1. Physics

A ball of mass 522 g starts at rest and slides down a frictionless track, as shown below. It leaves the track horizontally, striking the ground a distance x = 0.81 m from the end of the track after falling a vertical distance h2 = 1.03 m from the end of

2. Chemistry

5 orange gas particles 6 blue gas particles 3 green molecules of gas (two particles attached together) If the partial pressure of the diatomic gas is 0.390 atm, what is the total pressure?

3. College Chemistry

Assuming that Ka is 1.85 *10-5 for acetic acid, calculate the pH at one-half the equivalence point and at the equivalence point for titration of 50mL of 0.100M acetic acid with 0.100M NaOH.

4. Chemistry

Which of the following transition metal ions has a color? Cr3+ , hg2+, v2+ How can you predict that? I don't understand!!

5. Chemistry

What is the concentration of a solution made by diluting 95 mL of 6.0 M HCl to a final volume of 750 mL

6. Precalculus

An 18 m tall tree is broken during a severe storm. The distance from the base of the trunk to the point where the tip touches the ground is 12 m. At what height did the tree break?

7. chemistry

Values of the rate constant for the decomposition of N2O5 at four different temperatures are as follows: T(K) k(s^-1) 658....2.14*10^5 673....3.23*10^5 688....4.81*10^5 703....7.03*10^5 The activation energy is 1.02*10^2 kJ/mol. Calculate the value of the

8. Chemistry

A solution is 0.10M Pb(NO3)2 and 0.10M AgNO3. If solid NaCl is added to the solution what is [Ag+] when PbCl2 begins to precipitate? (Ksp PbCl2 = 1.7 x 10^-5; AgCl = 1.8 x 10^-10) The answers is 1.4 x 10^-8 How do I find the answer

9. Chemistry

Zn|ZnCl2(0.00165 M)||CuSO4(0.0125 M)|Cu Find Ecell taking activities into account.

10. Physics

Two blocks rest on slopes of unequal angles, connected by a rope passing over a pulley. If the blocks equal masses, will they remain at rest? Why? Neglect friction.

11. Statistics

John drives to work each morning and the trip takes an average of μ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of σ = 5 minutes. For a randomly selected morning, what is the probability that John’s

12. Physics

A 57 kg boy and a 45 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 1.5 m/s2, determine the magnitude of the acceleration of the boy toward the girl. Answer in

13. physics

In the figure below, a constant force of magnitude 82.0 N is applied to a 2.55 kg shoe box at angle = 64.5°, causing the box to move up a frictionless ramp at constant speed. How much work is done on the box by a when the box has moved through vertical

14. statistics

A researcher wishes to estimate with 95% confidence the proportion of adults who have high speed internet access. Her estimate must be accurate within 4% of the true proportion. 1. Find the minimum sample size needed using a prior study that found that 48%

15. math

The value of a new car decreases exponentially.Suppose your mother buys a new car for 22,000. The value of the car decreases by 20% each year. a.what is the initial price of the car. The decay factor. b. write an equation to model the value of the cars

16. Chemistry

When a wooden log burns it is essentially undergoing a combustion reaction. Explain why the ashes that form when a log burns have a lower mass than the log had before it started burning.

17. precal

A pile driver pounds a steel column into the ground. On the first drive, the column is pounded 1.65 metres into the ground, and on each successive drive it moves 80% as far as it did on the previous drive. The least number of drives required to drive the

18. statistics

What z-score values form the boundaries for the middle 60% of a normal distribution? a. z = +0.25 and z = –0.25 b. z = +0.39 and z = –0.39 c. z = +0.52 and z = –0.52 d. z = +0.84 and z = –0.84

In Jerry Spinelli's book Milkweed does fox furs with beady black eyes symbolize the Gypsys?

20. statistics

What is wrong with the following statements? a) For a large n, the distribution of observed values will be approximately Normal b) 68-95-99.7 rule says that "x bar" should be within m (mean) +/- 2 SD (standard deviation) about 95% of the time c) The

21. ENGLISH

1. Which of the following quotations is the best example of a paradox? (1 point)“I’ll drain him dry as hay. . . ” “Lesser than Macbeth, and greater.” “So well thy words become thee as thy wounds. . . ” 2. Which of the following is an example

22. Chemistry

The standard molar Gibbs free energy of formation of NO2 (g) at 298 K is 51.30 kJ · mol −1 and that of N2O4 (g) is 97.82 kJ · mol −1 . What is the equilibrium constant at 25 ◦ C for the reaction 2 NO2(g) N2O4(g) ?

23. Physics

A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 575 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of

24. Chemistry

Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free

25. Calculus

A particle moves along a horizontal line so that at any time t its position is given by x(t)=cost-t. Time is measured in seconds and x is measured in meters. a.) Find the velocity as a function t. Use your answer to determine the velocity of the particle

26. college algebra

a man left 1\2 of his estate to his wife, 1\6 to his daughter, and the remainder an amount of \$15,000, to his son. How large was the entire estate?

27. math

The height, h(t), of a projectile, in metres, can be modelled by the equation h(t) = 14t – 5t2, where t is the time in seconds after the projectile is released. Can the projectile ever reach a height of 9m? Explain.

