Questions Asked onJanuary 17, 2008

1. Physics

A 4-kilogram mass has a speed of 6 m/s on a horizontal frictionless surface. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and sticks to a third 4-kilogram

2. math

First grade math Tell the Rule? Group 1 3 flowers w/4 petals each Group 2 3 flowers w/five petals each in triangle?

3. Math

How do I find the next number in the patter, 5,11,29,83,245 ? I think it's 454, but not sure how to figure it

4. physics.

80 N and 60 N force act concurrently on a point. find magnitude of the vector sum if the forces pull -in the same direction -in opposite direct. -at right angles to each other seriously, i don't understand what you are supposed to do

5. physics

im not sure how to do this question 80 N and 60 N force act concurrently on a point. find magnitude of the vector sum if the forces pull -in the same direction -in opposite direct. -at right angles to each other thanks

6. physics

In an emergency stop to avoid an accident,a shoulderstrap seat belt holds a 60-kg passenger firmly in place. If the car were initally traveling at 90 km/h and came to a stop in 5.5s along a straight, level road, what was the average force applied to the

7. math

Operations with scientific notation Perform the indicated operation. Each final answer must be written in scientific notation. 1. (2.34*10^5)*(-4*10^-8) 2. (4*10^3)*(4.5*10^-3) 3. (5*10^5)*(4.3*10^2)

8. math

WHAT IS THE LEAST NUMBER THAT IS DIVISIBLE BY 2,3,4,5,6,9AND 10 EXPLAIN HOW YOU FOUND YOUR ANSWER

9. social studies

what magical figures were wrapped within a mummies wrappings

10. Quantitative methods

Allen must decide whether to invest \$10,000 in the stock market or in a certificate of deposit (CD) at an interest rate of 9%. If the market is good , he believes that he could get a 14% return on his money. With a fair market, he expects to get an 8%

11. physics

a 1.5-kg object moves up the y-axis at a constant speed. When it reaches the origin,the forces F1 =5.0 N at 37 deg above the the + x-axis, F2 = 2.5 N in the +x-direction, F3 = 3.5 N at 45 deg below the -x-axis, and F4 = 1.5 N in the -y direction are

12. Physics

A vacant, 1560 kg car begins from rest and rolls 46 meters down an inclined plateau before rolling off the edge and crashing into the sea below. The plateau is at a constant downward angle of 12.4 degrees with the horizontal. The coefficient of rolling

13. Science ; help pleaase

1. In what way are the ocean currents in the Southern Hemisphere 'mirror images' of those in the Northern Hemisphere? 2. On which side of Australia (east or west) would you expect to find deserts? rain forests? Explain why. 3. In what other regios of the

14. Earth Science

Why is a minimum of three seismic stations needed to find the epicenter of an earthquake?

15. Chemistry

Explain the following observations using chem principles: When table salt and sugar are dissolved in water, it is observed that: 1. Both solutions have a higher boiling point than pure water. 2. the boiling point of .1 M NaCl solution is higher than that

16. Chemistry

Two beakers are placed in a sealed container surrounded with air. In one beaker is pure H2O (Beaker A) and the other beaker is a 10% Sugar solution (Beaker B). As the system approaches equilibrium what change occurs to the volume of water in beaker A? What

17. chemistry

Zn(s)+2H+(aq)->Zn2+(aq)+H2(g) Br2(aq)+2I-(aq)->2Br-(aq)+I2(aq) Name one compound containing H+ ions and another containing I- ions, which would be suitable for these reactions. Ezplain why zinc is said to be oxidised in its reaction. Complete the half

18. Chemistry

Below shows 3 displacement reactions involving metals and solutions of metal nitrates. Cu+2AgNO3->Cu(NO3)2+2Ag Pb+Cu(NO3)2->Pb(NO3)2+Cu Zn+Pb(NO3)2->Zn(NO3)2+Pb Use this information to find the order of reactivity of the 4 metals, with the most reactive

19. algebra 2

A. I need to write an equation to the linear equation..(-2,-2), (3,3). B. I need to graph the function of y=|x| on a coordinate plane. C. I need to give one similarity and one differnce for the equations and graphs in parts A and B. I really need your help

