A 55.0-kg woman eats a 540 Calorie (540 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman–Earth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15.0 cm. (c) If the human body is only 25.0% efficient in converting chemical potential energy to mechanical energy, how many stepsmust the woman climb to work off her breakfast?

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: Calculate the rate of steady heat transfer from a 8 m-by-10 m roof of a building during a cold…

A:

Q: The human body, while at rest, produces heat energy at a rate of about 117 W. How much sweat (in g)…

A: The heat energy evaporated  per minute is,   Q=Qt˙=117 W1 minute60 s1 minute=7020 J

Q: An aluminum washer has an outer radius ro=1.3cm and an inner radius of ri=0.43cm. The temperature of…

A: Given ,         initial temperature Ti=282k         Final temperature Tf=630k        mass of…

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: A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of…

A:

Q: A steam engine operation between 150 C and 550 C. What is the theoretical maximum thermal…

A: Given value--- low temperature = 150 degree C.  higher temperature = 550 degree C.  We have to…

Q: An ice cube of mass 1.000kg and temperature −5.00 C is placed in a calorimeter. Then 0.200kg of…

A: Mass of ice (m) = 1 kg Mass of steam (m') = 0.2 kg Initial temperature of ice = - 5 degree C Initial…

Q: A well-sealed room contains 60 kg of air at 200 kPa and 25°C. Now solar energy enters the room at an…

A:

Q: certain heat energy is needed to freeze a can of juice (360g) from -5 oC (temperature of an…

A: In this situation we have to change the phase of juice 2 time once when we convert solid to liquid…

Q: 9. Based on the specific heat table given, which of the following substances is the best thermal…

A: 10 ) specific heat is the heay required to raise the temperature of the object of unit mass by 1°C…

Q: Following vigorous exercise, the body temperature of a 70.0 kg person is 39.3°C . At what rate in…

A:

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

A:

Q: The maximum amount of water an adult in temperate climates can perspire in one hour is typically 1.8…

A:

Q: A 100 kg steel support rod in a building has a length of 2.0 m at a temperature of 200C. The rod…

A:

Q: Overall, 80% of the energy used by the body must be eliminated as excess thermal energy and needs to…

A: Since there are multiple sub parts posted, we will answer the first three sub parts. a) The equation…

Q: A 0.2-kg aluminum plate, initially at 20°C, slides down a 15-m-long surface, inclined at a 30 degree…

A: Given Information: The mass of the aluminum (m) = 0.2 kg The initial temperature of the aluminium…

Q: A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of…

A: Given Data: The stove is cylindrical in shape with diameter d = 40 cm. Length of the  stove is l =…

Q: The average person produces heat at the rate of about 120 W when at rest. At what rate must water…

A: Given: For water Latent Heat of Vaporization (Lv) = 2430 kJ/kg or 2430 J/g Heat produce rate (H) =…

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: The human body, while at rest, produces heat energy at a rate of about 116 W. How much sweat (in g)…

A: Given data The heat energy is given as Q˙=116 W. The latent heat of vaporisation is given as Lv =…

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: gresa method

A: Given:- A room has a pine ceiling [ k1 = 0.12 W/(m•C°) ] that measures 3.0 m x 4.0 m x 2.0 cm the…

Q: 1. Heat energy travels from an object with a high __________. * a. internal energy to an object…

A: for heat transfer to take place is a difference in temperature between two objects. Without this…

Q: What is the magnitude of energy (in MJ) that must be removed to freeze 439 L of water with a density…

A:

Q: A 75-kg cross-country skier glides over snow as in Figure P11.33. The coefficient of friction…

A: Formula to calculate the work done against the friction is,

Q: A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of…

A: Given that: The diameter is 40 cm and length is 55 cm of the cylinder. The cylinder at 410°F. Room…

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

A: Given data The rate of energy is given as E = 10.3 W. The surface area is given as A = 1.63 m2. The…

Q: A building science major is investigating energy loss through windows. The windowpane of interest is…

A: (a) Rate of heat transfer H=kA∆Td=0.8 Wm·°C0.88 m ×2.30 m28.0°C0.950×10-2 m=4772 W

Q: Newton's Law of Cooling says that the rate at which a body cools is proportional to the difference…

A: The equation F(t) =T +Cekt will help us to solve the problem F(t) = temperature of the body. T =…

Q: The basic principle of calorimetry states that: In an isolated system whose parts interact by heat…

A: This question is based on Thermodynamics topic. The principle of calorimetry is based on…

Q: A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of…

A: Given data The diameter of the stove is: d = 40 cm 0.4 m The length of the stove is: l = 49 cm =…

Q: One face of an aluminium cube of edge 2 meters is maintained at 100ºC and the other end is…

A: Given : Thermal Conductivity (K) = 209 W/m ºC Area of cube = (2 x 2) m2 = 4 m2 Time(t) = 5 seconds…

Q: Overall, 80% of the energy used by the body must be eliminated as excess thermal energy and needs to…

A: (a)P = σ A e (T4 - T4)

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: 15.3.1. An insulated container is filled with a mixture of water and ice at zero °C. An electric…

A:

Q: Consider a surface at -5ºC in an environment at 25ºC. The maximum rate of heat that can be emitted…

A:

Q: A concerned mother is dressing her child for play in the snow. The child’s skin temperature is 34.0…

A:

Q: At what net rate (in kW) does heat radiate from a 250 m black roof on a night when the roof's…

A:

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

A:

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.