Trisha

Most popular questions and responses by Trisha
1. Chemistry

Element X has two natural isotopes:X-6 (6.015amu) and X-7 (7.016amu). calculate the atomic mass of element X given the abundance of X-7 is 92.5%. a)12.5amu b)6.50amu c)6.09amu d)6.52amu e)6.94amu

2. Physics

A shopper pushes a cart 40 m south down one aisle and then turns 90.0° west and moves 18 m. He then makes another 90.0° turn and moves 17 m What is the largest possible displacement of the shopper? couterclockwise west What is the smallest possible

3. Math Calculus

The number of portable CD players you are prepared to supply to a retail outlet every week is given by the formula: q = 0.1p2 + 2p where p is the price it offers you. The retail outlet is currently offering you \$50 per CD player. If the price it offers

4. world history

How did the french revolutionary army help to create modern nationalism?

5. maths

Cos square 30 degree cos square 45 degree + 4 sec square 60 degree + 1/2 cos square 90 degree - 2 tan square 60 degree

6. statics/physics

The uniform 10-kg ladder in the figure rests against the smooth wall at B, and the end A rests on the rough horizontal plane for which the coefficient of static friction is 0.3. determine the angle of inclination of the ladder and the normal reaction at b

7. Microeconomics

This is due Monday. I am not sure I am doing it correctly. Can someone help me out? Question: Assume that Jim is a rational customer who consumes only two goods, apples(A) and nuts(N). Assume also, that his marginal rate of substitution (MRS) of nuts for

8. Chemistry

A sample of benzoic acid contaminated with NaCl and sand is to be recrystallized: Benzoid Acid: Solubility in water at 100 degrees Celsius in g/100 mL = 6.8, at 0 degrees Celsius in g/100 mL = 0.2. NaCl: Solubility in water at 100 degrees Celsius in g/100

9. Chemistry

Which of the following processes is exothermic? a.rolling a ball up a hill b.boiling water in a beaker to make steam c.allowing meat to thaw after taking it out of the freezer d.reacting hydrogen and oxygen gases to make water e.a popsicle melting on a

10. Physics

I understand the basics of the center of mass, but I'm having a hard time with this wire one: "A uniform piece of wire, 20 cm long, is bent in the center to give it an L-shape. How far from the bend is the center of mass?" If you could help that'd be

11. math

In Triangle ABC, AC = BC and mC = 62°. The longest side of the triangle is: AC BC AB AM

12. Applied Calculus

A hardware store owner chooses to enclose an 800 square foot rectangular area in front of her store so that one of the sides of the store will be used as one of the four sides of the fence. If the two sides that come out from the store front cost \$3 per

13. Statistics

Suppose a college entrance exam has a mean of 1200 and a standard deviation of 100. An Ivy league college will only take applicants in the 90% percentile or higher. what is the lowest score they would need on the entrance exam?

14. Math

a 40 years old mother has a 10 years old daughter. In how many years will the mother be twice as her daughter? Please help me with this. ASAP. Thanks

15. science

a man loads 1,000 sacks of flour into a truck in 30.0 minutes. Each sack has a mass of 20.0kg and the man must lift each sack 1.00m from the cart up onto the truck bed. how much power did the man develop.

16. Rational Functions Word Problem

A car travels at a constant speed and burns g(x) litres of gas per kilometer, where x is the speed of the car in kilometers per hour and g(x) = 1280 + x^2/320x a) If gas costs \$1.29 per litre, find the cost function C(x) that expresses the cost of the fuel

17. Physics

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 20 m/s. The cliff is h = 53 m above the water's surface, as shown below. (a) How long does it take for the stone to fall to the water? (b) With what speed

18. Science

The terms diffusion and osmosis seem to have similar meanings. Explain how they are similar. Then give reason why scientists use two separate term.

19. Math

A ball is kicked into the air and follows a path described by h(t)=-4.9t^2 +8.4t+0.6, where t is the time in seconds and h is the height of the balls in metres. Determine the maximum height of the ball, to the nearest tenth of a metre.

20. math

The distance between -2 and 4 on the number line can be found by which expression?

21. Trig

Why is the arctan of - square root of 3 equal a negative value (-pi/3) While the Arccos of -1/2 equal a positive value (2 pi/3)? Since it's the same concept, I'm not sure why the one value is negative while the other is positive. Thanks for your

22. science

an object who's mass 5.20kg has a gravitational potential energy of 10.3kj. how high above the ground is the object?

23. physics

What is the kinetic energy of a 62kg cyclist if she is moving on her bicycle at 8.2 m/s?