28. Math

The doubling time of a city's population is 17 years. How long does it take for the population to quadruple?

29. College Chemistry

calculate the theortetical percentage of water for the following hydrates. Calcium nitrate tetrahydrate Ca(No3)2 X 4H2O

30. thermochemistry

A chemical reaction takes place in a container of cross-sectional area 100 cm2 . As a result of the reaction, a piston is pushed out through 19 cm against an external pressure of 596 torr. What is the value for w for this reaction?

31. Physics

In Case A the mass of each block is 4.8 kg. In Case B the mass of block 1 (the block behind) is 9.6 kg, and the mass of block 2 is 4.8 kg. No frictional force acts on block 1 in either Case A or Case B. However, a kinetic frictional force of 9.4 N does act

32. statistics

A vertical line is drawn through a normal distribution at z = 0.50, and separates the distribution into two sections. What proportion of the distribution is in the larger section? a. 0.6915 b. 0.3085 c. 0.1915 d. 0.3830

33. Chemistry

The combustion of 132 g of propane, C3H8, with excess oxygen liberates 6.6x10^3 kj of heat. What is the enthalpy change for the reaction below: C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(l)

34. Chemistry

Consider the reaction PCl3(ℓ) → PCl3(g) at 298 K. If ∆H◦ is 32.5 kJ/mol, ∆S ◦ is 93.3 J/K mol, and ∆G ◦ is 4.7 kJ/mol, what would be the boiling point of PCl3 at one atmosphere?

35. AP Physics B

A 1010 kg geosynchronous satellite orbits a planet similar to Earth at a radius 1.97 × 105 km from the planet’s center. Its angular speed at this radius is the same as the rotational speed of the Earth, and so they appear stationary in the sky. That is,

36. Economics

A firm uses a single plant with costs C = 160 + 16Q + .1Q2 and faces the price equation P = 96 - .4Q. a. Find the firm’s profit-maximizing price and quantity. What is its profit? b. The firm’s production manager claims that the firm’s average cost of

37. physics

A car is traveling at 60.6 mph on a horizontal highway. The acceleration of gravity is 9.8 m/s2. If the coefficient of friction between road and tires on a rainy day is 0.056, what is the minimum distance in which the car will stop? Answer in units of m. m

38. chemistry

Approximately what electronegativity difference would you expect for a polar covalent bond?

39. geometry

If the endpoints of the diameter of a circle are (3, 1) and (6, 5), find the length of the diameter.

40. pharmacy

prescription chlorpheniramin 100 ml Lidocaine 2 oz banana flavoring 1 tsp Take 7 ml BID refridgerate at 40 degree F What is the total volume in ml?

41. Chemistry

Calculate the number of moles of KIO3 consumed by reaction (2.1). Remember, it is the limiting reagent. Using this information, calculate the number of moles of I- that must have been consumed by reaction. Unbalanced equation: IO -(aq) + I-(aq) + H+(aq) ÿ

42. Statistics

Assume that the average annual salary for a worker in the United States is 300,000- and that the annual salaries For Americans are normally distributed with a standard deviation equal to \$7,000. Find the following: A. What percentage of Americans earn

43. AP chemistry

Given the standard molar entropies measured at 25 C and 1 ATM pressure calculate delta S for the reaction 2al + 3 mg0 ---> 3mg + al2o3

44. Physics

A skier of mass 74.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 55 m up a 31° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?

45. Physics

Two children who are bored while waiting for their flight at the airport decide to race from one end of the 20 -long moving sidewalk to the other and back. Phillippe runs on the sidewalk at 2.0 (relative to the sidewalk). Renee runs on the floor at 2.0 .

46. Physics

Starting from rest, a 11.50 kg suitcase slides 3.18 m down a frictionless ramp inclined at 40° from the floor. The suitcase then slides an additional 5.22 m along the floor before coming to a stop. (a) Determine the suitcase's speed at the bottom of the

47. Physics

b) If the car is moving much faster than the heavier truck when they collide, what best describes the size (or magnitude) of the forces between the car and the truck? 1. Not enough information is given to pick one of these answers. 2. Neither exerts a

48. Physics

A skier travelling 37 mph encounters a 21 degree slope. With friction not considered, how far up the slope will he travel

49. Chemistry

Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free

50. Pre-Calculus

An indoor physical fitness room consists of a rectangular region with a semicircle on each end. The perimeter of the room is to be a 200-meter running track. a) Draw a figure that visually represents the problem. Let x and y represent the length and width

51. Physics

A small plane is 150km south of the equator. The plane is flying at 220km/h at a heading of 30 degrees to the west of north. In how many minutes will the plane cross the equator?

52. Math

Supplier on-time delivery performance is critical to enabling the buyer’s organization to meet its customer service commitments. Therefore, monitoring supplier delivery times is critical. Based on a great deal of historical data, a manufacturer of

53. Precalculus

A fiel is in the shape of a right triangle. The fence around the perimeter of the field measures 40 m. If the length of the hypotenuse is 17 m, what will be the length of other two sides.

