# Questions Asked onOctober 2, 2009

1. ## Physical Sci

The Dyson sphere is an hypothetical spherical structure centered around a star. Inspired by a science fiction story, physicist Freeman Dyson described such a structure for the first time in a scientific paper in 1959. His basic idea consisted of an

2. ## PHYSICS - plz help

A house painter uses a chair and pulley arrangement to lift himself up the side of a house. The painter's mass is 69.2 kg and the chair's mass is 24.0 kg. With what force must he pull down on the rope in order to accelerate upward at 0.379 m/s2? The rope

3. ## AP Physics Halley's Comet

Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach. Estimate the greatest distance of the comet from the sun. Is it still in the Solar System? What planet's orbit is nearest when

4. ## Medical Physics

A block is acted on by a force that varies as (2.8*10^4 N/m)x for 0

5. ## Physics

Calculate the effective value of g, the acceleration of gravity, at 6400m , above the Earth's surface. Calculate the effective value of g , the acceleration of gravity, at 6200km , above the Earth's surface

6. ## Physics

The Russell Traction System To immobilize a fractured femur (the thigh bone), doctors often utilize the Russell traction system illustrated in the figure. Notice that one force is applied directly to the knee, F_1,while two other forces, F_2 and F_3 are

7. ## chemistry

The reaction of chlorine (Cl2) with 1,4-dimethylcyclohexane (show three possible monochlorination products) *what?!*

8. ## Ap Physics

Water skiers often ride to one side of the center line of a boat, as shown in the figure . In this case, the ski boat is traveling at 15 (m/s} and the tension in the rope is 80 N. If the boat does 3600 J of work on the skier in 51.3 m, what is the angle

9. ## Physics

A golfer rides in a golf cart at an average speed of 3.10 m/s for 21.0 s. She then gets out of the cart and starts walking at an average speed of 1.60 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and

10. ## Calculus

The limit below represents the derivative of some function f at some number a. State such an f and a. lim x-->2 2^x-4/x-2 f(x)=_______ a=_______

11. ## math

A Ferris wheel 28.0m in diameter rotates once every 21.0s. What is the ratio of a person's apparent weight to her real weight at the top? What is the ratio of a person's apparent weight to her real weight at the bottom?

12. ## Science

How long would a day be in seconds if the Earth were rotating so fast that objects at the equator were apparently weightless?

13. ## Math

tRANSLATE TO AN INEQUALITY. uSE THE VARIABLE X. tHE PRICE OF A BASEBALL GLOVE IS AT MOST \$36.49. tHE ASNWER IS ? ? \$ ?. Have no clue!

14. ## univ-phys

Two objects attract each other gravitationally with a force of 2.5×10^-10N when they are 0.22m apart. Their total mass is 4.50kg. Find their individual masses.

15. ## statistics

You forget to set your alarm with a probaility of .3. If you set the alarm it rings with the probabilty of .8. If the alarm rings, it will wake you on time to make your first class with the probability of .9. If the alarm does not ring, you wake in time

16. ## statistics

Two flower seeds are randomly selected from a package tha tcontains five seeds for red flowers and three seeds for white flowers. a.) What is the probability that both seeds will result in red flowers? b.) What is the probability that one of each color is

17. ## statistics

The probability that a certain door is locked is.6. The key to the door is one of five unidentified keys hanging on a key rack. Two keys are randomly selected before approaching the door. What is the probability that the door may be opened without

18. ## Astro

What is the distance in meters from the Earth's center to a point out-side the Earth where the gravitational acceleration due to the Earth is 1/20 of its value at the Earth's surface?

