Laurie

Most popular questions and responses by Laurie
1. Science

A basketball momentarily changes shape as it bounces off the floor. This is due to balanced forces acting on the ball. True False False?

2. Chemistry

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 6 to n = 1.

3. Math

Mr. Thomas spent 1600.00 of his savings on a TV and 2/5 of the remainder on a refrigerator. He had 1/3 of his original amount of savings left. What was Mr. Thomas's original savings?

4. English

My father was a hard working man but didn't earn much money. Is this sentence correctly punctuated?

5. biology

If a brown-eyed man marries a blue-eyed woman and they have ten children, all brown-eyed, can you be certain that the man is homozygous? If the eleventh child has blue eyes, what will that show you about the father’s genotype?

6. Physics

If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length? The length of the rod will become exactly half of its original value. The length of the rod remains the same.

7. Math

40 students are in the science club. 45% are girls. New girls enter the club and now the percentage of girls is 56%. How many new girls join the club?

8. Math

Donations to an annual fundraiser are 15% greater this year than last year. Last year, donations were 10% greater than the year before. The amount raised this year was \$10,120. How much was raised 2 years ago?

9. physics

If a rod is moving at a velocity equal to 1/2 the speed of light parallel to its length, what will a stationary observer observe about its length? The length of the rod will become exactly half of its original value. The length of the rod remains the same.

10. Physics

Six light bulbs are connected in parallel to a 9.0 V battery. Each bulb has a resistance of 3.0 ohms. What is the current in each bulb?

11. Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D?

12. Probability

The probability that an individual egg in a carton of eggs is cracked is 0.05. You have picked out a carton of 1 dozen eggs (that’s 12 eggs) at the grocery store. Determine the probability that at most two of the eggs in the carton are cracked

13. calculus

Find equations for the lines that are tangent and normal to the graph of y = sinx + 3 at x = pi

14. Technology

1. Which of the following is NOT an example of a objective question? A. multiple choice B. essay** C. true/false D. matching 2. Why is it important to recognize the key word in an essay question? A. It will provide the answer in an essay B. It will show

15. Physics

1. A car decelerates at -3.8 without skidding when coming to rest on a level road. What would be its deceleration if the road is inclined at 9.3° and the car moves uphill? (Asume the same static friction coefficient and the car is on the verge of

16. physics

Lasers are used to try to produce controlled fusion reactions. These lasers require brief pulses of energy that are stored in large rooms filled with capacitors. One such room has a capacitance of 64 10-3 F charged to a potential difference of 7 kV. (a)

17. physics

An 9.0 m, 210 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50.0° angle with the ground. How far up the ladder can an 890 N person climb before the ladder

18. math

An arcade uses 3 different colored tokens for their game machines. For \$20 you can purchase any of the following mixtures of tokens: 14 gold, 20 silver, and 24 bronze; OR, 20 gold, 15 silver, and 19 bronze; OR, 30 gold, 5 silver, and 13 bronze. What is the

19. American History

I know that the reasons for the United States entrance into WWI are to ensure Allied repayment of debts to the United States and to prevent the Germans from threatening U.S. shipping, but how can I explain them more specifically? Please give me some ideas.

In isosceles triangle DEF, DE=DF. Which of the following is true? 1)

21. Probabilities Help

The probability that an individual egg in a carton of eggs is cracked is 0.05. You have picked out a carton of 1 dozen eggs (that’s 12 eggs) at the grocery store. Determine the probability that at most two of the eggs in the carton are cracked

22. Probabilities Help

The probability that an individual egg in a carton of eggs is cracked is 0.05. You have picked out a carton of 1 dozen eggs (that’s 12 eggs) at the grocery store. Determine the probability that at most two of the eggs in the carton are cracked

23. Thank You To All of You Who Help

Thank you to all the people that answers questions on this website. It is truly helpful to people like me. I don't know how to respond to those of you that help me, but Thank You!

24. Calculus

Find the area of the region enclosed by the parabolas y=x^2 and y+2x-x^2

25. Chemistry

A 1 kg block of ice, at 0.0 celcius is added to a picnic cooler. How much heat will the ice remove as it melts into water at 0.0celcius?

26. Algebra

Consider the quadratic function f(x) = – x^2 + 10x – 26. Determine whether there is a maximum or minimum value and find that value.

27. Physics

The average wind speed at a height of 80m over the North Sea is estimated to be about 9 m/s. Norway plans to build a 10-MW wind turbine in the North Sea, which will have blades of diameter 145m producing an average of 3 MW of power. Calculate the

28. Algebra

Let "n" be a positive integer. How many points (x,y) in the coordinate plane are there such that x and y are integers and 0

29. math

A depositor opens a new savings account with \$ 8000 at 8 % compounded semiannually. At the beginning of year 3​, an additional ​\$6000 is deposited. At the end of four ​years, what is the balance in the​ account?

