1. chemistry

a) Calculate the percent ionization of 0.125M lactic acid (Ka=1.4x10^-4) b) Calculate the percent ionization of 0.125M lactic acid in a solution containing 0.00075 M sodium lactate.

2. percentages

Say an advertiser makes \$0.10 every time someone clicks on their ad. Only 20% of people who visit the site click on their ad. How many people need to visit the site for the advertiser to make \$20?

3. physics

A string is wrapped around a uniform disk of mass M = 1.6 kg and radius R = 0.10 m. (Recall that the moment of inertia of a uniform disk is (1/2)MR2.) Attached to the disk are four low-mass rods of radius b = 0.17 m, each with a small mass m = 0.6 kg at

4. greatbay community college

A 5.00 kg stone is thrown upward at 7.50 m/s at an angle of 51.0 degrees above the horizontal from the upper edge of a cliff, and it hits the ground 1.50 s later with no air drag. Find the magnitude of its velocity vector just as it reaches the ground.

5. science

forces of 20N to the south,40N to the northeast, and 10N to be east act on the object.the magnitude of resultant force is a)10N b)39 N c)20 N d)46 N

6. life science

1.why are fossils important discoveries? 2. Why are fossils kept in a glass box in the museum? 3.What feature does australopithecus sediba share with humans? 4.What feature does australopithecus sediba share with apes? 5.Explain the scientific

7. Life sciences

Why are the fossils kept in a glass box in the museum?

8. science

a mixture of gases contains 64g of methane, 64g of oxygen and 64g of sulphur dioxide. The pressure of the mixture is 210 kpa. what is the partial pressure (in kpa) of the methane expected to be?

9. Science/Physics

Andee has a mass of 68.5 kg on earth. What is his weight on Earth? What should his mass be in order to have the same weight at the surface of the moon?

10. Geometry

OPQRSTUVWX is a regular decagon. A rotation of A degrees about U maps X to R. Given A < 180 degrees, find A. Thought it was 144 but it isn't.

1) Write the translation that maps P(-4, 2) onto the point P ' (-1, -1)? 2) What are the coordinates of the reflection of the point (5,1) over the line y = x? 3) The coordinate notation for reflection over the y-axis is -?-. 4) If a translation has a

12. Ecology

Aside from lead, the two air pollutants most hazardous to human health are: A. sulfur dioxide and carbon monoxide. B. ozone and sulfur dioxide. C. ozone and fine airborne particulates. D. nitrous oxides and carbon monoxide. is it A

13. Math

There are some rabbits and chickens in a farm. Together they have 35 heads and 94 feet. How many rabbits? How many chickens?

14. Physics

Two trains, one starting in Calgary and the other in Edmonton, travel toward one another. The Edmonton train travels at 120 km/h toward Calgary, while the Calgary train travels at 140 km/h toward Edmonton. If the trains begin at the same time and Edmonton

15. life orientation

ways 2 address xenophobia in the community or southa africa or globally

16. developmental appropriate curriculum

Which of the following strategies is best for teaching motor skills? A. Suppressing motor skills that may be developing early B. Telling children to try harder C. Coaching and demonstration D. Experimentation and strict correction

17. Translations

Point Q is the image of point P under a dilation with center O and scale factor 4. If PQ = 18, then what is OP?

18. physics

Calculate the energy required to vapourise 50g of water Initially at 80¡ãC if the specific heat capacity of water is 4.2 J/g.k. (specific latent heat of vapourisation of water is 2260 J/g)

19. AP Calc

The picture to the right shows the Ben Franklin Bridge which stretches across the Delaware River joining Pennsylvania and New Jersey. The center span of the bridge is about 4200 feet long. The suspension cables hang in parabolic arcs from towers 750 feet

20. Geometry

Write the translation that maps P(-4, 2) onto the point P ' (-1, -1)? What are the coordinates of the reflection of the point (5,1) over the line y = x? The coordinate notation for reflection over the y-axis is -?-. If a translation has a coordinate

21. physics

A male cheerleader does 2.25 kJ of work in lifting a 57.5 kg cheerleader 1.25 m off the ground during the half time show. The energy gained by the lifted cheerleader is __________ kJ.

22. AP Calc

When a chain hangs under its own weight, its shape is catenary. The equation of a catenary with a vertex on the y-axis is y=e^x+e^-x. Find the length of the chain from x=-2 to x=2. Then use the same technique from Problem #8(Previous AP calc problem I

Lane French had a bad credit rating and went to a local cash center. He took out a \$100.00 loan payable in two weeks at \$105.50. What is the percent of interest paid on this loan?

24. Chemistry

Calculate PH of 0.05 M solution of ammonium acetate

25. math

A specially made pair of dice has only one- and two-spots on the faces. One of the dice has three faces with one-spot and three faces with two-spot. The other die has two faces with one-spot and four faces with a two-spot. One of the dice is selected at

26. math

6. Joe played golf with Sam on a speacial par 3 course.. They played nine holes. The expected number of strokes on hole was 3. A birdie is 1 below par. On nine holes Frank made par on 1 hole, got 2 birdies, one eagle, four bogies and one double bogie. How

27. prealgebra

A building lot in a city is shaped as a 30° -60° -90° triangle. The side opposite the 30° angle measures 41 feet. a. Find the length of the side of the lot opposite the 60° angle. b.Find the length of the hypotenuse of the triangular lot. c. Find the

28. physics

Written in scientific notation, with three significant digits, the number 0.01050 is_______?______ x 10?

