1. PHYSICS

a 10cm long spring is attached to the ceiling. when a 2.6kg mass is hung from it, the spring stretched to a length of 15cm. what is the spring constant k how long is the spring when a 4.0 kg mass is suspended from it

2. physics

A game show contestant won a prize by pushing a bowling ball 20 m using her nose. The amount of work done was 1470 J. How much force did the contestant exert on the ball?

3. physics

An initially stationary 15.0-kg crate of cheese wheels is pulled via a cable a distance d= 5.70m up a frictionless ramp to a height of h= 2.50m, where it stops. What is the potential energy of the crate after it is lifted? How much work is done during the

4. physical science

A football player picks up.the football runs with it and throws it to a teammate, during which of these actions is work being done on the football?

5. physics

A 2000 kg car is moving with a velocity of 50 km/hr. What is its kinetic energy? If the car reduces its speed by half, by what factor is the kinetic energy changed?

6. Physics

Does the composition of an object affect the final temperature of in objects. This is in terms of thermal equilibrium.

7. statistics

The proportion of baby boys born in the United States has historically been 0.512. You choose an SRS of 55 newborn babies and find that 47% are boys. Do ALL calculations to 5 decimal places before rounding. (d) In a random sample of 55 newborn babies, what

8. Electrotechnics N4

A circuit,consisting of 3 resistances 12,18 & 36 ohms respectively joined in parallel is connected in series with fourth resistance.the whole is supplied at 60 volt & it is found that the power dissipated in the 12Ohm resistance is 36 watt. Determine the

9. Science

The following reaction: 2SO3 (g) ! 2SO2 (g) + O2 (g) has an equilibrium constant equal to 0.23 M. If the following concentrations are present: [SO2] =0.480 M, [O2] = 0.561 M, [SO3] = 0.220 M, is the reaction at equilibrium? If not, which way must it shift

10. Science

Part 1 Which of the following is a redox reaction? a. H2CO3 (aq) + 2NH3 (aq) → 2NH4+ (aq) + CO32- (aq) b. 2VO3- (aq) + Zn (s) + 8H+ (aq) → 2VO2+ (aq) + Zn2+ (aq) + 4H2O (l) d. Zn(NO) (aq) + 2NaOH (aq) → Zn(OH) (s) + 2NaNO (aq) part 2 For the redox

11. physics

Cars A and B are racing each other along the same straight road in the following manner: Car A has a head start and is a distance Da beyond the starting line at t=0. The starting line is at x=0. Car A travels at a constant speed Va. Car B starts at the

12. Physics

Water flows over a section of Niagara Falls at a rate of 1.2×106 kg/ s and falls 50m. How many 60W bulbs can be lit with this power?

13. Homework Help ME! Science

In the reaction mechanism below, indicate what substance is acting like a catalyst. Step 1: H2O2 (aq) + I- (aq) → H2O (l) + IO- (aq) Step 2: H2O2 (aq) + IO- (aq) → H2O (l) + I- (aq) Is the catalyst in the problem above a heterogeneous or a homogeneous

14. Chemistry

A chemist does a reaction rate analysis on the following reaction: 2CO (g) + O2 (g) → 2CO2 (g) She collects the following data: Trial Initial Concentration of CO (M) Initial Concentration of O2 (M) Instantaneous Reaction Rate (M/s) 1 0.150 0.150 0.113 2

15. GRAMMAR

Question: A predicate is the part of the sentence that always contains a noun or pronoun. TRUE FALSE The predicate is one of the two main parts of a sentence - The other being the subject. The predicate is said to modify the subject. (a statement or

16. physics

A force of 20 N is needed to overcome a frictional force if 5 N and accelerate a 3 kg mass across a floor. What is the acceleration of the mass?

17. trig

An airplane flying at 600 miles per hour has a bearing of 152 degrees. After flying for 1.5 hours, how far north and how far east will the plane have traveled from point of departure?

18. Physics

In a simulation on earth, an astronaut in his space suit climbs up a vertical ladder. On the moon, the same astronaut makes the same climb. In which case does the gravitational potential energy of the astronaut change by a greater amount?