19. ## Physics

Three objects are connected as shown in the figure below. They move along a horizontal, frictionless surface, and are pulled to the right with a force Fext = 1.3 N. With the three mass values given as m1 = 726 g, m2 = 633 g, and m3 = 782 g. Calculate the

20. ## Algebra

Joe's electric made 18 customer calls last week and 25 calls this week. How many calls must be made next week in order to maintain an average of at least 21 calls for the three week period at least __ calls must be made to maintain an average of 21. Is the

21. ## 205

The Death Penalty Should Not Be Abolished "Capital punishment produces a strong deterrent effect that saves lives." Muhlhausen argues that capital punishment should not be abandoned because it deters crimes, saves lives, and the majority of American

22. ## Algebra

A certain kind of animal weighs about 71 pounds at birth and gains about 2 pounds per day for the first few weeks. Determine those days for which the animal's weighs more than 117 pounds. The animal's weight is more than 117 pounds when the animal is more

23. ## Biochemistry

Just need help. Question: One strand of DNA is completely transcribed into RNA by RNA polymerase. The base composition of the DNA template strand is: G =20%. C=25%, A=15%, and T=40%. What would you expect the composition of the newly synthesized RNA to be?

24. ## chemistry

2 Mg(s) + O2(g)= 2 MgO(s) ÄH= -1204 kJ How many grams of MgO are produced during an enthalpy change of 96.0 kJ?

25. ## Algebra 1A

I need help please!!! Translate to an inequality. The average speed, s, was between 130 & 140 mph. Translation 130 ? s ? 140. Thanks

26. ## accounting

If total liabilities decreased by \$25,000 during a period of time and owner's equity increased by \$30,000 during the same period, the amount and direction (increase or decrease) of the period's change in total assets is ________

27. ## biochemistry

I just wanted to clarify anwsers. Question 23. Nucleotides contain phosphate groups bonded to the.. A) C3' or c5' atoms B). C3 or C3' atoms C). N1 or N9 Atoms D). C3 or N9 atoms E). C3 or C5 atoms The anwser that I chosen in A. QUESTION 19. When the

28. ## Physics

A particular sprinter reaches a horizontal acceleration of 13.3 m/s2 out of the starting block. The starting block is tilted such that the vertical component of the force which the starting block exerts on the sprinter compensates for the weight of the

29. ## physics

A power boat of mass 460 kg is cruising at a constant speed of 8.9 m/s. The propeller provides a drive force of 765 N. The driver of the boat shuts off the engine, and the boat coasts to a halt. Assume -- contrary to fact -- that the resistive force due to

30. ## Physics

The figure below shows a standard man intending to do reverse curls in a gym (standing up with Tension up, weight of arm down and force down). He holds his arms straight, using an overhand grip to hold the bar. If the mass of the bar is given as 146 kg,

31. ## history

what are the major differences and similarities between the early northern and southern colonies at either the political,cocial, or the economic level.

32. ## Science

It can be shown that for a uniform sphere the force of gravity at a point inside the sphere depends only on the mass closer to the center than that point. The net force of gravity due to points outside the radius of the point cancels. How far would you

33. ## physics

Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 5400km.

34. ## phys

a plane travels at 400 mi/r to a city away. Determine the time it takes for the round trip

35. ## 8th grade - science

the length of a string is known to be exactly 9.84cm. two students measured the string. student A used a ruler marked in centimeters and got a measurement of 10 cm. student B used a ruler marked in millimeters and centimeters and got a measurement of 9.8

36. ## Algebra

You are taking a math course in which there will be four tests each worth 100 pts. You have scores of 99, 94, & 90 on the first three tests. You must make a total of 360 in order to get an A. What scores on the last test will give you an A?

37. ## Physics

The standard man in the figure below holds with his left arm vertically a dumbbell of mass M = 5,471 g with the intention to do concentration curls. For the position shown, we consider the following four major forces: the weight of the arm and the tension

38. ## phys sci..