20. Physics

A 2.0 x 103 kg car is pulled 345 m up a hill that make s an angle of 15° with the horizontal. What is the potential energy of the car at the top of the hill? If the car rolls down the hill, what will its speed be if we neglect friction? plz help? confused

21. Chemistry

Zn(s)+2H+(aq)->Zn2+(aq)+H2(g) Br2(aq)+2I-(aq)->2Br-(aq)+I2(aq) Name one compound containing H+ ions and another containing I- ions, which would be suitable for these reactions. Ezplain why zinc is said to be oxidised in its reaction. Complete the half

22. Science- weather

1. Two clouds are about the same size. One appears light in colour and the other appears dark because it blocks more sunlight. Which would be a better heat sink? Why? --- ..would the darker one be a better heat sink?; because it gets heat more.

23. physics

Two charged bodies exert a force of 0.390 N on each other. If they are moved so that they are one-third as far apart, what force is exerted? is it .390 times 3??

24. Physics

A 13 kg bucket of water is attached toa rope that is wound around a cylinder whose radius is 10.3 cm. A crank with a turning radius of 44.6 cm is attached to the cylinder. If the bucket accelerates upwards at a rate of 1.21 m/s^2, then how much tension is

25. Math

I need to find the length of the missing side of a triange that has a side of 24 and another 10. (hint is to use a(squared) + b(squared) = c(squared) would it be 56?

26. CHEMISTRY

A 8.90-g sample of ethane, C2H6, is mixed with 18.8 atm of O2 (an excess) in a 1.50 L combustion chamber at 130.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 130.0°C. What is the final pressure in the

27. Chemistry

Use appropriate chemical principles to explain why water droplets form on the outside of a beaker containing an ice bath. I was thinking: The ice bath causes the beaker temperature to decreases which in turn, cause the surrounding gas temperature to

28. physics

is this right? a 50kg barbell can be lifted by usinga force of 180 N. what is the force of gravity on this planet? if the same barbell is lifted on earth, what minimal force is needed? -i got 3.6 for gravity of the unnamed planet; and 49 N for the minimal

29. Algebra 2

1. How many solutions does this system of equations have? y=-2x+6 y=3(x+4) 2. What is the square root of 45? 3. solve 2(x-4)^2=14

30. physics..

im not completely sure im right with this question a lawn spreader is pushed across a lawn by applying a force of 95N along the handle that makes an angle 60 degrees with the horizontal. a- what is the horiz. and vert. comp. of the force. b- when the

31. Gr. 3

I need help finding the main idea for my son's reading book. The title is Art Around Us. It goes like this Introduction: Art is all around us. It comes in every shape, size, & color. People who make art are called artists. They use paint, paper, clay,

what is the least number that is divisible by 2,3,4,5,,6,9 and 10?

33. math-geometry

The sum of the radii of two concentric circles is 40. A chord with length 36 of the larger circle is trisected by the smaller circle. The area of the smaller circle is k*pi. Find the value of k. Express your answer as an exact decimal. Please show work.

34. government

the debate over the powers of the presidency is essentially a debate a. about article III of the constitution b. between supporters of a strong presidency and supporters of a weak presidency c. about the system of checks and balances d. about the electoral

35. Chemistry

1)How many joules are needed to heat 8.50 grams of ice from -10.0 degrees to 25.0 degrees? 2)Calculate the hydronium ion concentration and the hydroxide ion concentration in blood, the pH of which is 7.3(slightly alkaline)

36. chemistry

Below shows 3 displacement reactions involving metals and solutions of metal nitrates. Cu+2AgNO3->Cu(NO3)2+2Ag Pb+Cu(NO3)2->Pb(NO3)2+Cu Zn+Pb(NO3)2->Zn(NO3)2+Pb Use this information to find the order of reactivity of the 4 metals, with the most reactive. I

37. Algebra

Steve is making crafts to sell at a benefit. It takes him 3/4 of an hour to make a trivet and 1/2 hour to make a wooden spoon, He has 3 hours to work. Write an equation to show the relationship between how many trivets and how many spoons Steve can make in

38. English

Can anyone summarize the story "Roughing It" because i don't get the story

39. math

Why might function notation be important? Explore the reasons for function notation and where can i find research about this

40. Geometry

A trapezoid has an area of 128in2(inches squared), height of 32in, and one base is 5 inches. What is the length of the other base? How do I figure this?

