# Lance

Most popular questions and responses by Lance
1. ## Physics (HELP)

Jill pulls on a rope to lift a 12 kg pail out of a well, while the clumsy jack watches. For a 10.0 meter segment of the lift, she lifts the bucket straight up at constant speed. How much power is required to complete this task in 5 seconds?

2. ## Chemistry

Propane, C3H8, is a common fuel gas. Use the following to calculate the grams of propane you would need to provide 383 kJ of heat. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) ΔH = −2043 kJ

3. ## Chemistry

A sample of ethanol, C2H5OH, weighing 2.84 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rose from 25.00°C to 33.73°C. If the heat capacity of the calorimeter and contents was 9.63 kJ/°C, what is the value

4. ## Noun and Adjective Clauses

Amanda bought a prom dress which she considered the most beautiful dress ever made. Adjective clause:Amanda bought a prom dress Word(s) modified:dress

5. ## bobpursley, drwls. ms. sue Writeacher

When a second post is made to a question, the most recent is now at the bottom. Do any of you prefer the way it was, or do you like this better? I prefer to have the answers shown in the order they were posted. The second answer may clarify or add

6. ## Math

If an elliptic race track is 100 yards long and 20 yards wide, then how far apart are the foci?

7. ## Phase

http://en.wikipedia.org/wiki/Melting_point Question: A solid substance has a vapor pressure of 100 mmHg at the melting point (100C). Assuming an atmospheric pressure of 760 mmHg, describe the behavior of this solid as the temperature is raised from room

8. ## Chemistry

Calculate the calorimeter constant if 25g of water at 50C was added to 25g of water at 25C with a resulting temperature of 35C? The answer is 52.3 but I do not know how to get to this. I hope someone can help. Thanks!

9. ## Chemistry

Assume the heat absorbed by the calorimeter was 200J. What is the calorimeter constant (Heat Capacity) if the temperature changed from 22C to 26C? I know the answer is 50 J/k. But I am not sure how to get this.

10. ## Chemistry

For each of the following pairs of elements, state whether the binary compound formed is likely to be ionic or covalent. Give the formula and name of the compound. (a) C, Cl Its covalent, but I get the formula wrong and name wrong,CCl Carbon Chloride.

11. ## Chemistry

Assume a piece of hot metal is added to a calorimeter containing 50mL of water at 22C. The amount of heat released by the metal was determined to be 1000J, and the equilibrium temperature in the calorimeter was 26C. Remembering that the specific heat of

12. ## Chemistry

Calculate the molar heat of neutralization in kj/mol of the reaction between HA and BOH given the following information: The temperature change equals 9C 50mL of 1M concentration of Acid 50ml of 1M concentration of Base Heat Capacity of the calorimeter is

13. ## Chemistry

Assume a piece of hot metal is added to a calorimeter containing 50mL of water at 22C. The amount of heat released by the metal was determined to be 1000J, and the equilibrium temperature in the calorimeter was 26C. Remembering that the specific heat of

14. ## PHYSICS

A 745i BMW car can brake to a stop in a distance of 122 ft from a speed of 60.0 mi/h. To brake to a stop from a speed of 80.0 mi/h requires a stopping distance of 221 ft. What is the average braking acceleration for the following intervals? Express the

15. ## SCIENCE

Please don't do that again or you will be banned from this forum.Your question is pretty vague. What observation table are you using? There are thousands of different types of data tables. Is it in Microsoft Excel? Give more details. Try reposting your

16. ## chemistry

Consider the reaction 2Al + 3CuSO4 = Al2(SO4)3 + 3Cu What is the maximum amount of Cu (63.5 g/mol) that could be produced by reacting 20.0 grams of Al (27.0 g/mol) with excess How do i do this?

17. ## Chemistry

A neutral molecule is identified as a tetrafluoride, XF4, where X is an unknown atom. If the molecule has a dipole moment of 0.63 D, can you give some possibilities for the identity of X? (Select all that apply.) sulfur nitrogen oxygen polonium phosphorus

18. ## Chemistry

A particular microwave oven delivers 800 watts. (A watt is a unit of power, which is the joules of energy delivered, or used, per second.) If the oven uses microwave radiation of wavelength 12.2 cm, how many photons of this radiation are required to heat

20. ## Physics

A 500-mL beaker has a mass of 250 g when empty and 645 g when filled with an unknown liquid. What is the density of the liquid?

21. ## physics

You see an optical illusion of an ever-upward spiral staircase. The climber trudges up and up and never gets anywhere, going in circles instead. Suppose the staircase is provided with a narrow ramp, allowing the tired stair-climber to push a wheelbarrow up

22. ## Physics

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 18.5o below the horizontal. It strikes the ground 3.30 s later. How far horizontally from the base of the building does the ball

23. ## Chemistry

At what speed must a neutron travel to have a wavelength of 9.2 pm?