A 12.5kg monkey hangs from a cord suspended from the ceiling of an elevator. The cord can withstand a tension of 157N and breaks as the elevator accelerates. What was the magnitude of the elevator's minimum acceleration? What was the direction of the

39. ## english1A- Need help with my argument/thesis

This is my introduction... Gender Myths Some people wear earrings, others do not. Some people wear nail polish, while others do not. Whatever the case is, there are some people, whether male or female, who dress a certain way, either get mistaken for the

40. ## HIS 115

Use the information in the Gutiérrez Map to answer the following questions: • How and where are Native Americans presented on this map? • How might have the map’s indication of where Native Americans lived strengthened European claims of

41. ## Math 116

The formula R= -0.075t + 3.85 can be used to perdict the world record in the 1500 meter run, t years after 1930. Determine an inequality that identifies the years in which the world record will be less than 3.4 minutes. Soleve for t. t >__? round to the

42. ## Physics

A golfer rides in a golf cart at an average speed of 3.10 m/s for 21.0 s. She then gets out of the cart and starts walking at an average speed of 1.60 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and

43. ## Algebra

A metal stays solid at fahrenheit temperatures below 1710.5 Determine (in terms of an inequakity) thoses celsius temperatures for which the metal stays solid. Use the formula F=9/5 C + 32. The solution set is {C< __ fahrenheit} 1710. Round to the nearest

44. ## science

what is a scientific inquiry?

45. ## college CRT 205

Source 1 Title and Citation: Individuals can help reduce child abuse and neglect. Source Citation:Information, National Clearinghouse on Child Abuse and Neglect. "Individuals Can Help Reduce Child Abuse and Neglect." Child Abuse. Ed. Lucinda Almond.

46. ## Physics

In a historical movie, two knights on horseback start from rest 94m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.22 m/s2, while Sir Alfred's has a magnitude of 0.27 m/s2. Relative to Sir George's

the length of a piece of string is known to be exactly 9.84 cm. two students measured the string. student A used a ruler marked in centimeters and got a measurement of 10 cm. student B used a ruler marked in millimeters and centimeters and got a

List 5 traits of enzymes.

49. ## Sociology-Citing a Source

I need help citing a source APA style for my bibliography. My source is a website, an organziations website called FORGE. You might have to check it out to see what im talking about. The part i need to cite is "informatin on Zambia". Its not an article on

50. ## Physics

*Can someone please help me with this question. I'm supposed to be studing for a test and I can't seem to figure out this problem at all. I think It's FRICTION, but I'm not sure. **If you flip a coin in the air as you travel in an airplane, the coin keeps

51. ## science

I have a science project about extreme habitat comparison.I have to choose two similar organisms that live in the same extreme habitat and compare them to find out how they are designed to survive.Can someone give me a good place to start my research?

52. ## Algebra 1A

HELP!!! Translate to an inequality. Use the variable x. The price of an amusement park ticket is greater than or equal to \$12. The inequality is _ _ \$ _. Simplfy your answer. Put the variable on the left side of the inequality. Than you!

53. ## Math

Assume it takes 180 quarter credits to get a baccalaureate degree. If 1 quarter credit counts for one classroom hour of lecture each week of the quarter and you study 2.5 hours for each hour in class,how many hours must you invest to get a degree? (You may

54. ## C Programming

I don't know what to do now. Below is my code I have so far but I have no idea what to do next. Here's the prompt for what the program should do: Welcome to the Weather Balloon Altitude and Velocity Program. Enter the Balloon's Starting Time: 1 Enter the

55. ## Pysical Science

Mass of C3H8 Reacted with (g) Mass of O2 Reacted (g) Mass of CO2 Produced (g) 44 160 132 250 909 750 400 1,455 1,200 465 1,691 1,395 6. Based on the data in the table, how do you know that carbon dioxide is not the only substance formed in this chemical

56. ## chemistry

Calculate (delta)Suniv in J/mol-K for the above process at 298.15 K. Again, balance all chemical reactions using the loweset ratio of whole numbers. 1Fe2O3(s) + 3CO(g)--> 2Fe(s) + 3CO2(g) the standard entopy change is 16.4 J/molK

57. ## Biology

Are chlorplasts necessary for the reduction of DCPIP? why or why not? and is light necessary for the reduction of DCPIP? why or why not? I

58. ## math

Solve the following inequality. Write the answer in interval notation abs value of x+4

59. ## statistics

At a certain college, 15% of the students received an A in their required math course, 10% received an A in their required Chemistry course, 5% received an A in both. A student is selected at random. a.) What is the probability tha he receieved an A in

