# Ch 10, 13, 14, 15

 The flashcards below were created by user megame623 on FreezingBlue Flashcards. The amount of heat necessary to raise the temperature of 1 gram of water by 1 degree C is reffered to as the A) British thermal unit B) calorie C) kilojoule D) kilocalorie B) calorie(this multiple choice question has been scrambled) A cup of water is scooped up from a swimming pool of water. Compare the temperature T and the internal energy of U of the water, in both the cup and the swimming pool. A) Tpool is equal to Tcup, and Upool is less than Ucup. B) Tpool is equal to Tcup, and Upool is greater than Ucup. C) Tpool is greater than Tcup, and the U is the same. D) Tpool is less than Tcup, and the U is the same. B) Tpool is equal to Tcup, and Upool is greater than Ucup.(this multiple choice question has been scrambled) It is a well-known fact that water has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true? A) They are no longer in thermal equilibrium; the iron is warmer. B) They remain in thermal equilibrium. C) It is impossible to say without knowing the exact mass involved and the exact specific heat capacities. D) They are no longer in thermal equilibrium; the water is warmer. A) They are no longer in thermal equilibrium; the iron is warmer.(this multiple choice question has been scrambled) In a cloud formation, water vapor condenses into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to A) freeze B) stay constant C) increase D) decrease C) increase(this multiple choice question has been scrambled) The process whereby heat flows by means of molecular collisions is referred to as A) convection B) radiation C) inversion D) conduction D) conduction(this multiple choice question has been scrambled) On a cold day, a piece of metal feels much colder to the touch than a piece of wood. This is due to the difference in which one of the following physical property? A) thermal conductivity B) specific heat C) latent heat D) density A) thermal conductivity(this multiple choice question has been scrambled) Phase changes occur A) as the temperature remains the same B) as the temperature decreases C) as the temperature increases D) all of the above A) as the temperature remains the same(this multiple choice question has been scrambled) If heat is added to a pure substance at a steady rate, A) it will eventually boil B) it will eventually melt C) its temperature will begin to rise D) More than one of the above is true. E) None of the above is true. D) More than one of the above is true.Also, ask questions whenever you're not sure. Convection can occur A) only in liquids and gases B) only in solids C) only in liquids D) in solids, liquids, and gases E) only in gases A) only in liquids and gases(this multiple choice question has been scrambled) 16.5 kcal of heat is equivalent to how much work? A) 3940J B) 3.94J C) 69.1J D) 69100J D) 69100J16.5 kcal = 16500 cal; W = KE, KE = J, 16500x4.18 = 68970 which I guess is close to 69100? When the first law of thermodynamics, Q = U + W, is applied to an ideal gas that is taken through an isothermal process, A) W = 0 B) U = 0 C) Q = 0 D) none of the above B) U = 0(this multiple choice question has been scrambled) Is it possible to transfer heat from a cold reservoir to a hot reservoir? A) No. B) Yes; this will happen naturally. C) Theoretically yes, but it hasn't been accomplished yet. D) Yes, but work will have to be done. D) Yes, but work will have to be done.(this multiple choice question has been scrambled) The efficiency of a heat engine is defined as the ratio of A) the heat input at the high temperature to the heat output at the low temperature B) the heat output at the low temperature to the heat input at the high temperature C) the work it does to the heat output at the low temperature D) the work it does to the heat input at the high temperature D) the work it does to the heat input at the high temperature(eff = W/Qh) During an isothermal process, 5.0J of heat is removed from an ideal gas. What is the change in internal energy? A) 2.5J B) zero C) 5.0J D) 10J B) zero(isothermal, U = 0, Q = -W, etc) A gas is taken through the cycle illustrated (rectangle, P-2P x V-4V). During one cycle, how much work is done by an engine operating on this cycle? A) 4PV B) PV C) 3PV D) 2PV C) 3PV(W is area inside box, so 1Px3V=3PV) 200J of work is done in compressing a gas adiabatically. What is the change in internal energy of the gas? A) 100J B) zero C) 200J D) There