I don't under stand ho to get the answer to this excel question can anyone help? and email me back skylerbloo at netscape . net The assignment is in three parts: 1. An analytic section that you will submit as an Excel spread sheet 2. A PowerPoint

25. physics

A square bar with a mass of 0.830 kg and 19.3cm long (l) rests on two parallel horizontal rails that are 18.0cm apart (d) and 120.0cm long (L) as shown in the figure. (By horizontal it is meant that the rails lie in a plane perpendicular to the local

26. PHYSICAL SCIENCE

WHAT IS THE KINETIC ENERGY OF A BALL WITH THE MASS OF 5KG ROLLING AT 10M/S

27. Language Arts

1. Which of the following is not part of the rising action in "Raymond's Run"? (1 point) A. Squeaky and Raymond confront Mary Louise and her friends on Broadway. B. Mr. Pearson hints to Squeaky that she should consider letting the new girl win. C. Squeaky

28. Physics

A hot-air balloon is descending at a rate of 1.7 m/s when a passenger drops a camera. If the camera is 44 m above the ground when it is dropped, how long does it take for the camera to reach the ground?

29. algebra

"Tanya's age is ten years greater than half Aarons age. If the sum of their ages is 55, how old is Tanya?" can who ever solves this explain how to do it too???

30. physics

At some instant the velocity components of an electron moving between two charged parallel plates are vx = 1.5 × 105 m/s and vy = 3.0 × 103 m/s. Suppose the electric field between the plates is given by In unit-vector notation, what are (a) the

31. physics

The magnetic field of the Earth is 0.50 x 10-4 T in a certain location. a) What will be in Newtons the force on a completely ionized carbon atom (Z = 6, A = 12) traveling with the solar wind with a velocity of 18.00 x 103 m/s perpendicular to the magnetic

32. Engineering

A box with an open top is to be made from a square piece of cardboard by cutting equal squares from the corners and turning up the sides. If the piece of cardboard measures 12 in on the side, find the size of the squares that must be cut out to yield the

33. science

an astronaut on a space walk bumps the shuttle and starts moving away at a velocity of 0.02m/s. The astronauts mass is 100kg. He has takesa 1kr "safety week" and shoves it away in exactly the direction of his motion at a speed of 6m/s. what speed does the

34. chemistry-Dr.Bob

ok for a lab we had to titrate a solution with KMnO4 and for each trial i got 22.83 mL,23.92, and 22.48 I need to find the mass percent of the oxalate ion. How would I do this? The equation is MnO4-+C2O4 2- -> Mn 2+ + CO2 In the lab we used about .1 g of

35. Math

A mall charges 25pesos for the first hour or a fraction of an hour as parking fee. An additional 25pesos is charged for every additional hour, or a fraction of an hour of parking. The parking area operates from 7A.M. to 12 midnight every day. a. Write a

36. Math

Sam is 9 years older than angel. Six years from now, Sam age will be thrice the age of angel 3 years ago. Find their present ages. Please help me with this. ASAP. Thanks

Express the infinite series below using sigma notation and then find the sum. 64 + 40 + 25 + 15.625... Any explanation would be excellent. Thank you so much.

38. physics

A man with a mass of 62 kg skis down a frictionless hill that is h = 3.3 m high. At the bottom of the hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20-kg backpack and skis off a 2.0-m-high ledge. At what horizontal

39. Financial Accounting

ane Doe of Creative Marketing was recording transactions into the accounting records to prepare financial statements for the bank in a loan application. Her expenses were higher than anticipated and she was concerned about the effects on net income. As she

40. physics

The eye of a hurricane passes over Grand Bahama Island. It is moving in a direction θ = 49° north of west with speed v1 = 41.0 km/h. Exactly three hours later, the course of the hurricane shifts due north, and its speed slows to v2 = 19.5 km/h, as shown

41. tessallations and polygons

Hi, I am a student teacher and I wanted to teach a grade 5 class a lesson on tessallations; however, I am not sure what group activity to incorporate into my lesson to help them better understand what tessallations are. For my motivation or focusing event,

42. Math

x=square footage of a house y=asking price in thousands of the house. x goes from 1200 square feet to 1500 square feet. the regression equation is y^= .0686x+83.24 A. what are the explanatory and response variables? B. Interpret the slope. C. Is it

43. physics

A rectangular loop with a=2.9 cm, and b=1.9 cm, moving with a velocity v=3.8 cm/s into an area where the magnetic field is uniform, pointing into the page, and whose magnitude is B= 450 mT. a) What is in volts the induced emf in the loop when the loop is

44. Science

Use the Particle Theory of matter to explain what viscosity in and why temperature affects viscosity.