60. ## English

"Some, when they take revenge, are desirous the party should know whence it cometh. This is more generous. For the delight seemth to be not so much in doing the hurt in making the party repent. But base and craft cowrds are like the arrow that flieth in

61. ## ALGEBRA

DURING THE FIRST PART OF A TRIP, A CANOEIST TRAVELS 35 MILES AT A CERTAIN SPEED. THE CANOEIST TRAVELS 17 MILES ON THE SECOND PART OF THE TRIP AT A SPEED OF 5 MPH SLOWER. THE TOTAL TIME FOR THE TRIP IS 3 HRS. WHAT WAS THE SPEED ON EACH PART OF THE TRIP?

62. ## english

translation for acts like a hotdog

63. ## Math

Translate to an inequality. Use the variable x. The number of people in the chess club is less than or equal to 14. The answer is ? ? ?. I am lost!!

64. ## Medical Terminology

A patient visits the doctor's office with abdominal pain of two days' duration. Medical history is significant for tonsillectomy and hypertention. The patient denies aclohol and drug abuse. the rectal examination confirms heme-negative stool. Impresion:

65. ## Algebra

A car rents for \$30 per day plus 23cent per mile. You are on a daily budget of \$76. What mileage will allow you to stay within your budget?

66. ## Physics

Two objects are in contact on a frictionless surface. A horizontal force is applied to one object as shown in the figure below. Use m1 = 0.4 g, m2 = 223 g and F = 0.7 N to find the force between the two objects. Thanks

67. ## statistics

A person owns both her own business and her own home and purchases a cariety of insurances to protect them. In any one year the probability of an insurance claim on the business is .4 and on the home is .05. Assuming that these are independent events, find

What are some ways in which you may make use of web-based information and guard against plagiarism ?

69. ## Algebra

Solve using the addition & multiplication principles 8x-13

70. ## math

I have a problem. Conner's age is 4 and josh's age is 12. I need to find out how many years until conner is half of josh's age and I am not sure how to put this in equation form.

71. ## Health-Care

Discussion Questions 1. Have you used information technology in your educational program before? Was there any terminology related to use of technology that you found difficult to understand? While taking this course, were there any terms related to the

72. ## maths

The scale of a floor plan is 1:200 in the scale diahgram, the width of the building is 14cms . Calculate the width of the building in metres The length of the building is 32m. Calculate the lenght of the building in scale diagram in centimetres

73. ## math

what is the answer to 4x7-5+2x16-7+89=.......

74. ## chemistry

Calculate the final concentration if 4.0 L of 1.5 M NaCl and 2.0 L of 3.0 M NaCl are mixed

75. ## math

1Approximately 5 out of every 8 students at Kendra's college live on campus. The college has 5,000 students. How many of them live on campus?=3,125 students 2. Solve for the unknown: 2/3/10=1.8/r=27 3. Find the best buy on cashews (1 lb is 16 oz).1 lb 4 oz

76. ## businees

Identify and explain at least three advantages and three disadvantages of the collaborative writing process. In what situations might an individual writing process be preferable?

77. ## author

I need help writing Introduction on the topic I picked. The topic is Domestic Violence

78. ## Math

If a number has to be put into standard form from the written, is that in decimals or fractions?

79. ## college

I need help with this one question with two parts... Describe the traditional role of a travel agents and tour operators compared to thier current operation?

1. 3 gal and 2 qt subtracted from 8 gal and 7 qt= 6 gal and 1 qt? 2. 980 cm = 9.8 m? 3. choose a reasbonsible weight for a cow? 500kg? 4. are these numbers perfect triples 8.10.12? no? 5. square root of 49? =7?

81. ## math

By selling a piece of land for \$700 a man made a loss of 20%.How much did he buy the land

82. ## Math

How do i find the domain and range of these functions? f(x)=x+1 f(x)=2/x f(x)=(x+1)/(2x-5) f(x)=sqrt(x+1) f(x)=sqrt(3x-9) f(x)=1/sqrt(x-5)

83. ## physical geology

what are two categories of metamorphic rocks?

