy, Heat gain by the cold water = Heat loose by the hot water…

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

A:

Q: Following vigorous exercise, the body temperature of a 75.0 kg person is 38.7°C. At what rate in…

A: Write the formula for the specific heat in terms of the energy transferred out. Write the formula…

Q: A 0.200-kg aluminum cup contains 800. g of water in thermal equilibrium with the cup at 80.°C. The…

A: Given,

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: If ten grams of ice at 0 degree celcius is converted to water with temperature of 20 C degree, what…

A: To find the amount of heat required to raise the temperature of a mass m, we use the formula Q =…

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

A: Given:Mass(m)=2 kg , specific heat (cp)=900 J/kg.KAdded heat = 36000 JInitial temperature,Ti=10°=283…

Q: 100J of heat energy are transferred to 70 g of mercury. By how much does the temperature increase?…

A: given Mass m =70 g = 0.07 kg Heat given Q =100 J

Q: Ice at U.00°C is added to 1.00 kg of orange juice, cooling it from 20.0°C to 5.00°C. What mass of…

A:

Q: The human body, while at rest, produces heat energy at a rate of about 100 W. How much sweat (in g)…

A:

Q: The same energy Q enters five different substances as heat. Which of these has the greatest specific…

A:

Q: How much heat energy is required to raise 3.97 g of aluminum by 17.0 K? A. 0.23 J B. 73 J C. 62 J…

A: Given data :- mass of aluminum m = 3.97 g change in temperature ∆T = 17 K  = 17 °C

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: Thermal energy is added to 150 g of water at the rate of 55 J>s for2.5 min. How much does the…

A: Here, Q=55J/s×2.5×60s=8250J

Q: A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 564 g of ice melts…

A: Given data:  Mass of ice (m) = 564 g = 0.564 kg Time (t) = 1 hour = 3600 seconds The heat of fusion…

Q: The temperature of an aluminum disk is increased by 250 ∘C. By what percentage does its volume…

A: Consider the amount of the temperature increased of the aluminum disk be ∆T, the initial volume of…

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: A student tries to decide what to wear. His room is at 20˚C. Its skin temperature is 35˚C. The area…

A:

Q: A steam boiler is made of steel and weighs 900 kg. The boiler contains 400 kg of water. Assuming…

A: Given Mass of steel ms = 900 kg Mass of water mw = 400 kg heat capacity of steel cs = 0.11 kcal/kg K…

Q: During a process, the internal energy of a system increases by 16 Kj, at the same time it performs a…

A: According to the first law of thermodynamics,  dQ = dU + dW  where, dQ is the heat supplied, dU is…

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: The human body, while at rest, produces heat energy at a rate of about 103 W. How much sweat (in g)…

A: The expression for the amount of sweat is,

Q: A runner generates 1260 W of thermal energy. If this heat has to be removed only by evaporation, how…

A: Given, time=15min=15x60=900s Thermal Energy = 1260W= 1260 J/s So, total energy produced in 15 min=…

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: The specific heat of a substance varies with temperature according to the function c = 0.20 + 0.14T…

A:

Q: A 2.0-kg aluminum block is originally at 10 degrees celcius. If 36 kJ of energy are added to the…

A: The heat energy used to raise the temperature of aluminum is calculated by using the formula…

Q: How much heat is absorbed by a persons hand if 100 grams of liquid water at 100°C is poured on his…

A:

Q: In a certain solar house, energy from the Sun is stored in barrels filled with water. In a…

A:

Q: Following vigorous exercise, the body temperature of an 80.0 kg person is 40.0 °C . At what rate in…

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…

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.