# Questions Asked onNovember 10, 2010

1. ## Social Studies

Hi Jiskha!! I have been researching the Civil war and wanted to know it you can add to this. No this is not my work it is essays and summary's i found on the computer, this is what I found: Summary of the Civil War: Fought 1861-1865, the American Civil War

2. ## PHYSICS

A 27.0 kg child on a 3.00 m long swing is released from rest when the swing supports make an angle of 31.0° with the vertical. Neglecting friction, find the child's speed at the lowest position.

3. ## chemistry

What is the net ionic equation for the reaction of formic acid, HCOOH, with NH3? A. H+(aq) + NH3(aq) → NH4+(aq) B. H+(aq) + OH–(aq) → H2O(l) C. HCOOH(aq) + NH3(aq) → NH4+(aq) + HCOO–(aq) D. HCOO–(aq) + H+(aq) + NH3(aq) → NH4HCOO(aq) E.

4. ## chemistry

A 100.0 ml sample of 0.300 M NaOH is mixed with a 100.0 ml sample of 0.300 M HNO3 in a coffee cup calorimeter. Both solutions were initially at 35.0 degrees celcius; the temperature of the resulting solution was recorded at 37.0 degrees celcius. Determine

5. ## chemistry

Determine the theoretical yield of C when each of the following amounts of A and B are allowed to react in the generic reaction: A+2B-->3C 1) 1mol A; 1 mole B 2) 1mole A; 3 mole B 3) 2mole A; 2 mole B 4) 32mole A; 68 mole B

6. ## Chemistry

Which formula represents a molecular compound? (1) Kr 3) N2O4 (2) LiOH (4) NaI How do you know?

7. ## Chemistry

Why do magnesium, phosphorus, and zinc exhibit slightly higher first ionization energies than the general trend within each of their periods?

Calculate the new molarity if each of the following dilutions is made. Assume the volumes are additive. (a) 52.3 mL of water is added to 27.1 mL of 0.124 M KOH solution (b) 110. mL of water is added to 54.2 mL of 0.808 M NaCl solution ((please show work,

9. ## Chemistry

A solution of I2 was standardized with ascorbic acid. Using a .1000 g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. A. What is the molarity of the iodine solution? B. What is the titer of the iodine solution?

10. ## chemistry

the value for the Ksp of silver chromate is reported to be 1.1 x 10^-12. in a saturated solution of silver chromate, the silver ion concentration is found to be 2.5 x 10^-4M. what must the chromate ion concentration be?

11. ## Physics

A 2.0-cm thich bar of soap is floating on a water surface so that 1.5 cm of the bar is under water. Bath oil of specific gravity 0.60 is poured into the water and floats on top of it. What is the depth of the oil layer when the top of the soap is just

12. ## College Chemistry

please help! You are given an unknown, colorless, solution that may contain only one salt from the following set: NaA, NaB, NaC. In solution each salt dissociates completely into the Na+ ion and the anion A-, B-, or C-, whose properties are A is green, B

13. ## physics

A student (m = 68 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the

14. ## Chemistry ( stoichiometry )

How many grams of iron can be made from 16.5g of Fe2O3 by the following equation: Fe2O3 + 3 H2 -----> 2 Fe + 3 H2O.

15. ## Math: Calculus

The velocity of a car is f(t)=7t meters/second. Use a graph of f(t) to find the exact distance traveled by the car, in meters, from t = 0 to t = 10 seconds

16. ## physics

A 500 g steel block rotates on a steel table while attached to a 2.0-m-long massless rod. Compressed air fed through the rod is ejected from a Inozzle on the back of the block, exerting a thrust force of 3.5 N. The nozzle is 70^\circ from the radial line,

17. ## College Chemistry

A buffer solution contains 0.120M acetic acid and 0.150M sodium acetate. a. How many moles of acetic acid and sodium acetate are present in 50.0 ml of solution? b. if we add 5.55 mL of 0.092M NaOH to the solution in part (a) how many moles of acetic acid ,

18. ## chemistry

A biology experiment requires the preparation of a water bath at 37.0°C (body temperature). The temperature of the cold tap water is 22.0°C, and the temperature of the hot tap water is 55.0°C. If a student starts with 70.0 g of cold water, what mass of

19. ## Chemistry

“1.25 g of crushed limestone was added to 50.0 cm3 of 1.00 mol dm-3 hydrochloric acid (an excess). The mixture was left until all bubbling stopped and was then made up carefully to 250 cm3 with pure water. A 25.0 cm3 sample of this was pipetted into a

20. ## Chem

A sample of gas has a volume of 8.00 L at 20.0 degrees celcius and 700. torr. What will be it's volume at STP?