84. ## English

Can anyone solve this? My faith promoted me from shepherd boy to army commander. I am a talented musician and poet, my works are written in a famous book. The king was jealous of my success and plotted to kill me. Thanks.

85. ## math

how do i find the number of degrees in the point angle of a {9/2} star polygon

86. ## To SraJMcJin

Sra I read your post, and yeah I really do not know how to make the accent marks. I have a PC Windows. Can you please provide a chart for me, thanks

87. ## science

whice is a chemmical property????? 1; has a melting point of 22 degre cels 2; has a sweet odor 3;makes bubbles when added to vingar 4; disolves in water

88. ## math

7.Write the ratio of 4 1/3 to 6 in simplest form. 13/3 TO 6/1 8.On the blueprint of Lauren's new office building, the scale is 9 in. equals 8 ft. What will be the actual length of Lauren's office if it measures 6 in. long on the blueprint? Give your answer

89. ## checking answers for math

1. 3 gal and 2 qt subtracted from 8 gal and 7 qt= 6 gal and 1 qt? 2. 980 cm = 9.8 m? 3. choose a reasbonsible weight for a cow? 500kg? 4. are these numbers perfect triples 8.10.12? no? 5. square root of 49? =7?

90. ## crt

Over time, non-specialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion

91. ## chemistry

substance A has a boiling point of 80 degrees cel and a denisty of 3.5 g/cc. substance A which one; a; might be an element b; must be an element c; must be a compound d; might be a mixture

92. ## Chemistry

If molecule of NaCl is heavier than a molecule of NaOH and NaOH is heavier than a molecule of HCl, can you explain the different conductivites you observed for these compounds?

93. ## tax question

if i earn 12,800 per year and i am paid 12 times per year and i claim 1 exemption and i am taxed by my state at 3% how much is withheld per pay period?

94. ## 8th grade - science

i have the same problem as before,only 3 more questions about it. please help!! how precise is the ruler originally used to measure the string? explain. what is the length of the string to the nearest centimeter? what is the length of the string to the

95. ## language

A novel differs from a short story because it A. includes a theme. B. comprises rising action, a climax, and falling action. C. is more likely to include subplots. D. is told as a third-person narrative.

96. ## Math 116

The length of a rectangle is fixed at 29cm. What withs will make the perimeter greater than 70cm? The width must be greater than __ cm.

97. ## health

Identify and describe three causes for the increasing costs of health care. What impact does each of these causes have on society?

What happens when corporations merge and there are different cultures, how are HR functions resolved?

99. ## science

a train traveling at 100 km/h reduces its speed uniformly to rest in minutes.how far will it travel in 5 min

100. ## calculus

Find the limit. lim (5u^4+7)/(u^2-2)(2u^2-1) u-->infinity

101. ## Mathematics

Does anyone know how to type algebra problems in my macbook computer to post to a thread?

102. ## just a ?

What are some causes of residentail segregation, and are there any solutions?

103. ## predicting conseqences

what would be the consequence if Lawndale Preschool is building its new play yard near a busy street

104. ## Math

9 - 4 How do you turn fractions like this one into a decimal?

105. ## To Challie

Students come to this board to get help from experts. Please do not post irrelevant "answers."

106. ## french

Can someone help me with this sentence? Quelquefois, je me suis senti inadéquate parce que je n'ai pas acquis beaucoup d'expérience en dessin. my teacher circled "n'ai pas" i do not know what is wrong with it:(

107. ## Calculus

Find the limit. lim (x+2)/(radical(9x^2+1)) x-->infinity

108. ## algebra

help with 3 1/4 x X = 3/4

109. ## social study

the problem of marriage

1. m

1. A list of context-sensitive commands usually activated by right-clicking a screen item. What's this call? a)option group b)drop-down list c)short-cut menu d)dialog box 2.A small preview image of a graphic is a) picture b) thumbnail c) icon d) pixel 3.Is