41. Chem

Use principle of atomic structure and/or chemical bonding to explain why the boiling point of Cl2 is lower than the boiling point of Br2. Make sure that your response refers to both substances.

42. Chemistry

How many joules are needed to heat 8.50 grams of ice from -10.0 degrees to 25.0 degrees I came up with 2124 joules

43. BIOLOGY

IN TERMS OF THE HIERARCHICAL ORGANIZATION OF LIFE A BACTERIUM IS AT THE _____ LEVEL OF ORGANIZATION.

44. English

I had to write a summary (~150 words) for english on the first chapter of Pride and Prejudice. Could someone please check it for me and tell me what's good/bad? 'Pride and Prejudice' commences with a conservation between Mr. and Mrs.Bennet. Mrs.Bennet has

45. investmets

July oats are trading at \$2.48, analysis says they will sell at \$2.40 in a couple of months. what kind of return on capital will she make if she shorts 3 july oats contracts ( each contract covers 5,000 bushels of oats) by depositing an initial margin of

46. Earth Science

Why is a minimum of three seismic stations needed to find the epicenter of an earthquake?

47. writing

what are the mistakes in this sentence? Mr.Gappy had ate a few of the lady's marvelous doughnuts.

48. Math

I cannot remember how to find the slope of a line when you are given two points. Here is the problem. The slope of a line through (2,1) and (5,n) is 3. n=___ I ended up with -2. But I don't think that is the right answer. I put the points in

49. Physics

A 2.0 x 103 kg car is pulled 345 m up a hill that make s an angle of 15° with the horizontal. What is the potential energy of the car at the top of the hill? If the car rolls down the hill, what will its speed be if we neglect friction? plz help? confused

50. algebra

Simplify (x+1)(x2+x-1) that should be x squared. the superscript didn't carry over.

51. Physics

(I'm only posting the questions I couldn't figure out, don't worry.) An object released from rest at time t=0 slides down a frictionless incline a distance of 1 meter during the first second. The distance traveled by the object during the time interval

52. Calc

Find the velocity of a satellite orbiting above the equator of the earth in geosynchronous orbit (Period=24 hours) in km/hr. The earth's mass M=5.974x10^(24)kg and radius R=6,731 km. G=6.673x10^(-11) m^3/(kg*s^2) Use v=(G*M/R)^(1/2) I plugged everything in

53. Physics

A hitter hits a baseball into the air. The shortstop, who was initially 33.5 meters away, begins running directly away from home plate at 7 m/s at the moment that the ball was hit and catches the ball, while still running, at the same height from which it

54. physics

in a collage home coming competion 16 students lift a sports car. While holding the car off the ground, each student exerts an upward force of 400N. (a) What is the mass of the car in kilograms? (b) what is the weight in pounds?

55. Chemistry

What is enthalpy in layman's terms?

56. Social Studies

What happend to African Americans'civil rights during wilsons presidnetry?

57. algebra

rewrite this in standard form: (0,5) m=- 3/5

58. algebra

write an equation of the line with given slope and y-intercept. Slope= -2 Y-intercept = (0,4)

59. French

What is the French of comma, period, question mark, etc... Thanks.

60. Geology--location of the university

Is University of California, Riverside situated in Southern California or Northern California?

61. Physics

A 2.0 x 103 kg car is pulled 345 m up a hill that make s an angle of 15° with the horizontal. What is the potential energy of the car at the top of the hill? If the car rolls down the hill, what will its speed be if we neglect friction? plz help? confused

Hi, can someone please proofread this for me? Topic: Explain why dating is not an effective method for screening out future divorces especially those that take place early in marriage Dating is not an effective method for screening out future divorces

63. Sci-275

Explain how limbless salamanders evolved according to Darwin's theory of natural selection?