21. ## Chemistry

A 100.0 ml sample of 0.300 M NaOH is mixed with a 100.0 ml sample of 0.300 M HNO3 in a coffee cup calorimeter. Both solutions were initially at 35.0 degrees celcius; the temperature of the resulting solution was recorded at 37.0 degrees celcius. Determine

22. ## chem

How many moles of O are in 13.0 mol Fe(NO3)3? can you please find this using dymensional analysis and show me how you worked it? Thans

23. ## PHYSICS

a 0.1 kg mass is suspended at rest from a spring near the Earth's surface, the distance that the spring is stretched is measured to be 1.0 cm. What is the spring constant of the spring (remember the MKS units)? A mass of 2 kg is attached to a spring with

24. ## Chemistry

A solution of I2 was standardized with ascorbic acid. Using a .1000 g sample of pure ascorbic acid, 25.32 mL of I2 were required to reach the starch end point. A. What is the molarity of the iodine solution? B. What is the titer of the iodine solution?

Suppose that the veterans of the Korean War and the veterans of WWII are mutually exclusive. Together, the veterans of the Korean War and the veterans of WWII, account for X% of the veterans in the United States in 2009. The number of veterans of the

26. ## Physics

A ski gondola is connected to the top of a hill by a steel cable of length 620 m and diameter 1.5 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 14 s for the

27. ## physics

a 0.1 kg mass is suspended at rest from a spring near the Earth's surface, the distance that the spring is stretched is measured to be 1.0 cm. What is the spring constant of the spring (remember the MKS units)? A mass of 2 kg is attached to a spring with

28. ## AP physics

A 66 kg diver steps off a 13 m tower and drops, from rest, straight down into the water. If he comes to rest 4.4 m beneath the surface, determine the average resistance force exerted on him by the water.

29. ## chemistry

What total volume (in lhter at 600 C and 1atm.) could be formed by the decomposition of 16g of NH4NO3 ?

30. ## math

a pronghorn antelope can travel 105 miles in three hours.if it continuedntraveling at the same speed,how far could a pronghorntravel in 11 hours

31. ## Physics

A 0.145 kg baseball pitched at 37.5 m/s is hit on a horizontal line drive straight back toward the pitcher at 48.0 m/s. If the contact time between bat and ball is 3.50×10^−3 s, calculate the average force between the ball and bat during contact.

32. ## math

kyle had 36 books in hislocker. some were library books, some were textbooks, and the rest were telophone books. the number of library books and textbooks combined equal twice the number of textbooks. the number of textbooks and telephone books combined

33. ## physics

Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is 172 \rm Hz. You are 8.00 \rm m from speaker A. Take the speed of sound in air to be 344 \rm m/s. What is

34. ## chemistry

which of the folllowing species is not isoelctric with any of the others? a)V3+ b)Ca2+ c)Ar d)CL- e)S2-

35. ## Chemistry

Ethane (C2H6) burns with oxygen to produce carbon dioxide and water. A sample of ethane was burned completely and the water that formed had a mass of 1.61g. How much ethane, in moles and in grams, was in the sample?