24. ## math

An airplane flying against the wind travels 100 miles in the same amount of time it would take the same plane to travel 140 miles with the wind. If the wind speed is a constant 40 miles per hour, how fast would the plane travel in still air?

25. ## Chemistry

Hydrogen is burned in oxygen to release heat. How many grams of hydrogen gas must be burned to release enough heat to warm a 50.0 g block of iron, giving 5 mol of water? 2 H2(g) + O2(g) → 2 H2O(g) ΔH = −484 kJ Iron has a specific heat of 0.449

27. ## sci

There is a lot on this at: http://fig.cox.miami.edu/~cmallery/150/life/top_10_life.htm Make sure and go all the way to the bottom when you get there. characteristics of living things

28. ## geometry

What are the equations of the lines through (-5, -3) and passing at distance 2sqrt5 from (5,7)? This problem is confusing? How do I solve this? Please I need your Help

29. ## Finance

A firm has ROA of 14% and a debt/equity ratio of 0.8. The ffirms ROE is?

30. ## Maths

Three boys shared some cards. Peter had twice as many cards as Farid. The ratio of the number of cards Peter had to the number of cards Kiran had was 6:5. Farid gave 2/3 of his cards to Peter and the rest to Kiran. How many cards did Kiran have at first if

31. ## Chemistry

When ice at 0°C melts to liquid water at 0°C, it absorbs 0.334 kJ of heat per gram. Suppose the heat needed to melt 30.7 g of ice is absorbed from the water contained in a glass. If this water has a mass of 0.189 kg and a temperature of 21.0°C, what is

32. ## Physics

A banked circular highway curve is designed for traffic moving at 60 km/h. The radius of the curve is 207 m. Traffic is moving along the highway at 42 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow

33. ## Physics (HELP)

An object is placed at a distance of 6 cm from a concave mirror and an image is produced at a distance at a distance of 14 cm from the mirror. What is the focal length?

34. ## Science

Batteries change ____ energy into _____ energy Chemical and electric Converting the suns energy into electricity does not work if it is ____ time or there is ___ weather night and bad? The suns energy can be turned into electrical energy or ___ energy

35. ## Analytic Geometry

A point is equidistant from (-2,4) and (3,5). It is also equidistant from (-2,-3) and (6,-1). Find the point Please I need Help with this

36. ## Reposting Chemistry College

Based on the balanced equation 4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2 molecules react? Thanks.

37. ## math

Triangle GHI is an isosceles triangle. H is the vertex. If the measure of H is 73 degrees what is the measure of G? A.73 B.17 C.34 D.104 A)73 degrees?

38. ## Math perimeter

How many inches of matting are needed to frame an 8in by 11 in print? 38?

39. ## Chemistry

At what speed must an electron travel to have a wavelength of 13.6 pm? I got 9.89x10^-15 as the answer and its wrong where did I mess up in my calculations?

40. ## psychology

We don't just answer questions here. We help. So at least tell us your best thought out answer and why you chose it. Then we'll help. A truck gets stuck under a bridge. Several tow-trucks are unable to pull it ou. At last a little boy walks up and asks the

41. ## Calculus

The length l of a rectangle is decreasing at the rate of 3cm/sec, while its width w is increasing at the rate of 3cm/sec. Find the rates of change of (1.) the area, (2.) the perimeter, (3.) the length of one diagonal at the instant when l=15 and w=6.

42. ## College Chemistry

A gas containing carbon and hydrogen analyzed as 85.6 % carbon and 14.4 % hydrogen. A 42.1 g sample of a gas occupied a volume of 7490 mL with a pressure of 2280.0 torr at 92 °C. Enter the molecular formula of the compound. Thanks.

43. ## ELA

We have to find 20 collective nouns in a magazine. So far are all of these collective? 1.partners 2.Birds 3.Family 4.Amphibians 5.Crustaceans 6.builders 7.Immigrants 8.Animals 9.Grades 10.Services 11.packages 12.lodges 13.Members 14.Branches

44. ## Calculus- Related rates

A spherical balloon is inflated at the rate of 1 cm^3 per minuter. At the instant when the radius r=1.5, (a.) how fast is the radius increasing? (b.) how fast is the surface area increasing?