54. Social Studies 8R

I need the definition for the following words: Fort Laramie Treaty Interstate Railroad Geronimo I know I have my textbook but it's not in the glossary. Is there a website that have a list of all social studies vocabulary words that is in the 8TH GRADE

55. physics

A cat chases a mouse across a 1.3 m high table. The mouse steps out of the way, and the cat slides oﬀ the table and strikes the ﬂoor 2.1 m from the edge of the table. What was the cat’s speed when it slid oﬀ the table? The acceleration of gravity

56. Math

Triangle with vertices: D(-18,12) E(-6,-12) F(12,6) Show that the right bisectors of the sides of triangleDEF all intersect at point C(-4,4), the circumcentre of the triangle. -I found the midpoint of DF then the slope of the midpoint and point E, then

57. chemistry

Cl2O2 (g)---> 2ClO (g) Time [Cl2O2] (M) 0....... 6.60*10^-8 172..... 5.68*10^-8 345..... 4.89*10^-8 517..... 4.21*10^-8 690..... 3.62*10^-8 862..... 3.12*10^-8 Determine the value of the first-order rate constant. For this question, you need to graph it on

58. Science

A car is traveling down a hill that makes an angle of 14° with the horizontal. The driver applies her brakes, and the wheels lock so that the car begins to skid. The coefficient of kinetic friction between the tires and the road is μK = 0.55.

59. english

workers want tangible rewards such as money and a pension, but they also welcome less concrete benefits, such as acclaim for a job well done.

60. SOCIAL STUDIES PLEESE HELP ME

THE ANSWERS ARE NOT IN MY BOOK, MS SUE AND IF THEY WERE THEN I WOULDN'T ASK FOR HELP Make an organizer to compare government under a republic (the commonwealth), an abcolute monarchy, and a constitutional monarchy. Use the following headings: the ruler,

61. math

if a square lot has an area of 256cm what the length of each side be?

62. Chemistry

What is the concentration of Cu2+ in a solution that is 0.10 M Cu(NH3)4^2+? (Kf = 1.2 x 10^12) The answer is 8.0 x 10^-4 How do I solve the problem to get the answer

63. english

Which one of the following statements is true for the base forms of verb? A. when the subject of a sentence is singular, add "-s" to the base form. B. Add "to" to the base form to create an adjective. C.Do not use a base form with plural subjects. D.Add

64. science

A transformer has 3,000 loops in its primary coil and 1,500 loops in its secondary coil. What is the voltage in the secondary coil if the voltage in the primary coil is 120 V?

65. science

If a projectile is fired straight up at a speed of 13m/s. How long does it take to reach the top of its motion? If the acceleration due to gravity is 9.8m/ s motion (squared) answer in units of s

66. physics

1.Give examples of a one-dimensional motion where (a) the particle moving along positive x-direction comes to rest periodically and moves forward. (b) the particle moving along positive x-direction comes to rest periodically and moves backward. 2.Give

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67. Elementary Statistics

Compare the 95% and 99% confidence intervals for the hours of sleep a student gets. Explain the difference between these intervals and why this difference occurs.

68. chem

calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.

69. Chemistry

Calculate the equilibrium constant at 300 K for the reaction HgO(s) ↽⇀ Hg(ℓ) + 1/2O2(g), given the data delta S delta h  kJ J/K mol mol  HgO(s) 70.29 −90.83 Hg(ℓ) 76.02 0 O2(g) 205.14 0

70. SOCIAL STUDIES 9

I really need help on this question so please help me. Make an organizer to compare government under a republic (the commonwealth), an abcolute monarchy, and a constitutional monarchy. Use the following headings: the ruler, the role of law, and the rights

71. medical

Mr johnson is admitted to the hospital with chest and epigastic pain. he is evaluated by er department doctor with a diagnosis of rule out myocardial infraction. mr johnson is then transferred to a larger facility for further workup.... What is the

72. math

the question is a stock gained 2 7/8 points, lost 1 3/4 points and then gained 1/2 point and then lost 5 points. What was the total change in the stock price? I got a loss of = -3 3/8 is this correct

73. Math

Sum of4th and the 6th terms of an a,p is 42 . While the sum of the 3rd and 9th terms of the same a.p is 52. Find the (a) first term (b)common difference (c) sum of the first ten terms of the progression. Solution

74. Physics

Two forces are the only forces acting on a 7.8 kg object which moves with an accelera- tion of 4.5 m/s2 in the positive y direction. One of the forces acts in the positive x direc- tion and has a magnitude of 14 N. What is the magnitude of the other force

75. social studies 9

Make an organizer to compare government under a republic (the commonwealth), an abcolute monarchy, and a constitutional monarchy. Use the following headings: the ruler, the role of law, and the rights of people.

76. Chemistry

Which property of gases best explains the ability of air bags to cushion the force of impact during a car accident?K

Which of the following shound be capitalized? a. river b railroad c drive d weather?