19. Science

A chemist is studying the following equilibrium: 2Pb(NO3)2 (s) ! 2PbO (s) + 4NO2 (g) + O2 (g) He starts out with 10 g of Pb(NO3)2 and, at equilibrium, has 2.02 g of PbO. The concentrations of NO2 and O2 at equilibrium are 0.25 M and 0.019 M, respectively.

20. physics

A force of 99 N causes a box to accelerate at a rate of 11 m/s2. What is the mass of the box? (Ignore frictional effects.)

21. Chemistry!

A Galvanic cell runs on the following reaction: Co (s) + Cu2+ (aq) → Co2+ (aq) + Cu (s) Draw a diagram for this Galvanic cell, labeling the electron flow, the anode and cathode, and the positive and negative sides of the Galvanic cell.

22. physics

A body covers 30m and 40m during 10th and 15th second respectively. The acceleration and initial velocity of the body are?

23. algebra II

can someone please explain how to do this problem: A twelve-foot ladder is leaning against a wall. If the ladder reaches 8 ft high on the wall, what is the angle the ladder forms with the ground to the nearest degree? 1. 36° 2. 42° 3. 48° 4. 54°

24. Chemistry

Calculate the number of C, H and O atoms in 1.75 g squaric acid. :)

25. math

Earthquakes produce several types of shock waves. The most well-known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the earth's crust, the P-waves travel at around 6.5 km/s while the S-waves move at about 3.5

26. ANOTHER SCIENCE

Consider the following reaction that has reached equilibrium: NH3 (aq) + C2H4O2 (aq) ! NH4+ (aq) + C2H3O2- (aq) ∆H = -102.1 kJ a. What will happen to the concentration of NH4+ (aq) if the temperature is raised? b. What will happen to the concentration of

27. solve the differential equation

(D2-4D+3)y=sin2xcosx

28. systemic anatomy

The superior and inferior digestive tube consists of??

29. Chemistry

Given the following two step reaction: 4 P + 5 O2 -> P4O10 P4O10 + 6 H2O -> 4H3PO4 If you have 8.28 g of P, 15.65 g of O2, and 19.95 g of H2O, how many grams of H3PO4 can be produced?

30. Chemistry

If you have 200 ml of a 0.1M solution of acetic acid (pka=4.75), 1. How many ml of a solution of 1.O M NaOH would you need to adjust the pH to 5.2? "Chemistry - DrBob222, Wednesday, June 29, 2011 at 8:41pm 200 mL x 0.1M = 20 mmoles. 1. ............HAc +

31. ART 101 Art Appreciation

Discuss how art was used as a vehicle for propaganda in the works of Höch, Grosz, and Picasso.

Globalization and global trade have led to increased competition in world markets and increased allocation of scarce resources. Is it accurate to say that this is contributing to increased consumer surplus and reductions in inflationary pressures? If yes,

33. integral calculus..

Evaluate the following intergal:- çMvdv , with upper limit 'v' and lower limit 'u'

34. Math

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to

35. poetry

I need help determining the meter in my poem. The Ocean says, "Roar" to wake me up, And I smile as I grab my coffee cup, Because this is the day the Lord has made! I refuse to quiver and be afraid. The sunburst peeks through my window wide, And stay that

36. HS Science

I have 4 questions 1 What is the equation for the acid ionization constant of HI? 2 Give the oxidation numbers of all atoms in NaMnO4 3 An atom changes its oxidation number from -2 to -5. Is it oxidized or reduced? How many electrons did it take to do

Term of Loan/Date of Loan using Banker's Rule? I need helps in solving this question. I have to submit it by today.Tq On 4 Oct 2010, Alia paid \$8200 for his loan of \$8000 made on a certain date. If the simple interest rate was 5%, determine: a)the term of

4.What was the nature and extent of the Umayyad Empire?

39. Chemistry

Write an equation (chemical or ionic) and use oxidation numbers to find out what is being oxidized and what is being reduced. (a) aluminum + oxygen (b) magnesium + steam (c) iron + dilute hydrochloric (d) copper(ii) oxide + carbon (e) bromine + potassium

40. History

In your own words answer each questions 150 words 1. Why are elections in the United States longer, more expensive, and more candidate-centered than in European democracies? 2. Knowing that the right to vote has been such a hard-fought entitlement, why do

41. chemistry

i have the Mr of lead nitrate 331 and i thermally decompose it giving nitrogen dioxide and oxygen. i want to collect exactly 200cm3 of the gases evolved in a syringe. what mass of lead nitrate should i take ?