45. ## Analytic Geometry

A point is equidistant from (-2,4) and (3,5). It is also equidistant from (-2,-3) and (6,-1). Find the point Please I need Help with this

46. ## Chemistry

How much heat is released when a mixture containing 12.6 g CS2 and 13.2 g Cl2 reacts by the following equation? CS2(g) + 3 Cl2(g) → S2Cl2(g) + CCl4(g) ΔH° = −230. kJ

47. ## Chmistry

Any object, be it a space satellite or a molecule, must attain an initial upward velocity of at least 11.2 km/s in order to escape the gravitational attraction of the earth. What would be the kinetic energy in joules of a satellite weighing 2337 lb that

48. ## math

Brandon and Jacob buy used cars at the same time. Brandon buys a car with 10,000 miles on it. He drives an average of 100 miles a week. The equation that follows can be used to determine how many miles, m, will be on the car after any number of weeks of

49. ## Statistics

A study on the amount of dye needed to get the best color for a certain type of fabric was conducted. The following data give the photometer readings for the color density of the fabric when the amount of dye used was 1% of the weight of the fabric. 13.2

50. ## College Chem

Based on the balanced equation 4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2 molecules react? Thanks.

51. ## Chemistry

What is the energy of a photon corresponding to radio waves of frequency 1.475 106 /s? I got 9.77e-28 as an answer and its wrong so what is wrong with my calculations.

52. ## Chemistry

Nitrous oxide, N2O, has been used as a dental anesthetic. Suppose that the average speed of an N2O molecule at 25°C is 377 m/s. (It is actually 379 m/s.) Calculate the kinetic energy (in joules) of an N2O molecule traveling at this speed.

53. ## Physics

What is the gauge pressure at the bottom of a pool 1.9 m deep?

54. ## Analytic Geometry

A parabola has a directrix y=-3, axis =4 and latus rectum equal to 2. find its equation. Please help me its for my homework

55. ## Analytic Geometry

What are the equations of the circles tangent to the x-axis, of radius 4 and whose center is at (-2,y) Please help, how do I solve this problem?

56. ## College Chem

Based on the balanced equation 4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2 molecules react? Thanks.

57. ## Chemistry

What is the wavelength of the electromagnetic radiation emitted from a hydrogen atom when the electron undergoes the transition n = 5 to n = 3?((Broken Link Removed) is a spectrum m In what region of the spectrum does the line occur? near ultraviolet far

58. ## Physics

To stop a car, first you require a certain reaction time to begin braking. Then the car slows down at a constant rate. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 85.0 km/h, and 24.4 m when

59. ## Chemistry

(a) A 102-g sample of water is placed in an insulated container and allowed to come to room temperature at 21°C. To heat the water sample to 41°C, how much heat must you add to it? kJ (b) Consider the hypothetical reaction, being run in an insulated

60. ## Math Puzzler For Ken and BobPursley

Below is the original question and emailed response from my friend, Dr Ford, a theoretical physicist at Tufts University in Boston. Question: We have a normal watch. The big hand is 4cm long and the little hand is 3cm long. What's the distance between the

61. ## Physics

What is the mass of a rectangular shaped ice block with dimensions of 0.04m x 0.05m x 0.03m if the density of ice is 917 kg/m3?

62. ## Math,Geometry

What are the equations of the lines through (-5,-3) and passing at distance 2sqrt5 from (5,7) Please I really need your help. I do not know how to do this problem.

63. ## math

How many inches of matting are needed to frame an 8 in by 11 in print 38in?

64. ## Math

Write a story for the following multiplication problem : 16x5 Derrick gets \$5 for every hour he works at the store. He works for 16 hours each day. How much money does he get everyday? Is that a good problem? Write a story for the following multiplication

65. ## Chemistry

A sample of cesium metal reacted completely with water, evolving 48.7 mL of dry H2 at 24°C and 774 mmHg. What is the equation for the reaction? (Include states-of-matter under SATP conditions in your answer. Use the lowest possible coefficients.) What was

66. ## Chemistry

A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 27.1 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?

67. ## Finance

Solve for x. 10000 = 2500(1.0425)^3 + X(1.0425)^2 + 3500(1.0425)^1

68. ## Chemistry (Need) 7:00

What characterizes the electron configurations of transition metals such as silver and iron? Thanks Alot in Advance.. Fe is in the 3d transition series and Ag is in the 4d series. Thus, the distinguishing electron for the 3d series enters the 3d orbital

69. ## Chemistry

catalyst: a substance that changes the speed of a chemical reaction without affecting the yield or undergoing permanent chemical change* As you can see NO (nitrogen monoxide) did not undergo a permanent change.

70. ## Math

Help Please! The LCM of two numbers is 60. The GCF of the numbers is 5. One number is 5 more than the other. The numbers are________ and __________ Please help clueless in Massachusetts

71. ## physics

Find the field produced by a uniformly charged sheet carrying 93pC/cm2 .

72. ## Statistics

The inside diameter of the automobile wheel bearing sets at a factory is expected to be normally distributed with a mean of 1.30inches and a standard deviation of 0.04 inches. What is the probability that a randomly selected wheel bearing will have an

73. ## Math,Geometry

What are the equations of the lines through (-5,-3) and passing at distance 2sqrt5 from (5,7) Please I really need your help. I do not know how to do this problem.