78. homework math

For every 20 cakes ordered from Barry's Bakery, 8 cakes ordered are chocolate. Which proportion can be used to determine x, the total number of cakes ordered from the bakery when 30 chocolate cakes have been ordered? A. 8/12 = x/30 B. 8/20 = x/30 C. x/8 =

79. Social Studies 8R - help!!!!!!

I need the definition for the following words: Sacramento vein national grange Roundups Treaty of Guadalupe Hidalgo Fort Laramie Treaty 1851 Battle of Little Bighorn I tried looking in my book, it's not there and Google it. I having a hard time finding the

80. Check my precalc

Find the verticle, horizontal, and oblique asymtopes if any. #1 (x^2 +6x+5)/2x^2 +7x+5 y= (1/2) and x= -5/2 and -1 #2 (8x^2 +26x-7)/4x-1 y=2x+7 and x=1/4 #3. (x^4-16)/(x^2-2x) x= 0 and 2 y= x^2 +2x+4 thanks!

81. physics

A pelican ﬂying along a horizontal path drops a ﬁsh from a height of 3.1 m. The ﬁ!@#\$%^&ravels 6.6 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of

82. Physics

A coil of 5 ohms resistance is connected to a battery whose E.M.F. is 6 volts. What current flows in the coil?

83. Physics

A 0.230 kg block on a vertical spring with spring constant of 4.25e3 N/m is pushed downward, compressing the spring 0.048 m. When released, the block leaves the spring and travels upward vertically. How high does it rise above the point of release?

84. Algebra 2

x+2y+5z=-1 2x-y+z=z 3x+4y-4z=14 solve the system using linear combination method.

85. math

Find the accumulated amount A if the principal P = \$3,000 is invested at the interest rate of r = 9% per year for t = 5 years, compounded annually. Please round your answer to the nearest cent.

86. physics

a person standing on a moving escalator is moving relative to another person standing on the escalator true or false?

87. Math

Suppose P( A given B)= .6, P(at least one of the two events occurs)= .8, and P(exactly one of the two events occurs)=.6. Then P(A) is equal to? The answer is 2/3. Could someone please explain how to get it. Thanks so much!

88. chemistry

what is the shape of a molecule if the central atom has two bonded atoms and two lone pairs

89. Physics

A motor cycle starts from rest and reaches a speed of 6m/s after travelling with uniform acceleration for 3s. What is his acceleration?

90. Statistics

You have a population that has a mean of 100 and a standard deviation of 15. You randomly draw 100 people out of this population and record the mean score. You repeat the process a large number of times recording the mean score for each sample you draw.

91. physics

An autographed baseball rolls oﬀ of a 0.59 m high desk and strikes the ﬂoor 0.42 m away from the desk. How fast was it rolling on the desk before it fell oﬀ? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s

92. last question

a dog toy is on sale for 20% off the orginal price. if the orginal price of the toy is \$3.80 what is the discounted price? i got \$3.04

93. chemistry

what happens in a condensation polymerization reaction?

94. Physics

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 97.0 kg. The mass of the rock is 0.320 kg. Initially the wagon is rolling forward at a

95. Macroeconomics

The annual nominal rate of interest on a bank certificate of deposit is 12%. What would be the effect of an inflation rate of 13% and why?

96. Biology!!!!!

7)State whether the following sentences are true or false. Rewrite them if they are false. a) Every chemical reaction taking place in cells is regulated by a specific enzyme. b) Enzymes work inside cells only. c) Enzymes are carbohydates d) An active site

97. Chemistry/Quantitive Anaylsis

Before determining the amount of sodium carbonate in a sample by titration with standard hydrochloric avid the anaylst decide to check the procedure by analyzing a known sample of 98.75 (w/w)% purity. Five replicate determinations of the known gave the

98. Physics

A 6 g bullet leaves the muzzle of a rifle with a speed of 333.3 m/s. What constant force is exerted on the bullet while it is traveling down the 0.9 m length of the barrel of the rifle? Answer in units of N

99. physics

1.In one dimensional motion, instantaneous speed v satisfies 0 ≤ v < v0. (a) The displacement in time T must always take non-negative values. (b) The displacement x in time T satisfies – vo T < x < vo T. (c) The acceleration is always a non-negative

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100. Physics

After a day of testing race cars, you decide to take your own 1502.5 kg car onto the test track. While moving down the track at 11.4 m/s, you suddenly accelerate to 30.2 m/s in 19.2 s. What average net force have you applied to the car during that time?

101. Geometry

The Great Pryamid of Cheops has a square base of 771ft. on a side and a height of 4186ft. How many rooms 35ft x 20ft x 8ft would be needed to have a volume equivalent to that of the Great Pryamid?

102. science

jay heated 120mL of water that was 20 degrees celsius to 80 degrees celsius. a)how much did the temperature of water change? b) how much heat did jay add to the water? c) if jay used a liquid that was not water, the specific heat would not equal:(circle

103. Physics

Which of the following statements about projectile motion is not correct? a)The acceleration is constant and in one direction. b)The only force is gravity. c)In projectile motion, the motion can be broken down into perpendicular components that are

104. Science

How would you prepare 10 mL of 0.08 M NaCl in sodium acetate buffer? (Stock Sodium acetate buffer: 0.1 M)

105. Math

Rusell finished 6 out of 10 homework questions. which fraction shows how much of the homework he finished?

