General Physics I
General Physics I PHYS 1401
University of Texas-Pan American (UTPA)
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This 9 page Class Notes was uploaded by Augustine Ziemann IV on Thursday October 29, 2015. The Class Notes belongs to PHYS 1401 at University of Texas-Pan American (UTPA) taught by Dorina Chipara in Fall. Since its upload, it has received 21 views. For similar materials see /class/231309/phys-1401-university-of-texas-pan-american--utpa- in Physics 2 at University of Texas-Pan American (UTPA).
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Date Created: 10/29/15
Chapter 9 3 0quot 9 O N In an elastic solid there is a direct proportionality between strain and a elastic modulus b temperature c crosssectional area d stress The bulk modulus of a material as a meaningful physical property is applicable to which of the following a only solids b only liquids c only gases 1 solids liquids and gases Bar One has a Young s modulus that is bigger than that of Bar Two This indicates Bar One a is longer than Bar Two b has a greater crosssectional area than Bar Two c has a greater elastic limit than Bar Two I is made of material that is di erent from Bar Two A tire stops a car by use of friction What modulus should we use to calculate the stress and strain on the tire a Young s modulus b compression modulus c shear modulus d bulk modulus A copper wire of length 20 m cross sectional area 71 x 1076 m2 and Young s modulus 11 x 1010 Nm2 has a 200kg load hung on it What is its increase in length g 98 msz a 050 mm b 10 mm c 25 mm d 50 mm How large a force is necessary to stretch a 20mmdiameter steel wire Y 20 x 1011 Nmz by 10 a 31 x 103 N b 63 X 103 N c 94 x 103 N d 13 x 104 N The pressure inside a commercial airliner is maintained at 100 atm 105 Pa What is the net outward force exerted on a 10 m x 20 m cabin door if the outside pressure is 030 atm O N O N N N l a 140 N b 1 400 N c 14 000 N d 140 000 N A solid object is made of two materials one material having density of 2 000 kgm3 and the other having density of 6 000 kgm3 If the object contains equal volumes of the materials what is its average density a 3 000 kgm3 b 4 000 kgm3 c 5 300 kgm3 d more information is needed A solid object is made of two materials one material having density of 2 000 kgm3 and the other having density of 6 000 kgm3 If the object contains equal masses of the materials what is its average density a 3 000 kgm3 b 4 000 kgm3 c 5 300 kgm3 d more information is needed In a large tank of liquid the hydrostatic pressure at a given depth is a function of a depth b surface area c liquid density d Choices a and c are both valid Atmospheric pressure is 10 x 105 Nmz and the density of air is 129 kgm3 If the density of air is constant as you get higher and higher calculate the height of the atmosphere needed to produce this pressure a 7900m b 77 000 m c 1260 m d 10 300 m What volume of water is displaced by a submerged 20kg cylinder made of solid aluminum aluminum density 27 x 103 kgm3 and water density 10 gtlt 103 kgm3 a 74 gtlt10quotm3 b 14 x 103m3 c 99 x 103m3 1 60 x 102 III3 As ice oats in water about 10 of the ice oats above the surface of the water If we oat some ice in a glass of water what will happen to the water level as the ice melts a The water level will rise 10 of the volume of the ice that melts b The water level will rise but not as much as the 10 indicated in answer a c The water level will remain unchanged d The water level will become lower Chapter 10 5 0quot 9 LN O N N What is the temperature of a system in thermal equilibrium with another system made up of water and steam at one atmosphere of pressure a 0 F b 273 K c 0 K d 100 C Which best describes a system made up of ice water and steam existing together a absolute zero b triple point c ice point d steam point A substance is heated from 15 C to 35 C What would the same incremental change be when registered in kelvins a 20 b 40 c 36 d 313 An interval of one Celsius degree is equivalent to an interval of a one Fahrenheit degree b one kelvin c 59 Fahrenheit degree d 59 kelvin What happens to a given mass of water as it is cooled from 4 C to zero a expands b contracts c vaporizes d Neither expands contracts nor vaporizes Which best expresses the value for the coef cient of volume expansion for given material as a function of its corresponding coef cient of linear expansion 0 a a3 b 3a c a2 d 2a A steel plate has a hole drilled through it The plate is put into a furnace and heated What happens to the size of the inside diameter of a hole as its temperature increases a increases W U W O 4 N b decreases c remains constant d becomes elliptical What happens to a given volume of water when heated from 0 C to 4 C a density increases b density decreases c density remains constant d vaporizes What happens to a volume of water when its temperature is reduced from 8 C to 4 C a density increases b density decreases c density remains constant d vaporizes The thermal expansion of a solid is caused by a the breaking of bonds between atoms b increasing the amplitude of the atoms vibration c increasing the distance between equilibrium positions for the vibrating atoms d all of the above The coef cient of area expansion is a half the coef cient of volume expansion b three halves the coef cient of volume expansion c double the coefficient of linear expansion d triple the coef cient of linear expansion What happens to its moment of inertia when a steel disk is heated a It increases b It decreases c It stays the same d It increases for half the temperature increase and then decreases for the rest of the temperature increase An ideal gas is con ned to a container with adjustable volume The number of moles and temperature are constant By what factor will the volume change if pressure triples a 19 b 13 c 30 d 90 How many atoms are present in a sample of pure iron with a mass of 300 g The atomic mass of iron 56 and M 602 x 1023 a 18 x 1019 b 67 x 1022 c 16 x 1028 d 32 x 10 46 Two moles of nitrogen gas are contained in an enclosed cylinder with a movable piston Ifthe molecular mass of nitrogen is 28 how many grams of nitrogen are present a 014 b 56 c 42 d 112 kl O Two moles of an ideal gas at 30 atm and 