45. Science

Help answer this riddle please-- It survives to this very day,it helped T-Rex capture prey. Thanks

46. chemistry-Dr.Bob

so is the balanced equation MnO4+C2O4->Mn +2CO2.. that doesnt make sense because there are 8 oxygens on the right side..

47. Econ

This is due Thursday. We are studying monopolies, and the question is; Firm X is a monoply firm. MR and MC for Firm X are as follow: MR=5,110-10Q, MC=10+10Q, where Q is output. a) Calculate Firm X's profit-maximizing output. I think this is Q=225 b) If

48. Help-Econ

Okay, this is due Tuesday. I'm woking on it but if anyone can help that would be great! Suppose firm A opeates in a perfectly competitive market. The price that currently prevails in the market is \$1,000. Firm A's marginal cost is 20Q, where Q is output.

49. Math

How do I prove that secθ - tanθsinθ = cosθ So far I have LS 1/cosθ - sinθ/cosθ (sinθ) =1/cosθ -sin^2/cosθ

50. English

I must write an essay based on the following question: compare the role of christy smith in helping Larry regain his memory in Somewhere in the night with the role of Margaret in helping Chris regain his memory in the return of the soldier. My thoughts are

51. Algebra

Twice a number increased by 28

52. University of Phoenix

How do I write a 150- to 200-word paragraph to explain the importance of purpose, audience, tone, and content in academic writing

53. Math

Write the equation of the line satisfying the given condition. Perpendicular to x = 4 and passing through the point (7, 2)

54. epimediology

a. A study of the relationship between exercise and heart attacks that is conducted among women who do not smoke. Explain whether gender is a confounder. b. A case-control study of the relationship between liver cirrhosis and alcohol use. In this study,

55. math

How would a congruence transformation affect the perimeter of a triangle.

I am creating a unit on public transportation in New York, but i am having a difficult time designing lessons to teach 3rd graders about public transportation. I was planning on giving the a word search, allowing them to explore various websites, and to

57. Algebra ll

Cleopatra was needed barge workers, and when the word went out 175 workers showed up, that is 21/2 times the amount needed. How many workers were originally needed? (I am trying to help my niece with her homework, and we live 600 miles apart. Can you

58. Physics

When an 8-lb rifle is fired, the 0.02-lb bullet receives an acceleration of 10^5 ft/s^2 while it is the barrel? (a) How much force acts on the bullet? (b) Does any force act on the rifle? If so, how much and in what direction? (c) The bullet is accelerated

59. St. Isaac Jogues Catholic School

The ratio of cats to dogs at a pet show is 1:3,what percent of the pets at the show are cats?

60. French

Verbes: avoir et être Mets les phrases suivantes au passé composé. 1. Nous avons faim. 2. Il y a un visiteur dans la classe 3. As-tu de la chance?

61. physical science

A person has a mass of 50.0 kg. what is the pressure they exert on the blades of their ice skates if each skate blade is 15.0 cm long and 5.00 mm wide?

62. science

An astronaut on a space walk bumps the shuttle and starts moving away at a velocity of 0.02m/s. The astronauts mass is 100kg. He has takes a 1kg "safety week" and shoves it away in exactly the direction of his motion at a speed of 6m/s. What speed does the

63. Math

If an object is launched straight up into the air from a starting height of h_{0} feet, then the height of the object after t seconds is approximately h=-16t^2+v_{0}t+h_{0} feet, where v_{0} is the initial velocity of the object. Find the starting height

64. Applied Calculus

An underground electricity cable is to be laid between two boat docks on opposite banks of a river. One boat dock is 600 feet downstream from the other. The river is 200 feet wide. If the cost of laying the cable is \$50 per foot under water and \$30 per

65. physics

A man with a mass of 62 kg skis down a frictionless hill that is h = 3.3 m high. At the bottom of the hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20-kg backpack and skis off a 2.0-m-high ledge. At what horizontal

66. Math

In Triangle ABC, AC = BC and mC = 62°. The longest side of the triangle is: AC BC AB AM

67. Algebra

I have two questions-- 1.What is the population of a town after 6 years if it is increasing annually by 3.5%. The population is at 6,000 people right now. I did6000x(1+0.035)^6 = 7375.53 or 7376 people 2. The value of car is 28,000 dollars. If car

68. Math

Perform the indicated operations with the following two functions. f(x)=x2 +7x-4 and g(x)=3x-12 3. f(x) + g(x) 4. f(x), g(x)≠ 0 g(x) thanks for the help!