106. Algebra

Marie is 13years older than Joann. The sum of their ages is 55. How old is Joann?

107. Math

Graph the function. g(x)={x+2, x less than or equal to -3 1/2x-2, x>-3

108. english

1. On Christmas, children usually get gifts from their parents. 2. At Christmas, children usually get gifts from their parents. 3. On Christmas day, children usually get gifts from their parents. 4. For Christmas, children usually get gifts from their

109. chemistry

A 2.622 g sample of almond is ignited and used to melt ice in a can. a. if the almond sample melted 15.24g of ice,What is the heat produced in kcal/gram? b. If the heat from the almond sample was used to heat 100.0 mL of water at 0.0 degree centigrade.What

110. English ms. sue

ms. sue for the book catcher in the rye i am being ackley describing holden, and i choose the 2nd incident when holden goes to ackleys room that one night after getting socked from stradlater. i not know what be a good title for this creative writing

111. Physics

Consider the collisions between a car and a truck whose weight is much heavier than the car (M ≫ m). Friction is so small that it can be ignored. If they are both moving at the same speed when they collide, what best describes the size (or magnitude) of

112. algebra

What is the equation to the word problem? Currently, you have \$60 & your sister has \$135. You decide to save \$5 of your allowance each week,while your sister decides to spend her whole allowance plus \$10 each week. How long will it be before you have as

113. physics

At the surface of a certain planet, the gravitational acceleration has a magnitude of 15.0 . A 28.0- brass ball is transported to this planetWhat is the mass of the brass ball on the Earth and on the planet

114. social studies

GIFT OF THE NILE 1. What would be the main mineral resource in lower Egypt?

115. chemistry

A 2.622 g sample of almond is ignited and used to melt ice in a can. a. if the almond sample melted 15.24g of ice,What is the heat produced in kcal/gram?

116. ALGebra

Can you check 2x + 3 (x-2) -3 (x-6) I got 2x+3x-6 -3x+18 2x+3x-3x= 2x -6+18 =12 Final answer : 2x+ 12

117. english/essay writing help

Hello! So Im having trouble with my thesis statement for an essay. My teacher gave us three questions to answer and make the answers into a thesis statement. heres the questions and instructions: Does defining human worth based on shallow measurements,

118. math

find the permutations one person select 4 books, 2 cds, 1 dvd from 10 books, 20 cds, and 5 dvd

119. Physics

You are riding on a jet ski directed at an angle upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 8.9 m/s at an angle of 26.0° upstream, what is the speed of the jet ski relative to the water? (Note: Angles

120. Behavioral Statistics

You have a population that has a mean of 100 and a standard deviation of 15. You randomly draw 100 people out of this population and record the mean score. You repeat the process a large number of times recording the mean score for each sample you draw.

121. Math. test tomorrow. help!

In 1960, the population was 291000. In 1970, the population was 480000. Assuming exponential growth, what is the annual percent rate? and doubling time? The answers are 5.13% and 14 years. I do not know how to get this though :( Please help!

122. Q E R BY UNI OPL GHR

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123. math

I make A snack mix by combining 3/4 of a pound of gummy bears with one pound of peanuts. I have 3 1/4 pounds of peanuts a) how many pounds of gummy bears do I need to make the snack mix? b) how many pounds of snack mix can I make? My answers are: I have a)

124. chemistry

the level of water in a graduated cylinder is 52.7 ml. After a solid object weighing 100 g is added, the level is 87.4 ml. What is the density of this object?

125. Chemistry

I need to find the average molar mass of an unknown element. The atomic mass is 120; the mass numbers of isotopes are 295, 296, 297, 298 and 299; the percent of each isotope is 2.356%, 4.325%, 15.652%, 48.452% and 29.215%. The mass of the neutron is

126. Physics

Block A and Block B in the figure below are connected by a string of negligible mass. There is a force on A with a magnitude of FA=20N and a force on B with a magnitude FB=34N in the directions shown in the figure. What is the tension in the string?

127. Algebra

Use the Rational Zero Theorum and Descartes Rule of Signs as an aid in obtaining the first root.

128. Math

when testing for a fever, what is the true positive rate for a thermometer that always reads 105 F? What is the false positive rate? **Note: the definition of fever is that the patients temperature exceeds 100 F**

129. Chemistry/Quantitive Anaylsis

Determine the absolute and percent relative uncertainty expressing the result in the correct number of significant digits a.) 6.2 (+-0.2)-4.1(+-0.1) b.)[9.23(+-0.03)][4.21(+-0.20}/21.1(+-0.2) c.)log[3.1415(+-0.001)] d) log[(0.104(+-0.0060)]^1/2

130. enviromental

Completely mixed flow ractor CSTR and plug flow reactor (PFR) may have significantly different efficiencies depending on the reaction order. This problem asks you to compare the relative reactor sizes required to ensure 99.0 % removal of wastewatwer

131. english

We left King ranch on a december day in 1873. On the Santa Fe trail, we hit bad weather. The Red river was flooded and it took us four days to get the Cattle across. All in all, it was a hard trail drive, but we got our Longhorns to the railroad at

132. CHEMISTRY

HOW MANY GRAMS OF CA ARE REQUIRED IF I HAVE 12.9 GRAMS OF OXYGEN TO FORM CAO

133. English

In the book, "The Memory Keeper's Daughter" by Kim Edwards, after Norah has successfully destroyed the wasps' nest, Edwards writes that there was something happening in Norah's life, "an explosion, some way in which life could never be the same" (p. 139).