42. physics

A 3 kg object falls from a height of 10 m. What is its velocity just before it hits the ground? How would this problem differ if the object falling from a height of 10 m only had a mass "m"?

43. algebra

the length of a rectangle is twice its width w. A second triangle, which is 8cm longer and 3 cm narrower than the first triangle, has a perimeter 154 cm. What is the dimension of each triangle.

44. math

Find the number of round trip commuter rail tickets sold. 1.Thirty times as many round trip tickets as 12 ride tickets were sold. 2.The total number of tickets sold represented 1440 rides Example of chart below Rides per ticket x Number of tickets sold =

45. Science

Three acids solutions have the following pH: Solution A: pH = 2 Solution B: pH = 5 Solution C: pH = 3 Which solution is made with the acid that has the smallest ionization constant?

Please help me to solve the question below. An electrical appliances shop owner estimates that his sales will increase by 5% every month. The sales for the first month were \$30,000. Find: a)The sales for the 10th month b)the total sales for the first year

47. physics

Earthquakes produce several types of shock waves. The most well-known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the earth's crust, the P-waves travel at around 6.5 km/s while the S-waves move at about 3.5

48. chemistry

what mass of caesium nitrate will give 100cm3 of oxygen and nitrogen dioxide ?

49. MATH

The length of the house is 50 feet, the width is 30 feet, and from the ground to the gable (the height of the rectangle) is 10 feet. The height of the triangular prism on top is 6.5 feet.

50. algebra

a boat weighs 1500 lbs more than its motor and 1900 lbs more than its trailer. Together the boat and motor weigh five times as much as the trailer. How much does the boat weigh? Please explain or show how to set up the equation.

51. Marketing

List and discuss the 4 P’s (marketing mix) The 4 P’s in the marketing mix consist of

52. algebra

simplify 14a^8y^3-7a^4y^5+28a^12y^2/7a^4y

How long will it take the farmer to sell all his chickens? Farmer has 2100 chickens. He sells 10 chickens at the end of the first week, 20 chickens at the end of the second week, 30 chickens at the end of the third week and so on. Question: How long will

54. Chemistry

How many milliliters of 0.0850 M Na3PO4(aq) will react with 22.00 mL of 0.0800 M MgCl2(aq)? 3 MgCl2(aq) + 2 Na3PO4(aq) ==> Mg3(PO4)2(s) + 6 NaCl(aq) V x M = V x M (22.00mL)(0.0800M) = (0.0850M)(x) Is this the correct set-up? Does it have 4 sigfigs, or am I

55. physics

If a person weighs 160 pounds, and the surface area of the bottom of both feet combined is 200 cm2. What is the pressure under the person’s feet (unit: N/m2)? What is the pressure if the person stands on only one foot (unit: N/m2)? [Hint: 1 kg = 2.2 lbs,

56. Physics

In an experiment, a seabird was taken from its nest, flown a distance 5190 km away, and released. It found its way back to its nest a time 13.8 days after release. What was the bird's average velocity in m/s for the whole episode, from leaving the nest to

57. geometry

The hypotenuse of a right triangle is 25 cm long. One leg of the same triangle is 7 cm long. What is the length of the other leg? Explain how you found your answer.

58. Statistics

I have a chart that has 4 columns across the top and 33 going down. The colunms on the top read: predicted number, selected number, (col 1 - col2)^2, and the mean of x. Their are 32 predicted numbers and 33 selected numbers. I need to fill in the column

59. Math

The sum of the degree measures of the angles of a quadrilateral is 360. Find the measure of the fourth angle of each quadrilateral given the degree measures of the other three angles. 4x+12, 8x - 10, 6x+5

60. Chemistry

When 320.62 grams of Bi2O3 react with excess of C, how many moles of Bi form? I know I need to use stoichiometry, but I can't quite seem to get the correct balanced equation.

61. Chemistry

a chemist runs a chemical reaction at 25 celsius and decides that it proceeds far too repedily. As a result he decides that the reaction rate must be decreased by a factor of 4. At what teperature should the chemist run the reaction to achieve this goal

62. Chemistry

a chemist runs a chemical reaction at 25 celsius and decides that it proceeds far too repedily. As a result he decides that the reaction rate must be decreased by a factor of 4. At what teperature should the chemist run the reaction to achieve this goal

63. psy201

which strategies you could use to strengthen the relationship and describe how the relationship would be strengthened.