10 C are heated up to 150 C If the volume is held constant during this heating what is the nal pressure a 45 atm b 18 atm c 014 atm d 10 atm The absolute temperature of an ideal gas is directly proportional to which of the following properties when taken as an average of the molecules of that gas 0 00 a speed b momentum c mass d kinetic energy If the temperature of an ideal gas contained in a box is increased 1 O a the average velocity of the molecules in the box will be increased b the average speed of the molecules in the box will be increased c the distance between molecules in the box will be increased d all of the above I 0 A quantity of a monatomic ideal gas expands to twice the volume while maintaining the same pressure If the internal energy of the gas were U0 before the expansion what is it after the expansion a U0 b 2 Di c 4 U0 d The change in temperature must also be known to answer this question Chapter 11 2 Of the following systems which contains the most heat a 100 kg of water at 80 C b 250 kg ofwater at 40 C c 600 kg ofice at 0 C d Systems do not contain heat 3 Heat ow occurs between two bodies in thermal contact when they differ in what property a mass b speci c heat c density d temperature 3 Heat ow occurs between two bodies in thermal contact when they differ in what property a mass b speci c heat c density 1 temperature 14 An inventor develops a stationary cycling device by which an individual while pedaling can convert all of the energy expended into heat for warming water How much mechanical energy is required to increase the temperature of 300 g of water enough for 1 cup of coffee from 20 C to 95 C 1 cal 4186 I the specific heat ofwater is 4 186 Jkg C a 94 000 J b 22 000 J c 5 400 I d 14 J A solar heated house loses about 54 x 107 cal through its outer surfaces on a typical 24h winter day What mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62 C by the solar collectors and the house is maintained at 20 C Speci c heat ofrock is 021 calg C 00 a 163 kg b 1 230 kg c 6 100 kg d 12 700 kg O A 02kg aluminum plate initially at 20 C slides down a l5mlong surface inclined at a 30 angle to the horizontal The force of kinetic friction exactly balances the component of gravity down the plane so that the plate once started glides down at constant velocity If 90 of the mechanical energy of the system is absorbed by the aluminum what is its temperature increase at the bottom of the incline Speci c heat for aluminum is 900 Jkg C a 016 C b 007 C c 004 C d 003 C 20 Awaterfall is 145 m high What is the increase in water temperature at the bottom of the falls if all the initial potential energy goes into heating the water g 98 msz CW 4 186 Jkg C a 016 C b 034 C c 069 C d 104 C N 0 W O W W W l 4 As I use sandpaper on some rusty metal the sandpaper gets hot because a heat is owing from the sandpaper into the metal b heat is owing from the metal into the sandpaper c frictional processes increase the internal energy of the sandpaper d heat is owing from my hand into the sandpaper A 200kg copper rod is 5000 cm long at 23 C If 40 000 J are transferred to the rod by heat what is its change in length saws 387 Jkg C and cam77 17 X 1039 C a 0022 cm b 0044 cm c 0059 cm d More information is needed An 800g piece of copper initially at 295 C is dropped into 250 g of water contained in a 300g aluminum calorimeter the water and calorimeter are initially at 100 C What is the nal temperature of the system Speci c heats of copper and aluminum are 0092 0 and 0215 calg C respectively CW 100 calg C a 128 C b 165 C c 284 C d 321 C Twenty grams of a solid at 70 C is place in 100 grams of a uid at 20 C Thermal equilibrium is reached at 30 C The speci c heat of the solid a is equal to that of the uid b is less than that of the uid c is more than that of the uid d cannot be compared to that of a material in a different phase Iced tea is made by adding ice to 18 kg of hot tea initially at 80 C How many kg of ice initially at 0 C are required to bring the mixture to 10 C Li 333 X 105 Jkg CW 4 186 Jkg C a 18 kg b 16 kg c 14kg d 12 kg I take 10 kg of ice and dump it into 10 kg of water and when equilibrium is reached I have 20 kg of ice at 0 C The water was originally at 0 C The specific heat of water 100 kcalkg C the specific heat of ice 050 kcalkg C and the latent heat of fusion of water is 80 kcalkg The original temperature of the ice was a one or two degrees below 0 C b 780 C c 160 C d The whole experiment is impossible 49 If one s hands are being warmed by holding them to one side of a ame the predominant E gt1 9 O 0 N N form of heat transfer is what process a conduction b radiation c convection d vaporization Chapter 12 Area on a PV diagram has units associated with a energy b momentum c temperature d change in temperature A system is acted on by its surroundings in such a way that it receives 50 I of heat while simultaneously doing 20 J of work What is its net change in internal energy a 70 J b 30 J c zero d 730 J In an isothermal process for an ideal gas system where the intemal energy doesn t change which of the following choices best corresponds to the value of the work done on the system a its heat intake b twice its heat intake c the negative of its heat intake d twice the negative of its heat intake If an ideal gas does positive work on its surroundings we may assume with regard to the gas a temperature increases b volume increases c pressure increases d intemal energy decreases A 4mol ideal gas system undergoes an adiabatic process where it expands and does 20 I of work on its environment What is its change in internal energy a 20 J b 75 J c zero d 20 J Heat is applied to an icewater mixture to melt some of the ice In this process a work is done by the icewater mixture b the temperature increases c the internal energy increases d all of the above are correct 31 According to the second law of thermodynamics which of the following applies to the heat received from a high temperature reservoir by a heat engine operating in a complete cycle a must be completely converted to work b equals the entropy increase c converted completely into intemal energy d cannot be completely converted to work
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