134. Math Figure Logic

ACROSS 1. Forty more than 24- Down ~ Nine more than 3-Down Two less than I-Down 7q to ;;l = '" 7. Five times 14-Down 8. 3-Across times 16-Across .~ Four less than 22-Down 11. Two hundred less than 28-Across 13. Same digit repeated 16. Consecutive digits in

135. English

My prompt is: Explain, in an essay with a thesis, why student papers must be relevant and how that relevance is achieved in their writing. (The requirements of this essay include why and how. Address both in the thesis) I'm pretty sure I need to address

136. Physics

Four forces act on a hot-air balloon, shown from the side in the figure below. Find the magnitude and direction of the resultant force on the balloon if F1 = 5050 N, F2 = 1450 N, F3 = 950 N, and F4 = 4200 N. ______N at ______ ° clockwise from F2

137. economics

Prepare a two- to three-page analysis by answering the questions below. Be sure to cite your references using APA format. What is nominal GDP? What is real GDP? What is included in each? Why are these measures important? What do they tell us? What was GDP

138. grammar

Identify which of the two sentences below contains a verb agreement error. Then, explain how to correct the problem. a. Among the guests was a private detective. b. Neither of those mattresses feel comfortable

139. grammar

Explain what is wrong with the following sentence and make any corrections if necessary: “Neither the mouse nor the rats could find its way through the maze

140. grammar

Explain what is wrong with the following sentence and revise as needed to correct the problem: “I saw mountains of uncollected trash walking along the city streets.”

141. Physics

I'm having problems setting up an equation to solve for time t in a projectile motion problem. What is given is horizontal position, accerlation due to gravity, the initial speed with, the angle, and the vertical position related to speed. I'm suppose to

142. Algebra 1

What is one divided by z to the power of three simplified?

143. science

It says; the temperature of 50g of water was raised from 5 degrees celsius to 85 degrees celsius. then it asks me: what amount or mass of water was heated? how do i find that out?

144. algebra

X-5/3 =1 Or X - 5 = 1 ______ 3 I'm trying to type and tell you it's x-5 over 3 equals 1 I don't know how to do I think I have to do reverse operation which is multiply

145. Physics

Aiyana drives for 100 s at a rate of 20m/s, then turns around and drives for another 200 s at a rate of 30m/s and completes the rest of her journey at a rate of 90m/s for 100 s. what is her average velocity?

146. physics

a 15.0 kg mass and a 2.00 kg mass are connected bya string that passes over a frictionless pulley, the 15.0 kg mass lies on a smooth inclined at 45.0 solve for the acceleration of the masses and the tension in the string

147. Algebra inequality

I have to choose a variable and write inequality For less than or equal to I'm using these keys

148. math hw

in 1997 there were 3344 amusement parks in the u.s.. this decreased by 148 in 2002 then grew by 47 by 2008 how many amusement parks and arcades were there in 2008? please show work

149. physics

A car traveling in a straight line has a velocity of +3.3 m/s. After an acceleration of 0.71 m/s2, the car's velocity is +8.8 m/s. In what time interval did the acceleration occur?

150. Chemistry

A gas-phase reaction has Kp = 2.44 × 10 20 at 25 ◦ C. Calculate ∆G 0 for this reaction. Answer in units of kJ/mol rxn

151. math hw

in a recent year, 286 female deer were born in clark county. this is 93 fewer than the number of male deer born. how many male deer were born that year? show work

152. Logarithms

if log base 10 of 2 = .301 then what is log base of 10 of 2000? I know how to solve with a calculator but I'm having a hard time doing it without one.

153. social studies

when many native americans died from a disease called smallpox?

154. Sociololgy

What is the main difference between parametric and nonparametric statistics?

155. Algebra

Translate to a proportion and solve. Two cups of water are used for every 6 cups if flour when making paste. How many cups of flour are needed for 8 cups of water? Any type of help would be appreciated greatly. Thank you in advance.

156. psychology

Imagine that Rasmussen College has asked the psychology department to research the study habits of its students

157. chemistry

In a 100g sample of copper, 69 g were Cu-63 while 31g were Cu-65. Find the average atomic mass.

158. expression

the same same number of birds, b, sitting on three different wires, then 9 birds fly off

159. Political Science

What are the factors that keep an ideology alive? How does an ideology survive through decades? Is it because of the people, economic structure of a state or simply that once an ideological concept has been developed that it cannot truly disappear?

160. Computer Science

when testing for a fever, what is the true positive rate for a thermometer that always reads 105 F? What is the false positive rate? **Note: the definition of fever is that the patients temperature exceeds 100 F**

A proportion is shown below. 7/10 = 17.5/x What is the value of x?