36. ## ap physics

Starting from rest, a 10.2 kg block slides 2.90 m down a frictionless ramp (inclined at 30.0° from the floor) to the bottom. The block then slides an additional 4.80 m along the floor before coming to a stop. Determine the coefficient of kinetic friction

37. ## physics

During a transatlantic flight, you drink a bottle of water and tightly close its lid again. Back on the ground during taxiing to the terminal, you notice that the thin plastic bottle is crushed, and you eyeball it to be only about 70 percent of its

38. ## Chemistry

What mass of benzene(C6H6, molar mass=78.11g/mol) is required to produce 1500 kJ of heat according to the following reaction? 2C6H6(l)+15O2(g) -> 12CO2(g) +6H2O(g) delta H= -6278 I must have tried this so many times. Can you please show me how this is

39. ## Chemistry

If the pH of grapefruit is 3 and the pH of beer is 5, how many times more acidic is the grapefruit juice than the beer? According to the logarithmic scale

40. ## ENGLISH

An angel, robed in spotless white, Bent down and kissed the sleeping Night. Night woke to blush; the sprite was gone. Men saw the blush and called it Dawn. Paul Laurence Dunbar I have a few questions on this poem which I do not understand and would like if

41. ## Physics

You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 51 km/h (32 mph). A new model of mass 1900 kg takes 0.18 s from the time of impact until it is brought

42. ## Chemistry

Ethane (C2H6) burns with oxygen to produce carbon dioxide and water. A sample of ethane was burned completely and the water that formed had a mass of 1.61g. How much ethane, in moles and in grams, was in the sample?

43. ## chemistry

What total volume (in lhter at 600 C and 1atm.) could be formed by the decomposition of 16g of NH4NO3 ?

44. ## College Algebra

The population of the Earth is approximately 6 billion people and is growing at an annual rate of 1.9%. Assuming a Malthusian growth model, find the world population in 45 years. (Round your answer to one decimal place.)

45. ## College Physics

A child swings a yo-yo of weight mg in a horizontal circle so that the cord makes an angle of 30 degrees with the vertical. Find the centripetal acceleration.

46. ## Physical Chemistry

Calculate the standard reaction Gibbs energy of the oxidation of ammonia to nitric oxide according to the equation 4 NH3g) + 5O2(g) → 4 No(g) + 6 H2O(g).

47. ## Physics

Eight books, each 4.1 cm thick with mass 1.8 kg, lie flat on a table. How much work is required to stack them one on top of another?

48. ## Physics

Calculate the force exerted on a rocket, given that the propelling gases are expelled at a rate of 1800 kg/s with a speed of 3.8×104 m/s (at the moment of takeoff).

49. ## chemistry

What is the molarity of a potassium hydroxide solution if 38.65 mL of the KOH solution is required to titrate 25.84 mL of 0.1982 M hydrochloric acid solution?

50. ## accounting

herman company received proceeds of $188,500 on 10-year, 8% bonds issued on january 1, 2009. the bonds had a face value of$200,000, pay interest semi-annually on june 30 and december 31, and have a call price of 101. herman uses the straight-line method

What is the probability that a 8-digit phone number contains at least one 5? (Repetition of numbers and lead zero are allowed).

52. ## Science

How many atoms of aluminum can be produced by the decomposition of 47.1 g of Al2O3? (Hint: Write and balance the equation first.) The products are oxygen gas and aluminum metal (Al) A) 1.11 X 10^24 Al atoms B) None of these C) 1.39 X 10^23 Al atoms D) 5.56

53. ## chem

for a combination reaction, it was calculated that 7.59g of A would exactly react with 4.88g of B. these amounts were reacted, and 9.04g of product was isolated. what was the percentage yield of reaction??

54. ## Chemistry

Discuss how to prepare 250.0 ml of an ammonium-ammonia buffer (pkb = 4.70), ph = 9 and total concentration of 0.05M using 0.10 M ammonium chloride and 0.10M aqueous ammonia

55. ## chemistry

I did a lab using an electrochemical cell to establish a relationship between cell potential and concentration. I derived two equations from lines of best fit. One is Cell potential of Ag vs. Cu Concentration: y = -0.04520x+0.5515. The other is cell

56. ## To Cally, linie, mutze, or whoever --

You've been posting under a bunch of different names tonight, including one that borders on the unacceptable. Your posts are currently being blocked to give you time to think of one screen name that IS acceptable, and you can try again tomorrow. Thanks for