30. Chemistry

Nitrogen effused through a pinhole 1.7times as fast as another gaseous element at the same conditions.Estimate the other element's molar mass. Answer in units of g/mol

31. Math

Lianne has nineteen coins worth \$1.45. Some coins are dimes & the rest are nickels. How many dimes does she have. I understand the D + N = 19 & the 10D + 5N = 145, but I don't understand how you'd subtract them from each other?

32. Math

Find two numbers whose product is 20 and whose quotient is 5

33. algebra

Joey is flying a kite that is attached to a string 200 yards long. The kite is as high as it can go and is flying directly above Joey's house which is 50 yards in front of Joey. How high above the ground is the kite?

34. MATH

HOW DO YOU MULTIPLY FRACTIONS? what is quik and easy way to mutply fractions Multiply the numerators (top numbers) and multiply the denominators (bottom numbers). Place the multiplication of the top numbers on the top of a new fraction and the bottom

35. Physics

The human eye can detect light of wavelengths up to 400 nm. Calculate the temperature at which a heated piece of metal would start to emit visible light (start to glow red). I used Wien's law and got 7,250 K, but I'm not sure if it's correct since metal

36. Math

A farmer has 1,000 yards of fence to use to make a rectangular corral. Let x be the length of the corral. Why does A(x)=x(500-x) represent this situation? Where did the 500 come from?

37. math

How many edges are in K15, the complete graph with 15 vertices

38. t-test

For a single-sample t-test the t(17) = 2.90, p

39. Data Management gr. 12

I am so confused about correlation equations. I don't know at all how to use them r= W (x-xXy-y)=Sxy __________________ n *the equation doesnt look exactly like this but it is similar, if i can get any help at all that would be great example question:

40. Algebra

f(x)=root sign, and inside that x-2 and g(x)x-7. Which of the following is the domain of the quotient function? A. (-infinity,2] B. (-infinity,7) U (7,infinity) C. [2,7) U (7,infinity) D. (2, infinity)

41. chem

what is the theoretical yield for the balanced equation Ti+2F2= TiF4 if the mass is 0.227 Ti, 0.296 F2?

42. chemisty

if you react 1.20g of copper metal with excess silver nitrate, how many moles of silver metal are produced?

43. Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D? No one has answered

44. Chemistry

What volume of 3.0M sodium hydroxide will be needed to neutralize 2.0 L of 1.0M hydrochloric acid?

45. Chemistry

A 23 L flask at 254 K and 19 Torr contains nitrogen. What mass of nitrogen is present? Answer in units of g.

46. health HCA/210

I have a 10 to 12 powerpoint slide due next week and I just wanted to get started on it. I need to explain where health insurance began, the purpose of health insurance, and I have to list the advantages and disadvantages to HMOs, Managed care, PPOs, POS,

47. agriculture

can you unscramble this. It has to do with farming. dgpcrtouins

48. Algebra

A contagious disease is infecting residents of a town of 7,300 residents. The number of residents infected t days after the disease has begun is given by the function f(t)=(7300)/1+500e^-0.5 t How many residents are infected with the disease after 6 days?

49. Math

What do you get when you multiply the mixed number 4 2/7 by the mixed number 6 2/5 and reduce to its lowest terms?

50. latin

is there a site that i can practice simple sentence translations, where it will give the answer if i am wrong?

51. Biology 20

The removal of urea is a critical function of the Kidney. Explain th origin of urea and the mechanism by which the kidneys ensure its secretion.

52. Microeconomics

10. Bob must ship his belongings worth 1,000 to England from Latin America. The prob- ability that a ship sinks and he loses the entire value of his shipment is 0.1. Assume that if one ship sinks it does not affect the probability that the second ship

53. Physics

The length of the rod will become exactly half of its original value. The length of the rod remains the same. The length of the rod will decrease. The length of the rod will increase. Wouldn't the length double, thus being answer D?

54. Math

Use a radius of 50 and 3 for pi to estimate the area. Then use a radius of 40 and 3 for pi to estimate the area. Is your answer reasonable? Why?

55. Chemistry

Element X has three istotopes, X⁹⁵, X⁹⁶, and X⁹⁸. Element X has an atomic mass of 96.344u. If X-98 has a mass of 98.0001u and an abundance of 19.8%, what are the abundances of X-96 (mass of 95.9988u) and X-95 (mass of 95.0011u)?

56. Marketing

Describe how companies have used marketing data to target wants and need.

57. math

1. 3y=13divided by 2=>y= 2. 6divided by 15=12divided by y =>y= 3. 8 divided by 5 y - 4 = 20 =>y = 4. 3:8= y:32 =>y=

58. Algebra

Confused Please Help! Thanks! Let f(x) = 1 – 3x^2. Which of the following is true? Give a brief explanation. A. f is an odd function B. f is an even function C. f is neither odd nor even D. f is both odd and even

59. Algebra

Consider the line with equation 5x – 2y = 10. (a) Find the y-intercept for the given line. (b) Find the slope for a line parallel to the given line. (c) Find the slope for a line perpendicular to the given line.

60. Math

What is the sum of 2/3, 3/8, and 5/12 reduced to its lowest terms?