64. government

What was the most common religious affiliation in the 108th Congress? Protestant Jewish Roman Catholic Non-religious

65. Physics

A spherical piece of metal has a radius of .250m and a mass of 503 kg. what is its specific gravity?

66. trig

Evaluate the expression cos 22 degrees and sec 22 degrees

67. Physics-Math

Suppose that a car starts from rest at position -3.31m and accelerates with a constant acceleration of 4.15m/s^2. At what time t is the velocity of the car 19.2m/s?

68. algebra

Sketch a graph of y=1/2int(x-2)+1. State the domain range and intercepts. Hint: Lightly graph y=int(x) and then apply three transformations.

69. finance

How do I mind out the value of this 5 oz, chunk of silver

70. systemic anatomy

what are the portions of stomach???

71. physics..

A physical quantity 'x'is calculated from the relation x=a^3b^2/ãcd. Calculate percentage error in x, if a, b, c and d are measured respectively with an error of 1%,3%,4% and 2%.

72. maths..

A is 20% greater than B.What percent is B smaller than A?

73. calculus

Demostrate that: d/dx [tan^-1(x)]= 1/1+ x^2 -> using implicit differentiation

74. maths

how does 2sin(a/2)cos(((m+1)/2)a) = sin(((m+2)/2)a) - sin ((ma)/2)?

75. Physics

A 3 kg block is being pulled by a string at a constant speed on a surface with a coefficient of kinetic friction of 0.3. If the string is at an angle of 30 degrees with the horizontal, what is the magnitude of the force necessary to pull the block?

76. Chemistry

If tests are worth 90% & quizzes 10%. What is my average is my test average is a 83 & my quiz average is a 92?

77. physical science

the speed of light is 3*10^8 m/s. Red light has a wavelength of 7 * 10^-7 m. What is its frequency?

78. algebra

solve using the eliminatin method. show your work. if the system has no solution or an infinite number of solutions,state this x+y=10 x-y=2

79. algebra

solve using the elimination method. show your work. if the system has no solution or an infinite number of solutions, state this x+y=10 x-y=2

80. Chemistry

When hot and concentrated, sulfuric acid is a fairly strong oxidizing agent. Write a balanced net ionic equation for the oxidation of metallic copper to Cu(II) ion by hot concentrated H2SO4, in which the sulfur is reduced to SO2.

81. 5 Pre-Calculus Questions

1. What is the value of x in the right triangle below? If needed, round your answer to two decimal places. 32 angle, 15 inches, find the x in base… 2. A 10-foot ladder is leaning up against the side of a building so that the top of the ladder reaches the

82. Statistics

I have a chart that has 4 columns across the top and 33 going down. The colunms on the top read: predicted number, selected number, (col 1 - col2)^2, and the mean of x. Their are 32 predicted numbers and 33 selected numbers. I need to fill in the column

83. physics

An 8 kg ball is moving at 4 m/s. Work is done on the ball to give it a speed of 12 m/s. What is the balls initial kinetic energy? What is the balls final kinetic energy? What work was done on the ball?

84. Education

How could you intervene to encourage further exploration of the materials based upon the children's spontaneous play?

85. differential equation

A mass 􀝉􀬵 􀵌 1 􀝇􀝃 is attached to a spring with a spring constant 􀝇􀬵 􀵌 5 􀯇 􀯠, which is attached to a solid mounting. A second mass 􀝉􀬶 􀵌 1 􀝇􀝃 is attached to a spring with spring constant 􀝇􀬶 􀵌 6 􀯇 􀯠,

86. Math

Evaluate. Express each result in scientific and standard notation. (5.62 x 10^-3) (16 x 10^-5) and 9.2 x 10^3 2.3 x 10^5

87. Marketing

Discuss the universal functions of marketing and those functions that would apply to the products/services provided by a fictitious firm of your choosing.

88. ethics

Are laws and regulation the problem or the solution in addressing ethical problems?

89. systemic anatomy

The duodenum is divided in to.......parts, In which the major duodenal papilla is the opening of.......??? please answer ASAP confused ! p.s. i know duodenum has four parts but don't know the second blank. help!!