57. ## College Chemistry

Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless. When a solution of C is mixed with

58. ## physics

A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +20.5 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +12.0 revolutions. (a) How much time does it take for the bike to

59. ## calculus

Boat A leaves the dock at 12pm heading due South at a constant speed of 20 km/h. Meanwhile, at 12pm Boat B, a pirate ship, is 15 km due West of the dock where boat A started, and is sailing due East at a constant speed of 15 km/h. If the pirates get within

60. ## Physics

A 2.0-cm thich bar of soap is floating on a water surface so that 1.5 cm of the bar is under water. Bath oil of specific gravity 0.60 is poured into the water and floats on top of it. What is the depth of the oil layer when the top of the soap is just

61. ## physical chemistry

Calculate the equilibrium constant (K) for the ammonia synthesis reaction at 25°C and show how K is related to the partial pressures of the species at equilibrium. Consider that the overall pressure is low enough for the gases to be treated as perfect.

This number of tiles will make a rectangle that is 6 tiles wide.

63. ## chemistry

Determine the chloride ion concentration in a solution containing 50.0 g MgCl2 dissolved in 1500 mL of solution. a. 0.350 M b. 0.700 M c. 1.40 M d. 3.17 M e. 6.34 M

64. ## math

"a 6 ft adult has a shadow of 3.6 ft. long. How long is the shadow of a 5-ft child standing next to the adult"

65. ## Physics

A 600-kg weather ballon is designed to lift a 4000-kg package. What volume should the ballon have after being inflated with helium at standard temperature and pressure so the total load can be lifted up? The problem asks for volume. Take it a step

66. ## Physics

A 23 g bullet traveling 220 m/s penetrates a 4.2 kg block of wood and emerges cleanly at 140 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?

67. ## A thanks to Writeacher

THANK YOU lol thank you very much i now understand wat shes sayin myteacher don't really get it either lol wen i asked him in class so thank you very very much

68. ## physics

A girl 36 kg occupies a seat of a swing that this subject by two chains 20 m in length each. If someone drops the girl from an 8 m position below the highest of the swing. What strength exercises it on the girl when she passes through the point lower?

69. ## Physics

Suppose you are standing in the aisle of a bus traveling along a straight road at 100km/h, and you hold a pencil still above your head. Then relative to the bus, the velocity of the pencil is 0km/h, and relative to the road, the pencil has a horizontal

70. ## Chemistry

How do I predict whether the equilibrium lies to the right or left of an Acid-base equation? O[2-](aq) + H2O(l) OH[-] + OH[-]

71. ## Physics

The longer a straw, the harder it is to drink from. If the air pressure is 93300 Pa, and if you could create a perfect vacuum in your mouth, what is the maximum length of a straw that you could still drink from? Density of water: 1000kg/m3. Ignore

72. ## Physics - Mechanics and Ocsillatory Motion

An 8.70 kg block slides with an initial speed of 1.56 m/s up a ramp inclined at an angle of 28.4 with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.62. Use energy conservation to find the distance the block slides

73. ## chem

so i posted this question yesturday and got some help. which is the stuff below. can you look at the last thing i said which was the answer i got by doing what DrBob222 said to do and tell me if its correct.(the question is the first section) thanks chem -

74. ## Chemistry

I keep calculating the square root of 3RT/M, and am not worrying about the temperature. I keep using 238 and 235 as my M when I do calculate it for both isotopes. Then I end up getting 1.00 as my final answer. That can't possibly be correct, can it? The

75. ## Chemistry

Aluminum and chlorine gas react together to make Aluminum chloride. What is the limiting reactant if 20.0g of Al and 30.0g of Cl2 are used?how much aluminum chloride was formed?

76. ## physics

A woman stands on a scale in a moving elevator. Her mass is 71.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force

77. ## MATH

The ratio of the perimeter of triangle KLM to the perimeter of triangle PQR is 5/3 and LM is 4 less than twice QR. Find LM and QR, if Triangle KLM~Triangle PQR. Can someone solve this in ratio and proportion method? Thanks.