162. College Chem

The density of the Earth is about 3.5g/cubic centimeters. If the Earth has a radius of 1.126 by 10 (to the seventh power) meters, what is its mass? (hint: volume= 4(pie)r(to the third power)/3; 1 meter=100 centimeters

163. Word problem math

Word problem. You cut a 2 m long board into 2 pieces . One piece is 10 cm shorter than the other. How long are each boards.? I got. 1 pc at 80!cm. the other 1pc at 100 cm Is this right ?

164. pre-cal

use the given zero to find the remaining zeros of the function. h(x)=x^4-12x^3+36x^2+68x-525 zero:4-3i

165. Languagge

what type of leaderships are in a community?

166. math

what is 2/5 od 550

167. algebra

what is the density of a billiard ball that has a volume of 100cm cubed and a mass of 250g?

168. statistics

given the 95% confidence interval (6.214, 7.686), interpret

169. math

which of the following is an example of a proportional relationship between x and y? A. y = 2 B. y = 3x C. 4y + 4x = 6 D. 4y - 2 = 2x - 4

170. english

What does the backdoor of Pichot’s symbolize for Grant? please write in paragraph form

171. Math

List the subsets of {P, N, D, Q}, where Q represents a quarter. How many subsets did you find?

172. precal

how do you find an exponent variable without logarithms? ex. 8.2=1.65(0.8)^n-1 thanks

173. Physics

a) You have two forces, 105.5 N and 61.5 N. What is the magnitude of their resultant if the first acts upward and the second acts downward? Answer in units of N. b) What is the direction of the resultant? c) What is the magnitude of their resultant if they

174. grammar

If you wish to (commend,command) learn to away

175. Microeconomics

For this part of the assignment, we will focus on the demand curve. Draw the demand curve for the A-Phone. Explain how the graph, price, and quantity demanded will change if the following occurs: • There is an overall increase in income. • It is

176. Physics

A block rests on a frictionless surface. Find its instantaneous acceleration when the spring on the left is compressed 4.48 cm while the spring on the right is stretched 10.3 cm. Each spring has a force constant of 1.05 103 N/m.

177. English

Okay we are doing work from the texas write source skills book pages 61-70. The directions say: write the correct word for each word in parentheses that is used incorrectly. This is it: I will Number them . Please tell me if any are wrong. Thank you!

178. math

what is the trem for 3,500*1,500 the value

179. Algebra. .

Can you check 2/3 k = 60 I got:: 3 2 k = 60 * 3 = 90 ________________ 2 3 1 2 = 2 K = 90/2 K = 45

180. math homework

Melinda bought two new rugs for her bathroom. The bigger one is 12 inches tall and 20 inches wide, the smaller one is 6 inches tall and 14 inches wide. Which of the following statements is true? A.The rugs are not proportional because 20 x 12 does not

181. Algebra pls check

Is this right ? -2(w-30) =-6w -2w -60 = -6 w +2w =+2w -60 = -4w _____________ -4 = -4 15 = w

182. Math

ÚABC ~= ÚACB BD perpendicular AC The sum fo the three angles in any triangle is 180 degree. Prove: mÚCBD = 1/2 mÚBAC

183. english

which sentance contains an incorrect plural? A.The parties ended around midnight. B. If wishes were horses, beggars would ride. C.We spotted the foxs late in afternoon. D.I hate traffic delays.

184. english

In this sentence, what is the antecedent of the pronoun it? A. her B. Carla C.house D.work?

185. chemistry

how would you separate a mixture of NaCl, Fe pellets and water

186. arithmetic

I am greater than 200 but less than 500. The sum of my digits is 18. the product of my tens place digit and my 100's place digit equal 20. What digit am I ???

187. algebra

5A=5-b 5A=3-b

188. math

a 4 m by 3 m rectangular floor is covered by 300 square floor tiles. What is the side length of each tile?

189. genetics

What kinds of amino acids on histone tails are able to be phosphorylated and why?

190. math/linear

4x + 5 = 2x + 19.. need to break down into coins and pouches. Need to know how many coins in each pouch.

191. algebra

X-5/3 =1 Or X - 5 = 1 ______ 3 I'm trying to type and tell you it's x-5 over 3 equals 1 I don't know how to do I think I have to do reverse operation which is multiply

192. Spanish

I need to put these words into sentences using correct verbsto answer the question below. “Qué estás haciendo?” cepillarse los dientes, maquillarse, bañarse, sacar la basura, acostarse, ponerse nervioso/a

193. science

sally had 20g of water and it started at a temperature of 26 degrees celsius and sally cooled it to 22 degrees celsius. a)how much did the temperature of water change? (show work) B) how many calories did sally's water lose?

194. Math

x^4-4x^3+3x^2+8x-16 Find the zeroes given one is x^2-x-4. I don't know what to do now. i tried synthetic division. pls help : D

195. Precalculus

x^4-4x^3+3x^2+8x-16 Find the zeroes given one is x^2-x-4. I don't know what to do now. i tried synthetic division. pls help : D

5=15-24a/6

5=15-24a/6

198. chemistry

how would you separate a mixture of NaCl, Fe pellets and water

199. chemistry ................chemistry

what is the color a mixture of sodium and potassium compounds?? What is the color a mixture of sodium and potassium compounds (use the cobalt glass)??