69. algebra

Given the function G(v)=5v+7, find each of the following, G(2)=, G(-7)=, G(6.5)=

70. english

does this make sense? Figure 1. Protein Analysis - Determination of the protein concentration of casein in an unknown sample after the addition of the biuret reagent from the results over test tubes 1 to 5.

I am doing a unit on public transportation in New York city for my 3rd grade class and I am having a little trouble finding interesting and fun websites that my students could use to get information on past and present types of public transportation. Do

72. chemistry

What is the pH of the solution created by combining 11.50 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values for HCl and HC2H302 if you take into account that the 8.00 mL of 0.10 M

73. ECON

I am working on this but, if I have part a and b wrong, all of the following question related will be wrong. Can you help me out? The market for product A has the following functions: Market demand Q=1,000-4P Market supply Q=1/2P Inverse market demand

74. 3 Questions

I have three True/False questions. If they are false, please explain why. It is due Monday. 1. A shift in supply causes the price of a good to rise. The shift must have been an increase in supply. I think this is True. 2. The price of good X rises. This

75. algebra

On the fastest speedways, some drivers reach average speeds of 2 miles per minute. Write a formula that gives the number of miles M that such a driver would travel in x minutes. How far would this driver travel in 32 minutes?

76. Math

The temperature starts at 70 degrees and drops by 1/10 every 2 minutes. What would the temperature be after 6 mins

77. Math

There is a 100 question multiple choice test each with 5 choices. You randomly guess each question. Set up the binomial probability formula to find the probability of getting exactly 80 correct out of 100. Check to see if you can use the normal

78. math-calculus

The following equation shows the approximate relationship between the percentage y of total personal consumption spent on food and the corresponding percentage x spent on education. y = 38/x^0.38 percentage points; (6.5 ≤ x ≤ 17.5). According to the

79. Applied Calculus

If an object is launched straight up into the air from a starting height of h_{0} feet, then the height of the object after t seconds is approximately h=-16t^2+v_{0}t+h_{0} feet, where v_{0} is the initial velocity of the object. Find the starting height

80. Applied Calculus

If an object is launched straight up into the air from a starting height of h_{0} feet, then the height of the object after t seconds is approximately h=-16t^2+v_{0}t+h_{0} feet, where v_{0} is the initial velocity of the object. Find the starting height

81. Algebra

4(r-6)+1>5(r+3)-25 the solution set is ?

82. math

what is 881/1 as a mixed number

83. Geography

Can you suggest some legends stories for South Sumatra?

84. physics

How long would it take for the Earth to complete a full turn if a person at 49.2° northern geographical latitude floats apparently weightlessly across the room? Use REarth = 6,385 km for the radius of Earth

85. austin

seth has three times as many stickers as evan. together they have 52 stickers. how many stickers does each person have?

86. Statistics

Considering that a researcher can test at the

87. statistics

If a researcher were studying the effects of a teaching method on patient learning outcomes, how does the research question need to be worded to use a t-test to test for statistical differences? What type of data needs to be collected and why?

88. world history

whom did the committee of public safety consider to be enemies of the state?

89. MGT262

How to prepare a presentation recommending changes in the current performance appraisal program at StopNShopNow?

90. Statistics

Can any one help me with this? ThermoStar has been producing residential thermostats for over 50 years. Looking over the past 20 quarters (5 years) of the different product lines, the general manager has been trying to get a handle on sales, costs, and

91. math

i am trying to figure this out make 4 8's equal 640 can you help me and thank you very much.

92. armstrong

Which of the rules that make up the HIPAA law affect technology in a health care or human service organization?Summarize the relevant rules in your own words.

93. chemistry

well is there now 12 oxygens on the left side from the other 4 oxygens from the MnO4 or do they make water?

95. math

2a/x-1-2x/x-2

96. To: Writeacher or any other english helper

I had posted a question earlier about my essay but have received no help? is there no one who can help me? If you haven't seen the movie or read the book then i understand but please help if you can, really appreciated:)

97. Chemistry

how many grams of hydrogen occupy 40 ml at 300.15 K and 710 torr?

98. Math

The probability that Aaron sees Hannah on any given day is 1/2. What is the probability that he sees her 3 out of all 5 days this week?

99. calculus

Find the center of mass of the region bounded by the curve y = x3 - 4x2 +3x ; the x-axis ; x = 0 ; x = 1