78. ## physics

A delivery truck with a mass of 1700 kg is stopped in the street w/o its brakes on, when a small car hits it from behind. The care has a mass of 650 kg, and is traveling at 3.7m/s immediately before it hits the truck. Both the car and the truck have good

79. ## AP physics

A 2.10x10^3 kg car starts from rest at the top of a 5.8 m long driveway that is sloped at 25° with the horizontal. If an average friction force of 4.0X10^3 N impedes the motion, find the speed of the car at the bottom of the driveway. im using the

80. ## Chemistry

What mass of sodium chloride is produced when 10.0g of sodium is reacted with 20.0g of chlorine?

81. ## College Physics

An 8.67-kg block slides with an initial speed of 1.50 m/s down a ramp inclined at an angle of 27.1° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.65. Use energy conservation to find the distance the block

82. ## Math

Write the slope intercept equation for the line that passes through (14,-2) and is perpendicular to 7x-10y=18

83. ## physics

A girl 36 kg occupies a seat of a swing that this subject by two chains 20 m in length each. If someone drops the girl from an 8 m position below the highest of the swing. What strength exercises it on the girl when she passes through the point lower?

84. ## Chemistry

What volume of 0.200 N H2SO4 is required to neutralize a solution containing 8.00 equivalents of NaOH?

85. ## physics

Frosty the Snowman was a jolly happy soul of mass 85 kg. If his initial temperature was -19C , how much heat did he absorb till he was at 25C ?

86. ## Calculus 2

An underground tank full of water has the following shape: Hemisphere - 5 m radius. at the bottom Cylinder - radius 5 m and height 10m in the middle Circular cone radius 5 m and height 4 m at the top The top of the tank is 2 m below the ground surface and

87. ## physics...again :/

A skier starts from rest at the top of a hill that is inclined at 9.9° with the horizontal. The hillside is 160 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the snow is level and the coefficient of

88. ## hypothesis testing and CI

A hypothesis test for a population mean is to be performed at the 5% level of significance. The population standard deviation is known. The hypotheses are H0: ƒÊ = 80 Ha: ƒÊ ‚ 80. A 95% confidence interval for ƒÊ is also constructed. True or

89. ## chemistry

The poison strychnine is a weakly basic compound with Kb = 1.8 „e 10ƒ{6. What is the pH of a 0.058 M solution of strychnine? a. 3.49 b. 7.30 c. 8.26 d. 10.51 e. 12.76

90. ## English (Romeo and Juliet)

Where juliet says: "O romeo, romeo!Wherefore art thou Romeo? Deny thy father and refuse thy name; Or if thou wilt not,be sworn my love, And ill no longer be a Capulet" i don't understand what she is sayin and i don't understand what she means

91. ## geometry

You have isosceles triangle WXY and segment WZ is the perpendicular bisector of segment XY. You have to prove triangle WXY isosceles in only three steps using the theorem: If a point is on the perpendicular bisector of a segment, then it is equidistant

92. ## College Chemistry

I DO NOT understand the following! Please HELP :) 1st Part Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all

93. ## chemistry

How much boiling water would you need in order to raise the bath to body temperature (about 37\rm {}^\circ C)? Assume that no heat is transferred to the surrounding environment.

94. ## british literature

compare and contrast the characterizations of the wanderer and beowulf? i need to know about the characters not the poems.. i been this question for like weeks so and help would be great!! Thank You!!

95. ## Chemistry

For each reaction, complete and balance the equation and give the net ionic equation. a) KOH(aq)+ZnCl2(aq)-> KCl2+ZnOH The second half of the equation is how i had done on the exam but he said its not balanced. How do I balance this? How would it look. I

96. ## english

What literary tradition immediately preceded the novel tradition? short story? romance? fable? i think its a fable?

97. ## college chem

Write a chemical equation to express the fact that, at 0 °C, ice melts by absorbing 334 J of heat per gram of ice.

98. ## Physics II Honors

A 23.0 kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 79.0 N and is directed at an angle of 30.0° above the horizontal. Determine the coefficient of kinetic friction.