is not enough information to determine. C) 200J(adiabatic, Q = 0, U = W, etc) In an isochoric process, the internal energy of a system decreases by 50J. What is the work done? A) -50J B) zero C) 50J D) none of the above B) zero(isochoric, vertical line, W = 0) A Carnot cycle consists of A) two isotherms and two isomets B) two adiabats and two isotherms C) two isobars and two isotherms D) two adiabats and two isobars B) two adiabats and two isotherms(this multiple choice question has been scrambled) If the theoretical efficiency of a Carnot engine is to be 100%, the heat sink must be A) at 100 degrees C B) infinitely hot C) at absolute zero D) at 0 degrees C C) at absolute zero(this multiple choice question has been scrambled) The second law of thermodynamics leads us to conclude that A) the average temperature of the universe is increasing with the passage of time. B) disorder in the universe is increasing with the passage of time. C) the total energy of the universe is constant. D) it is theoretically possible to convert heat into work with 100% efficiency. B) disorder in the universe is increasing with the passage of time.(this multiple choice question has been scrambled) In an isochoric process going upwards, what are the values of W, Q, and U in terms of pos, neg, or zero? W = 0, Q = +, U = + In an isothermal process going right, what are the values of W, Q, and U in terms of pos, neg, or zero? W = -, Q = +, U = 0 In an isobaric process going left, what are the values of W, Q, and U in terms of pos, neg, or zero? W = +, Q = -, U = - Pressure is A) inversely proportional to force and proportional to area B) proportional to both force and are C) proportional to force and inversely proportional to area D) inversely proportional to both force and area C) proportional to force and inversely proportional to area(this multiple choice question has been scrambled) Consider three drinking glasses. All three have the same area base, and all three are filled to the same depth with water. Glass A is cylindrical. Glass B is wider at the top than the bottom, and so holds more water than A. Glass C is narrower at the top than at the bottom, and so holds less water than A. Which glass has the greatest liquid pressure at the bottom? A) Glass A B) Glass B C) Glass C D) All three have equal pressure. D) All three have equal pressure.(The only factor in pressure is h, all which are the same in this example.) When atmospheric pressure changes, what happens to the absolute pressure at the bottom of a pool? A) It increases by the same amount. B) It increases by a greater amount. C) It increases by a lesser amount. D) It does not change. A) It increases by the same amount.(Atm pressure is only added to gauge pressure for absolute.) An ideal fluid flows at 12m/s in a horizontal pipe. If the pipe widens to twice its original radius, what is the flow speed in the wider section? A) 4.0m/s B) 12m/s C) 2.0m/s D) 6.0m/s D) 6.0m/s(A1V1=A2V2) As a rock sinks deeper and deeper into water of a constant density, what happens to the buoyant force on it? A) It may increase or decrease, depending on the shape of the rock. B) It decreases. C) It increases. D) It remains constant. D) It remains constant.(Fb = pVg, V is constant as long as it is continually completely submerged) A steel ball sinks in water but floats in a pool of mercury. Where is the buoyant force on the ball greater? A) submerged in the water B) floating on the mercury C) the same in both cases D) cannot be determined from the information given B) floating on the mercury(mg is constant, so Fb must be greater in mercury to make it float while it sinks in water) A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub? A) It goes down. B) cannot be determined from the information given C) It goes up. D) It does not change. D) It does not change.