If you hold a rubber band loosely between two fingers and then stretch it, you can tell by touching it to the sensitive skin of your forehead that stretching the rubber band has increased its temperature. If you then let the rubber band rest against your forehead, it soon returns to its original temperature. What are the signs of W and Q for the entire process?

Q: The highest recorded waterfall in the world is found at Angel Falls in Venezuela. Its longest single…

A: Given:- Height(h)= 807m Initial temperature(Ti)=15.9°C specific heat of water(C)=4186 J/kg°C

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: 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: A piece of iron block moves across a rough horizontal surface before coming to rest. The mass of the…

A: The mass of the block, m = 2.8 kg The initial velocity of the block, v = 2.0 m/s The specific heat…

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: When you use a hand pump to inflate the tires of your bicycle, the pump gets warm after a while.…

A: Solution:- Before proceeding to the answer let's see about the adiabatic process, as it plays 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: During a bout with the flu an 80 kg man ran a fever of 102.2 °F instead of the normal body…

A: Given: The mass (m) of the man is 80 kg. The temperature (Tf) of the man is 102.2 degrees F. The…

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: Should a modern kitchen be air-conditioned? Will this  create cold food(which is supposed to be…

A: Yes, a modern kitchen can be air-condtioned. If the kitchen is an open one then installing an air…

Q: Answer all parts.

A: 11. (c) Yes but you can only determine whether the person's body temperature is higher or lower than…

Q: Consider an object with any one of the shapes displayed in Table 8.1. What is the percentage…

A: The percentage increase in moment of inertia can be given by The moment of inertia is proportional…

Q: How much heat is needed to raise the temperature of 2 kg of water 5K? a. 41800J b. 42800J c. 43800J…

A:

Q: 850.0 g iron that is initially at 500°C is dropped into a bucket containing 22.0 kg of water at…

A:

Q: Which of the following statements is FALSE regarding a substance undergoing a phase change? O The…

A: Given, statements about a substance undergoing phase change

Q: A poker is a stiff, nonflammable rod used to push burning logs around in a fireplace. Suppose it is…

A:

Q: a mental patient keeps pushing against the wall for a long time. does this generate heat? 1. only…

A: ANS.  1 and 3

Q: The highest waterfall in the world is the Salto Angel in Venezuela. Its longest single falls has a…

A: Given: Height of longest single fall =807 m Temperature at the top = 14.8 oC Let the mass of water…

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: (k-0.84 J/sm'C) in one minute if the temperature difference between two sides of the window is 10.…

A:

Q: An arrow in a bow in a bow has 270 (J) of potential energy. Assuming 100 (J) of energy were…

A:

Q: Suppose you stand with one foot on ceramic flooring and one on a wool carpet, making contact over an…

A:

Q: On a windy day, a camper feels colder as compared to a day at the same temperature when there is no…

A: We need to comment on the major mechanism of heat transfer in the situation described in the…

Q: Suppose10.9 kgof12°Cwater is mixed with16.9 kgof77°C water. If no heat is lost in this system,…

A:

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: #1: 50 grams of ice at 0 C and 50 grams of water at 0 C have the same internal energy #2:  50 grams…

A: 50 gm of ice at 0 ̊C will have less internal energy then 50 gm of water at 0 ̊C. because 50 gm of…

Q: 6 kg of ice at -10.0 °C is added to 30 kg of water at 20 oC. (a) How much heat is needed to melt the…

A:

Q: A student likes to have a cup coffee while doing an online assignment. Using a porcelain cup 300 g…

A: The principle of calorimetry states that the total heat gained by components of a system is equal to…

Q: Which temperature has the most kinetic energy? -10°C 200 K 100 K 0°F

A: we have the relation between kinetic energy and temperature, i.e, Kinetic energy, K = ( 3RT) / 2NA…

Q: Your neighbor has circular steel lid for his well. The lid has an outer diameter of 0.909 m. The…

A: The expansion in area with temperature is given by ∆A=Aiα∆TWhere α is linear expansion, ∆T is change…

Q: Which temperature has the most kinetic energy? A. 100 K B. -10°C C. 200 K D. 0°F

A:

Q: A 100 W lightbulb generates 95 W of heat, which is dissipated through a glass bulb that has a radius…

A: GivenThe 100W bulb is generated heat in one second } H = 95W.Radius (r) = 3 cm                = 0.03…

Q: 10. A 1.00 g of ice at -30.0°C is heated and converts to steam at 120.0°C. The figure below shows…

A:

Q: steel block of mass m is given a push so that it initially slides along a horizontal, steel track of…

A:

Q: 17.50 . An open container holds 0.550 kg of ice at –15.0°C. The mass of the container can be…

A:

Q: A copper wheel rubs against a copper plate in such a manner that there is a 47.0 N force of kinetic…

A: (a) given that forceof Kinetic friction;Fk=47 Nrelative spped netween the surfaces; V=41 m/srate at…

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 block has a temperature of 277 K. Heat could spontaneously flow from which of the following…

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: What is the minimum velocity of a lead bullet if it completely melts when it strikes a wall? The…

A:

Q: SKIN temperatures (57 C)the iatent neat or vap moi water ny of watch p=998.2 kg/m'. 3. Assume that…

A: (3) The rate of conduction of heat transfer per hour through a material is,

Q: 5 kg of fish (Cp =3600 J/KgK) is placed in a storage box that has A=0,45 m2 and k=0,025 W/mK.  The…

A:

Q: What happens to objects when temperature increases? For instance, a jar cover can be removed by…

A: When temperature of objects is increased, then expansion of objects takes place.  This happens…

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.