99. ## chemistry

An aqueous solution of phosphoric acid, H3PO4, contains 285 g H3PO4 in 400 mL solution, and has a density of 1.35 g/mL. Calculate a. the weight % H3PO4 in this solution. b. the concentration in mol/L of this solution

100. ## Physics last question

A charge of 23.6 is located at (4.37 m, 5.94 m), and a charge of -10.7 is located at (-4.53 m, 6.77 m). What charge must be located at (2.19 m, -2.91 m) if the electric potential is to be zero at the origin?

101. ## physics

A 2.10 103 kg car starts from rest at the top of a 5.8 m long driveway that is sloped at 25° with the horizontal. If an average friction force of 4.0 103 N impedes the motion, find the speed of the car at the bottom of the driveway.

102. ## Calc 3

Find the parametric equations for the tangent line to the curve with the given parametric equations at specified point. x= e^t y=te^t z=te^(t^2) (1,0,0)

103. ## British Literature

"O hear a pensive prisoner prayer" has example of A)an allusion B)parallelism C)alliteration D)internal rhyme i think is C.. just not for sure!

104. ## biology (multiple choice!)

Evolutionary adaptations that help diverse animals exchange matter with the environment include a. gastrovascular activity, two-layered body, and torpedo shape. b. large volume, long tubular body, and wings. c. complex internal structures, small size, and

105. ## British literature

compare and contrast the themes and strutures of Edmunds Spenser sonneet to william shakespeare sonnet 18?? Help PLZ!!! thank you!!

106. ## Spanish 1

51. -"¿Puedes jugar fútbol?" -"_______." a. Sí, quires b. Sí, puedes c. No, no puedo d. No, no necesito jugar C? 52. -"¿Te gustaría ir conmigo?" -"______." a. !Claro que sí! b. El otoño c. De nada d. Hasta luego A? 53. Beatriz y yo _____ a la

107. ## Math: Calculus

Consider the function f(x) whose second derivative is f''(x) = 8x + 4sin(x). If f(0) = 2 and f'(0) = 2, what is f(x)? I got... f'(x)=4(x^2 - cos[x]) and f(x)=(4(x^3 - 3sin[x]))/3 but it's wrong. Can anyone explain to me how to solve this.

its werid finiding 8x - 13 and 7x + 11 but idk if i should add and equl to 360 its paralleograms and finding x its a triangle please help

109. ## college chemistry

The rate of the following reaction: 2 NO2 2 NO + O2, is characterized by the rate constant k = 0.775 L·mol-1s-1. What is the half-life for this reaction at the same conditions when the initial concentrations are 0.0115 M? (Round your answer to 3

110. ## physics

Two particles of mass m1 = 1.0 kg and m2 = 2.6 kg are traveling with velocities v1 = 4.9, and v2 = 2.5 as shown in the figure below. What is the total momentum of this system? Be sure to give the magnitude and direction of the momentum. magnitude 1 kg ·

What are the period and 2 consecutive asymptotes? 1. y= -3tan pi x 2. y= 2 sec 4 x 3.y= csc x/3 4.y = 3cot pi x/3

112. ## Physics

Suppose you are drifting on a lake in a boat that measures 1 m high, 1 m wide, and 3 m long. The water level reaches halfway up the boat. 1. What is the volume of water that is displaced by the boat? (density of water = 1000 kg/m^3 or 1.00 g/cm^3). 2. What

113. ## Math - Calculus 2

An underground tank full of water has the following shape: Hemisphere - 5 m radius. at the bottom Cylinder - radius 5 m and height 10m in the middle Circular cone radius 5 m and height 4 m at the top The top of the tank is 2 m below the ground surface and

114. ## Spanish 1

54. ¿Cuándo vas al centro comercial? a. seis de febrero b. las dos c. el jueves d. son las cuatros Not sure... 56. Me gustaría jugar tenis ____ las clases hoy. a. por b. después c. después de d. los fines de semana C? 57. Mañana vamos ______ parque

115. ## physics

A massive steel cable drags a 15.0 kg block across a horizontal, frictionless surface. A 85.0 N force applied to the cable causes the block to reach a speed of 4.10 m/s in 1.90 s.