29. Math

After Michael 110 baseball cards to Sally and 75 to Heidi, he still has 315 left. What percent of his cards did Michael give away? 110 + 75... and then??

30. strayer university

P5. The following information is available to you: travelers’ checks _ \$1 million; coin and paper currency _ \$30 million; repurchase agreements and Eurodollars _ \$15 million; demand deposits _\$25 million; retail money market mutual funds _ \$60 million;

31. math

a bowl of fruit has 3 strawberries, 2 banannas and 1 apple. what fraction of the fruit is banannas?

32. physics

A solid of mass 1kg suspended by a string is completely immersed in water. If the tension in the string is 5N, calculate the upthrust on the solid. (take g = 9.78m/s)

33. statistics

The following list is a sampling of the costs of various statistics textbooks used at several colleges. Give the upper confidence limit for a 95% confidence interval estimate for the mean cost of all statistics textbooks. 109.95; 92.00; 96.70; 84.85;

34. Math

A particle moves with a velocity of v(t)=3cos(2t) m/s along an axis. Find the distance traveled by the particle over the time interval 0 is less than or equal to "t", which is less than or equal to (pi/8)

35. physics

A sprinter has a mass of 82.0 kg. If the sprinter is running at a speed of 22.5 km/h, determine his kinetic energy. __________ × 103 J.

36. physics

A girl lifts her 20-kg knapsack a vertical distance of 0.70 m and then she carries it 2510 m across the park to the water fountain. The value of the work done by the girl is __________ J.

37. physics

A 45.0 g golf ball is released 2.50 m above the ground. The velocity of the golf ball when it hits the ground is

38. math

1. A submarine was suituated 800 feet below sea level. If it ascends 250 feet, what is it new position 2. Metal mercury at room temperature is a liquid. Its melting point is -39°C. The freezing point of alcohol is-114°C. How much warmer is the melting

39. trigonometry

An object is attached by a string to the end of a spring. When the weight is released it starts oscillating vertically in a periodic way that can be modeled by a trigonometric function. The object's average height is −20 cm (measured from the top of the

40. Ecology

According to the article "The Grim Payback of Greed" our level of consumerism: A. is essentially a creation of the 20th century. B. has declined in the West but is growing rapidly in developing countries. C. is highly correlated with reported levels of

41. physics

A snail moved 0.14 m between two cabbages in 3.0 minutes. The average speed of the snail is

42. maths

16. A pole of length 10 m casts a shadow 2 m long on the ground. At the same time a tower casts a shadow of length 50 m on the ground, then find the height of the tower.

43. Health

Below are descriptions about the programs that are designed to help prevent suicide. Which statement is true? A. CBT because it teaches the skills needed to deal better with upsetting situations. B. DBT, sometimes called collaborative care management, uses

44. physics

Jill runs 100 m in 15.0 s. Jon speedwalks 100 m in 30.0 s. If Jill and Jon have the same mass, then Jill's kinetic energy would be

45. physics

A hockey player lifts a 600 g trophy up into the air a distance of 75.0 cm. The work done against gravity on the trophy is __________ J.

46. Calculus

use the simpson's rule with n=10 to estimate arc length of y=x^(-1/3), for 1

47. Maths

An 8-sided die shows the numbers 1 to 8. A 6-sided die shows the numbers 1 to 6. If both dice are rolled at the same time, how many possible outcomes are there?

48. math(precalculus)

Write the equation of a Rational Function satisfying given conditions. Has vertical asymptotes located at x-2 and x=-1 Has a horizontal asymptote located at y=0(x-axis) y-intercept:(0,2) x-intercept (4,0) R(x)= ??? what I did is, R(x)= ax+b/c(x-2)(x+1)

49. Logic

Eric is planning a 7-day resort vacation. He will play golf on four mornings. He also wants to play tennis but can only play tennis on days he does not play croquet. He will play croquet on any day immediately following a day that he plays golf. What is

50. Political Issue

Select a professional organization in the nursing industry. Researching a current political issue addressed through the organization.

51. physics

A bus traveled 10.0 km from the north end of the city to the south in 10.0 minutes. The average speed of the bus was

52. physics

If you travel 10 m [E], 25 m [S], 12 m [W] and 25 m [N], your displacement is

53. physics

A car which is traveling at a velocity of 9.6 m/s undergoes an acceleration of 4.2 m/s2 over a distance of 450 m. How fast is it going after that acceleration?

54. math

find the sum of 3/6+4/10+3/30 and reduce to lowest term

55. Re-write this sentence

It is impossible that the allied powers should extend their political system to any portion of either continent without endangering our peace and happiness. This sentence gives a hint of a threat. I have to re-write the sentence and state the threat

56. Math

find the area of the region bounded by the function y=-x^2+5x-4 and the x-axis

57. maths

Zama had 140 packet of chips and each packet hada mass of 50g what is the mass of all packet of chips together ? Write your answer in kg.find the answer using cross multiply

58. physics

How would I figure out the answer to this question? A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from

59. physics

light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above Would the

60. English

What is an example of a moral fairy tale in the book "Great Expectations" by Charles Dickens?