(this multiple choice question has been scrambled) Which of the following is associated with the law of conservation of energy in fluids? A) Archimedes' principle B) Bernoulli's principle C) equation of continuity D) Pascal's principle B) Bernoulli's principle(P1 + pgy1 + (1/2)pv1^2 = P2 + pgy2 + (1/2)pv2^2) Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the water pressure greatest? A) point B B) cannot be determined from the information given C) point A D) same at both A and B A) point B(this multiple choice question has been scrambled) What is the gauge pressure at a location 15.0m below the surface of the sea? (The density of seawater is 1.03/10^3 kg/m^3). A) 1.51x10^5 N/m^2 B) 2.52x10^5 N/m^2 C) 1.47x10^5 N/m^2 D) 1.01x10^5 N/m^2 A) 1.51x10^5 N/m^2(P=pgh) What is the tension on a cord pulling a 3.0cm x 4.0cm x 5.0cm of a gold bar (pau = 19x10^3 kg/m^3) from a sunken ship with a constant acceleration of 0.8m/s^2? (psw=1.03x10^3 kg/m^3) p=m/v, convert cm -> m, m=1.14; Fb=pvg, Fb=0.61; EF=ma, so Ft+Fb-Fg=ma, Ft=mg+ma-Fb, Ft=11.48 A bimetallic strip, consisting of metal G on the top and metal H on the bottom, is rigidly attached to a wall at the left. The coefficient of linear thermal expansion for metal G is greater than that of metal H. If the strip is uniformly heated, it will A) bend in the middle B) remain horizontal, but get longer C) curve upward D) curve downward D) curve downward(this multiple choice question has been scrambled) Consider a flat steel plate with a hole through its center. When the plate's temperature is increased, the hole will A) always expand B) expand only if it takes up more than half the plate's surface area C) contract if it takes up less that half the plate's surface area D) always contract A) always expand(this multiple choice question has been scrambled) A steel bride is 100m long at -20C in winter. What is the change in length when the temperature rises to 40C in the summer? (The average coefficient of linear expansion of steel is 11x10^-6) A) 0.66m B) 0.33m C) 0.44m D) 0.55m A) 0.66m(changeinL = (coeff)(orig L)(changeinT)) A container of an ideal gas at 1atm is compressed to one-third its volume, with the temperature held constant. What is its final pressure? A) 3atm B) 9atm C) 1atm D) 1/3atm A) 3atm(P1V1=P2V2) A container holds N molecules of an ideal gas at a given temperature. If the number of molecules in the container is increased to 2N with no change in temperature or volume, the pressure in the container A) doubles B) is cut in half C) remains constant D) none of the above A) doubles(PV=NkT) According to the idea gas law, PV = constant for a given temperature. As a result, an increase in volume corresponds to a decrease in pressure. This happens because the molecules A) strike the container wall less often B) transfer less energy to the walls of the container each time they strike it C) collide with each other more frequently D) move slower on average A) strike the container wall less often(this multiple choice question has been scrambled) The average molecular kinetic energy of a gas can be determined by knowing only A) the temperature of the gas B) the number of molecules in the gas C) the volume of the gas D) the pressure of the gas A) the temperature of the gas.(this multiple choice question has been scrambled) Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen, compared to hydrogen A) is greater B) is less C) cannot be determined since pressure and volume are not given D) is the same D) is the same(this multiple choice question has been scrambled) A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22C. Which gas molecules have the greater average kinetic energy? A) It is the same for both because the temperatures are the same. B) The helium molecules do because they are monatomic. C) The helium molecules do because they are less massive. D) The oxygen molecules do because they are diatomic. A) It is the same for both because the temperatures are the same.(this multiple choice question has been scrambled) In order to double the average speed of the molecules in a given sample of gas, the temperature (measured in Kelvin) mus A) increase by a factor of square root three of its original value B) increase by a factor of square root two of its original value C) quadruple D) double B) increase by a factor of square root two of its original value(this multiple choice question has been scrambled) The temperature of an ideal gas increase from 2C to 4C while remaining at constant pressure. What happens to the volume of the gas? A) It decreases slightly B) It increases to twice as much C) It decreases to one-half its original volume D) It increases slightly D) It increases slightly(this multiple choice question has been scrambled) On a temperature vs. time graph for a substance being heated uniformly, what are the formulas for Q? Q=mcAt for rising temperature, constant phaseQ=mL for contant temperature, changing phase Authormegame623 ID133661 Card SetCh 10, 13, 14, 15 DescriptionAP physics quiz questions, AKA study guide Updated2012-02-08T04:11:07Z Show Answers