116. ## hypothesis testing by mean levels

hi everyone... i have this homework.. i tried to solve it... can anyone check if it's right or not, please?? Question: The maximum acceptable level of a certain toxic chemical in vegetables has been set at 0.2 parts per million (ppm). A consumer health

If you titrate 12.6 mL of an unknown monoprotic (one H) acid with 13.0 mL of 0.140 M NaOH, what will be the concentration of the acid? If you add 23.5g of NaCl to 1.2 kg of water, what will be the boiling point and the freezing point of the new solution?

118. ## Physics

1. Free-fall: A ball is thrown vertically upward. What are its velocity and acceleration when it reaches its maximum altitude? What is its acceleration just before it hits the ground?

119. ## 7th grade social studies.

hi my name is sadaf. i have problems studying and understanding social studies. i don't know what to do my grades are too low. can you please give me some tips and ideas on how i can work on it?

120. ## Calc 3

Find the parametric equations for the tangent line to the curve with the given parametric equations at specified point. x= e^t y=te^t z=te^(t^2) (1,0,0)

121. ## physics

YOU PUSH A REFRIGERATOR WIT HA FORCE OF 50N AND IT MOVES 3 METERS ACROSS THE FLOOR

122. ## Physics

You have probably seen films of astronauts floating weightless in orbiting satellites. People often get the idea that the astronauts are weightless because they are so far from the gravity of the earth. Let us see if that explanation is correct. Typically,

use the activity series to predict if a reaction will occur, complete and and balance your equation. Zn(s)+ Cu(NO3)2

124. ## math

I need help with helping my 11 year old daughter with her homework. She needs to create a easily identifiable 3 sided polygon which would be the perfectly productive polygon. HELP PLEASE!!

125. ## math

If I were taking a trip and it took me three hours to get there and 5 hours to get back, what would be speed have been on the way there if I traveled at 16k/h?

126. ## math

Terms of sequences 15,22,31,42,55 find next 3 terms and the formula also for the sequence

127. ## chemistry

In a buffer solution, if [Aƒ{] < [HA], which of the following must be true? a. pH < pKa b. pH = pKa c. pH > pKa d. pH < 7.00 e. pH > 7.00

128. ## social studies

1. what was the incan capital called? 2. what was the Incan emperor called? 3. who built the cahokia city?

129. ## social studies

Some analysts maintain that the United States is poorly served by a Congress that is often beset by inaction and localism. Supporters of the Congress maintain that the institution is a superior deliberative and representative institution. Which argument is

130. ## French

Can you check this thanks. Un Voyage Directions: Faites une question en utilisant l'inversion. 1. Robert a fait un voyage à Avignon l'année dernière. (que) Answer: Est-ce que un voyage Robert a fait? 2. Il est allé à l'aéroport avec ses copains.

131. ## chemistry

suppose 10 g of sulfur is reacted with 48 g of fluorine gas to make SF6, and after the reaction is complete, the temperature in the flask is 125 C. Find the partial pressure of SF6 in the flask and the mole fraction of SF6 in the 6L flack after the

132. ## World Geograpghy

Fill in the blank... a. The alphabet we use today is based on the one conceived by the ancient ______ of the eastern Mediterranean.

133. ## english

The novel followed the drama as a major form in England. true?

134. ## Statistics

Variables in the dataset dietstudy Variable name Variable description id Patient ID Basetg Pre measurement lev Final tg Post Measur. Level Base wt pre measure level Final wt Post measure level A researches has collected data to investigate a research

135. ## science

what does the statement mean "the properties of salts are diferent from the properties of the elements that go into making them" mean

136. ## English

1. Do not make repairs on the brakes yourself. 2.Maura said that the word lassco comes from a Spanish word that means "snare". 3. The Cherokee Phoenix was the first newspaper printed in an American Indian language. Identify the prepositional phrase and

137. ## Physics

A mass of 1.66 kg stretches a vertical spring 0.312 m. If the spring is stretched an additional 0.136 m and released, how long does it take to reach the (new) equilibrium position again?