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62. Essay Writing

In the sentence: "Dr. Phil counseled the mother of a four-year-old who weighs 150 lbs." Would it be better to say, "Dr. Phil counseled the mother of a child who weighs 150 lbs." Because wouldn't the first sentence be considered wrong because it states the

63. Child Development

Identify the components of the information processing theory

64. Biology 20

with your knowledge of capillary structure and function explain how edema (tissue swelling) occurs with severe burns.

65. statistics

A random sample of n=16 scores is obtained from a population with a mean of µ= 80 and a treatment is administered to the sample. After treatment, the sample mean is found to be M=82. a)Assuming the sample contained n=16 individuals, measure the size of

66. Social Studies

In what present-day states do the Cheyenne live?

67. Algebra

Let "n" be a positive integer. How many points (x,y) in the coordinate plane are there such that x and y are integers and 0

68. algbra 2

Can you let me know if the answer to the following problem is 11 2/3? Thank you 4² + [15 ÷ 9 - 3(2)] = 11 2/3??

69. Math

A car rental company charges \$100 for the first 50 miles and \$10 for every additional 10 miles. If Gregg traveled 150 miles, how much would he pay?

70. math

A car rental company charges \$100 for the first 50 miles and \$10 for every additional 10 miles. If Gregg traveled 150 miles, how much would he pay? I know the answer intuitively is \$200, but how do I set up this equation

71. Calculus

2x -------- (x-2)(x+2) using partial fractions That's supposed to be a division sign of some sort

72. Calculus

xe^x using integration by parts

73. Biology

What could be a benefit for a plant that can switch between cyclic and non-cyclic electron transport? Think about the products of electron transport and what products are needed for the Calvin Cycle.

74. Algebra

Multiply: -8(2a+4b-6)

75. statistics

Want to find if students who are musicians have higher Iq test scores than the general population. the researcher predicts that playing music is associated with higher IQ scores. the researcher selects a sample of 75 musicians from area and gives them an

76. math

Find (gof)(-2) f(x)=Squareroot of 4-x; g(x)=1-3x^2

77. calculus derivatives

Please confirm: {(5x+2)^4/x^2-3x+1)^3}= 20(5x+2)^2(x^2-3x+1)^3 -3x^2(5x+2)^4 (x^2-3x+1)^2/(x^2-3x+1)^6

78. math

how to factor w^2r^2-1

79. ETHNIC DIVERSITY

I am trying to locate credible information in regards to the following question. Please note, I do not want the answers, just possible locations that might provide me with a place to start looking as I can not find anything recent. According to research

80. math

Find the volume of a cone with a height of 7.1 m and a circular base whose radius is 3.2 m. Use 3.14 for pi.

81. English

Can you tell me if I have this correct? I have to identify the adjectives and adverbs in this paragraph. Adjectives: early first huge high several Adverbs: monthly severely monthly ridiculously eventually immediately monthly Like so many people, early in

82. literature

In the book code orange: How do they cure the small pox?

83. need help

I have this equation y+x=-7 I have to graph my answers to find out what my y is. I have tried everything, and I cannot get my points to cross. Any help would be great.

84. Gender

How does the English language that is spoken in the US accomplish that men are portrayed as independent and serious, and are defined and described by activities and accomplishments?

85. english

select the sentence in which the verb correctly agrees with the subject.

86. Communication and Listening Studies

When a speaker is 20 years older that the person listening, the listener's ability to listen is affected by what factors?

87. american government

Consider the phrases “A belief in equal rights has often led to the belief in equality of opportunity;” and “American society does not emphasize equal results or equal rewards;” on p. 141 of the text. Explain these conceptions of equality in 200 to

88. math

trying to unscrable the letters jeatdcn into a math word

13-5e^2x=3

90. Algebra

Solve. Find the exact solution(s). Simplify as much as possible. Show work. 2x^2 + 4x – 1 = 0

91. Algebra

What is the answer? I came up with C. is this correct? Thanks for the help in advance! f(x)=root sign, and inside that x-2 and g(x)x-7. Which of the following is the domain of the quotient function f/g? A. (-infinity,2] B. (-infinity,7) U (7,infinity) C.

92. Math

What is the simple interest on a loan of \$18,500 at 11% interest for 18 months?

93. Math

What do I get when I change the fraction 38/8 to a mixed number and reduce to its lowest terms?

94. Math

A computer store sold a total of 300 items in a month, and sold six times as many hard drives as they did CD-ROM drives, and half as many floppy drives as hard drives, how many of each item were sold?

95. Math

What is the value of G in the equation G/5-13=42?

96. BIOLOGY 20

The kidneys are not the only organs which play a role in excretion. Describe the excretory function of two other body organs.

97. Biology 20

10 subjects consumed 8 cups of coffee within 1 hour. and 10 subjects consumed 8 cups of water in the same time period. The subjects were asked to collect and measure the amount of urine they produced. a) what is the probable hypothesis or relationship

98. Biology 20

explain how vaccines help in combating diseases.

99. Biology 20

Explain how low and high blood pressure can contribute to kidney failure.