64. Algebra 1

ok, no one has helped me with it the first time, let's see if this time is successful. Jilian wants to buy candles in case her electricity and furnace fail. Each candle she plans to use, burns at a rate of 5mL of wax per 15 min. One of these candles has a

250-100

66. Random

What are characteristics like strength, longevity and vitality called?

67. Latin

I need some help with pluperfect/future perfect translations. I shall meet You (singular) will arrive You (plural) will leave They will carry They will put on I can't figure them out for the life of me! Thanks, Natalie

68. Geometry

I have a quadilateral with the following values x-25, x+25, x-30 and the 4th angle is a 90degree and I'm supposed to find what x equals. any ideas how to figure x?

70. algebra2 help

Please explain to me how to work both these problems. Thank you. x+x^2/2 +2x^2-x= and y^2/4 + y/3 +y^2/3 -y/5= 7y^2/12 + 2y/15

71. Math

Here is the question/problem. Barney goes to the bank with 1000 -\$1 bills and 10 paper bags. His instructions to the teller are to plcae the bills in the bags in such a way that when he returns later, he can request any amount of money from \$1 to \$1000 and

72. Geometry

A pair of complimentary angles have measure x* (star equals degree) and x*(again star equals degree) + 8*. What is the measure of the smaller angle? the problems looks like x* and x*+8* AGAIN THE stars stand for degree. I think the answer is 6, but not

73. Physics

You have been asked to keep a 35.1 kilogram crate from sliding down a 50.03° incline. The coefficient of friction between the crate and the incline is 0.26, and it's on the surface of Mars (gravitational acceleration at the surface of Mars is 3.75 m/s^2).

74. math

how do you solve this? 1 5/6 ÷ 2 4/9

75. History prooject

Who were the people whom made a huge difference in segregation?

76. English

what are the advantages and disadvantes of using survey?

77. Algebra 1

Jillian wants to buy candles for winter, in case her electricity and furnace fail. Each candle she plans to use, burns at a rate of 5 mL of was per 15 cm. How many HOURS will it take the candle to burn down completely? Express the answer to the NEAREST

78. math

What is a Math Monster?

if you choose a two digit number at random ,is it more likely that the number will be divisble by 5 or by 7 ex.

80. sentence stucture

I'm reading this sentence in my head because I'm in the library. I can't read it out loud. Does this sound right to you? I'm not sure? According to the theories on mate selection, researchers have developed the idea that most people select their mates

81. Math

what is 3(x-4)-2(8-x

82. Math

Is there a way to draw a picture to get help with values in a rectangle or other shapes

83. math/physics

Help! I have no idea how to do this. The earth's orbit is nearly circular with a radius R=93x10^6 miles (the eccentricity is e=.017). Find the rate at which the earth's radial vector sweeps out area in units of ft^2/s. What is the magnitude of the vector

84. Biology

Can anyone explain why natural selection works on phenotypes? And how that affects genotypes?

Still studying navigation and am trying to consolidate my knowledge of the navigational triangle. Current interest in particular is how to establish the distance of the unknown side of the PZX triangle. From the assumed position of the ship (Z) to the

86. Algebra 2

Multiply (x-1)(x^2-2x+4) Simplify (2+i)(2-i)

87. Composition

Once the crisis has happened already, the Tertiary Prevention type helps the couple from reoccurring the crisis. Can someone tell me what is wrong with the sentence above. I have a green underline under the word "reoccuring" from microsoft word. I don't

88. OCS

What is X times X

89. vocab

stanzas and paragraphs are alike because:

90. writing

what are the mistakes in these sentences The lady and Homer was putting too much batter in the machine.

91. Math

Write an equation of the line with the given x- and y-intercepts. x-intercept: 3, y-intercept:5

989*789^2

93. math

can someone check my answers if f(x)=4x-3 find f(-1) f(-1)=4*(-1)-3=-4-3= -7

94. science

what is a mineral