200. math

I make A snack mix by combining 3/4 of a pound of gummy bears with one pound of peanuts. I have 3 1/4 pounds of peanuts a) how many pounds of gummy bears do I need to make the snack mix? b) how many pounds of snack mix can I make? I have a) 2 1/2 pounds of

201. Math

x^4-4x^3+3x^2+8x-16 Find the zeroes given one is x^2-x-4. I don't know what to do now. i tried synthetic division. pls help : D

202. health

6. There are three major health care concerns: access, cost and quality. Is it possible to correct all three problems simultaneously?

203. Math

Could someone help be understand the general addition rule for probability? It says P(A or B)= P(A)+P(B) - P(A and B). But I get a different answer when I work it out myself: P(A or B)= P(A)(1-P(B)) +P(B)(1-P(A)) = P(A) -P(A)P(B) +P(B)-P(A)P(B) =P(A) +P(B)

204. writing thesis statment

how to create a thesis statment for a limited subject my mother and the general subject is family

205. math hw

tickets to a baseball game cost \$25 each plus a \$4.50 handling charge per ticket. if sharon has a coupon for \$10 off and orders 4 tickets,how much will she be charged?

206. Chemistry

Does anyone know Whats the reaction time between KIO3 & HSO3 at 50degrees C. Folks how can I find this out with a graph of time[y axis] v/s temp [x/axis]. Appreciate your insight

207. math

write the following number in standard, written, and expanded notation 44.4 million

208. physics

A car company states that their car can accelerate from rest to 70km/h in 7 seconds. What is the cars average acceleration?

209. Math. Increases

In 1960, the population was 291000. In 1970, the population was 480000. Assuming exponential growth, what is the annual percent rate? and doubling time? The answers are 5.13% and 14 years. I do not know how to get this though :( Please help!

210. Logarithms

Using the approximation log10^2=0.301, find: log10^8

211. physics

An automobile with an initial speed of 6.60 m/s accelerates uniformly at the rate of 3.9 m/s^2 Find the final speed of the car after 5.2s Answer in units of m/s

212. Science/chemistry

Is PO3 a mixture or compound. Is MgCl a mixture or compound. Thanks

213. Math. easy?

On his 13th birthday he was 112cm tall and on his 14th birthday he was 121cm tall. Assume a geometric monthly growth rate. What is this rate? I just need to know how to set it up. Please and thanks

214. chemistry

What is the formula for barium chloride

215. Maths

7y = 49w - 35 I am not sure how the working out goes

216. Math

Which of these two are the longest measure: Inch or Decimeter?

217. Biomechanics

If the volume of a material is conserved under loading (Volume without force = Volume with force) what is the material’s Poisson’s ratio? You can assume that the material is isotropic (it will behave the same in every direction). Hint: take a cube and

218. Math

1)let k and w be two consecutive integers such that k

219. physics

If the pelican was traveling at the same speed but was only 2.3 m above the water, how far would the ﬁ!@#\$%^&ravel horizontally before hitting the water below? Answer in units of m

220. physics

An automobile with an initial speed of 6.60 m/s accelerates uniformly at the rate of 3.9 m/s^2 Find the final speed of the car after 5.2s Answer in units of m/s

221. social studies

a real man does not do house work?

222. Science

Which of the following is not an example of a soft-path solution? a) Community-operated ditches b) Micro-sprinkler systems c) New cross-country pipelines d) Protecting a pond’s ecosystem I believe that the answer is...a

what the rule for 58,-2

224. math

why isnt anybody answering my questiions? do u have to have an account or something? if you do just tell me and ill get one!!!1 because everybody else has an answer! you should at least tell me that i need an account if i do!

225. physics

What is the average velocity in the following cases? You run 77.9 m West at 2.67 m/s then walk for 133 s at 8.78 m/s West.

226. physics

What is the average velocity in the following cases? You run 77.9 m West at 2.67 m/s then walk for 133 s at 8.78 m/s West.

227. computers

Which graphical input source acts like a copy machine but copies the image to the computer instead of paper?

228. college math

I'm trying to find why the linear function f(-x)=x√x^2+2 is negative when it should be neither. why are √'s not negatives?!?!?! Is it because √x can't cross over the y axis because √x can't be negative? Then why is it that the x on the outside of

229. Science

Make a spreadsheet to display how the total mass of a 500-kg elevator changes as 50-kg passengers are added one at a time.

230. Maths

I got the last question so please don't worry.. These are the ones I get confused with. 7y +21 x - 15 = 4y- 12 + 13 I need to see the numberical working out asap if someone would be so kind .. thanks P

jeremiah want to construct a diagram of his dream house.he decides that he wants the area of the house to be 9600 square meters.in designing the house jeremiah decides that he wants the length of the house to be 1.5 times the width of the house

232. chemistry

A radio broadcasts at 101.3 Megahertz. What is the wavelength of the signal in meters?