61. physics

In a panic-stop, a car's brakes produced an acceleration of -8.0 m/s2 (or a deceleration of 8.0 m/s2). If you are traveling at 35 m/s, your speed after braking for 3.0 s will be

62. physics

An athlete prepares for practice by walking 820 m in 10.3 min and sprinting 600 m in 3.8 min. Determine the athlete's average speed in metres per second.

63. physics

The time required for a car to reach 28.5 m/s from rest, accelerating at 3.70 m/s2 is __________ .

64. current political issue

Explain how nurse leaders can use professional organizations to stay aware of political actions in the nursing and health care industry and the importance of doing so

65. physics

A 31.4-kg diver free falls from the diving board and hits the water with a speed of 10.0 m/s. Based on this information, the height of the tower is __________

66. physics

The useful energy output of an engine is 1.50 × 103 kJ and the total mechanical energy input is 4.32 x 103 kJ . The efficiency of the engine is __________%

67. Writing

How might one write a proposal with a sample script for a movie or TV program?

68. Calculus - Simpson's Rule and Arc Length

Can any show me step by step on how to get this? I keep on getting different answers... Thank You! Use Simpson's rule with n=10 to estimate the arc length of y=x^(-1/3), for 1

Would the answer be b)? diamond into air? A critical angle of 24.4 degrees applies to: a) light travelling from air into diamond b) light travelling from diamond into air c) light travelling from water into diamond d) light travelling from diamond into

70. physics

At exactly the critical angle: a) all light reflects back into the n1 medium b) all light reflects back into the n2 medium c) part of the light reflects back into the n1 medium, the remainder travels along the boundary between the two mediums d) part of

71. Calculus

Determine whether Ax = lnx/(sqrt x) is convergent

72. science

The mass of an object is 217.5g and its volume is 192mL. What is the density of the object?

73. statistics

Conduct a chi square analysis to determine whether sex and year in college are related. I have tried to submit the data but I can't seem to make the submission work. For my data I used 20 males and 20 females. and for the year in college I have 10

74. Chemistry

For :H2O(g) --> H(g) + OH(g); At 3000K and P(total)=1.00 atm, from your K value calculate system composition from 1.00 mol H2O(g) and no products initially. The K I got (using Delta G superscript zero = [Delta H superscript zero]-[T* Delta S superscript

75. algebra

In a given training week, a swimmer completes 1/4 mile on day one, 3/5 mile on day two, and 2/3 mile on day three. How many total miles does the athlete swim in the given week?

76. To Ms. Sue

Ms. Sue Hi! Im not sure if you will be able to help me with this one, since is Math homework, but this time is just to confirm if Im right the question is: What is 1,112,433 rounded to the nearest ten thousand? A. 1,120,000 B. 1,100,000 C. 1,110,000 D.

77. math

Kendra bought 4 paintings and wants to hang them side by side on a wall in her bedroom. However, only 3 of the paintings will fit side by side on this wall. How many different ways can Kendra arrange 3 of the 4 paintings on the wall?

78. Math

Of the books in a library, 1/3 came from Robbie's collection and 15 came from from Marta's. Of the rest 15 were Elena's, 1/5 were Winfield's, and 5 were purchased from the bookstore. How many books are there in the library?

79. physics

A 120.0 g object is moved from a shelf 2.9 m high to one that is 5.4 m high. The change in potential energy for the object is

80. physics

An elastic is stretched with an average force of 120.0 N a distance of 10.0 cm. The potential energy stored in the elastic is

81. physics

A hockey puck with a mass of 0.200 kg travels with a speed of 49.6 m/s during a slap shot. The puck's kinetic energy is

82. physics

Object A has mass m and velocity v. Object B has 18 times the mass and one third the velocity of object A. The kinetic energy of object B will be Spell check times the kinetic energy of object A.

83. physics

A machine loses 600 kJ as waste heat while producing 5,350 kJ of useful energy output. The efficiency of this machine is

84. physics

Initial sources of energy used to operate machines were __________ and __________.

85. Math

If the investment rises from \$1000 to \$5000, the percent is what from the original?

86. Math

9 is 1/3% of what number?? I need help

87. physics

An aircraft on its take-off run has a steady acceleration of 3.0 m/s2. It's velocity after 10 seconds will be

88. physics

When an object travelling at 12.7 m/s [E] speeds up to a velocity of 21.5 m/s [E] in 3.45 s, the magnitude of the acceleration is __________m/s2.

89. physics

A 130.0 g object is moved from a shelf 0.2 m high to one that is 5.0 m high. The change in potential energy for the object is __________ .

90. Math

9. If f is a linear function such that f(-1) = 5 and f(2) = -1, then f(x + 1) = A. -2x + 1 B. -2x + 3 C. x + 1 D. -2x + 2 E. 2x + 1