138. ## Physical Chemistry

A 100 amino acid folded protein (F) is in equilibrium with it’s unfolded (U) (or denatured) form. Let ΔrH(std) =+347 kJ mol-1 and ΔrS(std) =-1010 J K-1 mol-1 for the equilibrium (F U) at 25℃. (a) Calculate the concentration of protein in each form if

139. ## Science

In our 7th grade Commprehensive science class we are learning about heat. So our project is about how animals adaptions for thermoregulation. And we choose the hooded Seal. We have found three adaptions sso far but the requirements are five. So far we have

140. ## Physics

A 3600 kg open railroad car coasts along with a constant speed of 11.0 m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 3.70 kg/min. Ignoring friction with the tracks, what is the speed of the car after 80.0 min?

141. ## Chemistry help

Cupper (II) sulfate reacts with hydrogen iodide to produce copper iodide, sulfuric acid, and iodine gas. If 10.4g of copper (II) sulfate is used, calculate the number of grams of HI needed and the number of grams of each product produced.

There are 32 more apples than oranges at a fruit stand. How many apples and oranges could there be?

143. ## biology

i would like to know if you could help me figure out the blanks of this question. The pH scale ranges from __ to __.Pure water is ___. An acid is ______ 7 and a base is __________ 7. If you could let me know that would be great thanks

144. ## math

a soccer player scored 41 goal in 84 games.express the payers scoring rat as a unit rte rounded to the nearest thousandth

145. ## english

what does this quote mean? “You can’t go on with just three music companies organizing and distributing 85 percent of the music in the world”.

146. ## english

Mikes car needs a new muffler and new brakes. (Which word needs an aposterphy?)

147. ## Math

In the triangle ABC, angle ABC is x, angle BCA is x+40, and angle CAB is 2x. What is the measure of the largest angle (in degrees) ?

148. ## english

write an essay about failures are the stepping stones to success

149. ## science

what is concentration please say it in an easy to understand answer thank you!

150. ## English

1. The flower shop is on the restaurant. 2. The flowe shop is above the restaurant. 3. The flower shop is over the restaurant. (Thank you. Do we have to use only 'above' when on the first floor, there is a restaurant, and there is a flower shop on the

151. ## math

sketch the curve using the domain, intercepts, symmetry, asymptotes, local max and min and concavity. y= x /(√(x^2) - 1)

152. ## algebra

The perimeter of a rectangle is 96m.The length is 6m more than twice the width. Find the dimension.

If you add 23.5g of NaCl to 1.2 kg of water, what will be the boiling point and the freezing point of the new solution? (Kf=1.86, Kb=0.52) (Please show work, I appreciate everything)

154. ## windows xp command line

create a batch subdirectory on the homework disk and any batch files frome the root directory into the batch subdirectory

155. ## physics... last one

Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in Figure P5.63. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is µk = 0.23.

156. ## Math

Can someone please please help me understand how to go about solving this? (not really answering it, but actually explaining it-pretty please?) "The zipper and the safety pin were invented in the 14th century. The safety pin was invented 44 years before

157. ## chemistry

25 ml HCl x 1L/1000mL x .200HCl/1L = .005 mol HCl. Using the balanced equation from this, how many moles of NaOh will you need to completely neutralize the HCl?

158. ## physics

A rocket-powered hockey puck has a thrust of 4.70 N and a total mass of 2.40 kg. It is released from rest on a frictionless table, 4.80 m from the edge of a 3.00 m drop. The front of the rocket is pointed directly toward the edge. How far does the puck

Hello. Three quick questions that I have worked on just need confirmation. 1. I need to find the intercepts and then use them to graph the equation. 2y-6=2x; I have x = 0 for y - intercept; 2y-6=2(0); 2y-6 = 0; 2y = 6; y = 3. I set y at 0 also. 2 (0) - 6 =

160. ## physics

A delivery truck with a mass of 1700 kg is stopped in the street w/o its brakes on, when a small car hits it from behind. The car has a mass of 650 kg, and is traveling at 3.7m/s immediately before it hits the truck. Both the car and the truck have good