74. ## Finite Math- help wanted. Super hard!

In a past presidential election, it was estimated that the probability that the Republican candidate would be elected was 2/3, and therefore the probability that the Democratic candidate would be elected was 1/3 (the two Independent candidates were given

75. ## Math

Use estimation to determine which expression has the least value A. 5 3/4 + 2 1/4 - 2 1/8= 8? B. 6 1/4 + 1 - 1 1/4= 6? C.8 1/3 - 1 1/2 + 1 1/3= 7? D? 12 2/5 - 5 +2 4/5= 10? B has least value

76. ## Math

School is out at 3:50 pm. Band practice is 2 1/2 hrs dinner takes 3/4 of an hour homework takes 1 1/4 hrs. You have to go to bed at 10. About how much time is left to play video games? A. 3 1/2 B.5 hours C.1 hour D. 2 hours D?

77. ## Chemistry

The triation of 50.00 mL of 0.025 00 M MES with 0.100 0 M NaOH. MES is a weak acid with pKa=6.27. Compute Ve, first. Show what happens at the four stages of the titration: Va = 0,2,5,10,10.1,11,12, and 12.2 mL. I NEED HELP!!!!

78. ## algebra

The half-life of 234U, uranium-234, is 2.52 105 yr. If 98.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

79. ## Social Studies

The largest island in the world, locates near Canda is called______. I think it's Greenland

80. ## Chemistry

The specific heat of copper metal was determined by putting a piece of the metal weighing 39.4 g in hot water. The quantity of heat absorbed by the metal was calculated to be 47 J from the temperature drop of the water. What was the specific heat of the

81. ## college

A 26 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical. What is the tension in the cables? help please!

82. ## Finance

How much cash must be deposited in a savings account In Order To Accumulate 50,000 At End Of 7 Years With 12 % Interest Rate?

83. ## history

http://momo.essortment.com/versaillestrea_reif.htm http://en.wikipedia.org/wiki/Treaty_of_Versailles

84. ## science

Look at the picture on the immediate left here: http://en.wikipedia.org/wiki/Earth's_magnetic_field Also: http://image.gsfc.nasa.gov/poetry/magnetism/magnetism.html HOW IS THE EARTH'S MAGTISM USEFUL thanks it helped me alot!!!!!!!!!!!

85. ## scientific method

http://classweb.gmu.edu/biologyresources/writingguide/ScientificPaper.htm What are the steps of the scientific method? I think this should add a little more to answering your questions. First you have to decide what question(s) you want to answer â€”

86. ## Physics

A copper cylinder with a cross-sectional area 0.034 m^2 is placed vertically on a tabletop. What is the weight of the cylinder if it exerts an 800 Pa of pressure on the table top?

87. ## Physics (HELP)

When light goes from a medium that is less dense to a medium that is more dense, the angle of the refraction is greater than the angle of the incidence

88. ## Chemistry

Sodium + Sulfuric Acid and Phosphoric Acid + Magnesium Hydroxide a.write the formula b. supply the product c.type of reaction d. balancing

89. ## Math

Triangle ABC is an isosceles triangle If the measure of B is 37 degrees what is the measure of C? A.37 B.53 C.106 D.143 I think it's A or C?

90. ## Geometry

What is the equation of a line through (-2,5) and whose segment intercepted between the axes in the 2nd quadrant is 7sqrt2? Please help me solve this

91. ## Math

A highway construction warning sign blinks on and off. In all, the sign is on for 0.88 of each minuite. For how many seconds is the sign on in 5 minutes?

92. ## Science

We have to build a catapult that can launch a marshmallow at least 10 feet. Can anyone give me any ideas?

93. ## Math

Maria served 4 1/7 loaves of banana bread and 4 2/3 loaves of cranberry bread. About how many slices of bread did she serve A.80 B.72 C.64 D.32

94. ## Math

2.36 rounded to the tenths place

95. ## College chemistry

Need help balancing chemical equation. Complete and balance the chemical equation. Be sure to include the states of the reactants and products. C3H8(g)+O2(g) →

96. ## Chemistry College

A 79.1 g mixture of the compounds calcium chloride and sodium sulfide is 80.9 % by mass sodium sulfide. The compound sodium sulfide is 58.9 % by mass sodium. Calculate the mass (g) of sulfur in the mixture. thanks.

97. ## Chemistry

A mixture of the compounds magnesium oxide and calcium sulfide contains 21.6999 g of magnesium oxide and is 51.3 % by mass magnesium oxide. The compound calcium sulfide is 44.400 % by mass sulfur. Calculate the moles of sulfur in the mixture. I'm not sure

98. ## Social Studies

In what city did Rosa Parks defy the rules of segregation?

99. ## Geometry

2. Segment RT is the midsegment of the trapezoid. Find x.