90. English

I forgot to add the following statements. Thank you very much for your cooperation. 1) What did you like most among the various topics we dealt with during your school year? 2) Are you going to continue your study of English at university? 3) Are you going

91. integral calculus..

Evaluate the following integral:- çMvdv , with upper limit 'v' and lower limit 'u'

92. pre algebra

Each side of the triangle shown has the same length. If the perimeter of the triangle is 49 inches, the length of each side is 3 inches. true or false

93. history-Civil War

Upon retreating from Petersburg, were there any options open to Lee that might have prolonged the War? Please chech if my answer is correct... No, Lee retreated from Petersburg and attempted to link up with the remnants of Confed. Gen. Johnson's defeated

94. geometry

Given the triangle ABC and m

95. Math 117

Find all numbers for which the rational expression is undefined.6/2v+9

96. algebra

the greater of two consecutive integers is 20 more than twice the smaller. what are the integers

97. Soc

Advocates of the death penalty recognize that no system is perfect and that applying the death penalty runs a small risk of executing someone who is innocent. Is this a price society should be willing to pay?

98. life skills

name 3 things you like about you that makes you feel good about yourself

99. Easy Pre-calculus Questions?

What is the value of x in the right triangle below? If needed, round your answer to two decimal places. 32 angle, 15 inches. A 10-foot ladder is leaning up against the side of a building so that the top of the ladder reaches the top of the building. If the

100. laspinas school

find out what is the cosmetologist do skin care and electrology

101. English

Thank you very much. Where can I find exercises on the use of idioms, collocations and phrasal verbs? Here are some other corrections I'd like you to check. 1. To represent the unspoken activity of the mind twenty-century writers adopted the interior

102. Geometry

If AB=5x+2 and AC=12x-2, what is BC?

103. chem

two metals both at a temperature of 25 degrees celsius are placed in separate beakers. metal A has a larger specific heat than metal B. which beaker will exhibit a greater change in temperature

104. englishh

Can you help me with checking meter in my poem?

105. biochemistry

Why do you think the proximal and distal histidines are invariant between myoglobin, the alpha subunit and the beta subunit?

106. Math

At a carnival,10 tickets cost \$4. How much do 50 tickets cost?

107. Math

At a carnival,10 tickets cost \$4. How much do 50 tickets cost?

108. Marketing

Read Chapter 21 and provide a succinct overview of the key components of a marketing plan.

109. Marketing

Discuss the dimensions for segmenting markets

110. English

Thank you very much for your corrections! I just wanted to know if I should evaluate these collocations as mistakes. I included some of the corrections myself. 1) Women had to provide an education to children. (Correction: provide someone with...) 2)

111. maths

If the sum of the first 15 terms of an arthimetic sequence is 240. what is the 8th term

112. physics

A metal rod and a metal ball were submerged in a pot of water that is heated from 30°C to 80°C. At the bottom of the pot, one of the ends of the rod touches the ball. After heating the water, the ball moved. What is the final Velocity?

113. living environment

what is an ecology?

114. living environment

what is a biosphere?

115. geometry

A soccer ball has diameter of 400 mm. A pin is stuck into the ball such that it creates the chord AC, which is 20 mm. What is the distance from the chord formed by the pin, and what is the length of EB? (Hint: CD=radius)

116. Computer

Describe how an operating system that uses paging could make stacks grow dynamically if the original size proves too small. What would the page table data structures look like? Explain what would happen when a thread's stack grows past the area that has

117. math

Please Factorize it- 16x2+8x-1 Note="2 used after 16x is power of x"

120. american government

Write your own scenario of a case that would be tried in a court of original jurisdiction. Your example may be fictional, historical, or right from today’s headlines.

121. English

As you advised me to do, I included four sentences I was most doubtful a) 1) The daffodils grow best under the shine of trees (correction: in the shade, under the trees) 2) Time is perceived subjectively / as subjective (both possible). 3) Drunk men

122. statistics

using a simple random sampling, select a sample of 12 students out of a population of 30 students comprises of 20 females and 10 males.

123. English

In your previous post you wrote "time is perceived as subjective" so I won't evaluate it as a mistake. What do you think? I still have two more doubts. 1) The character's thougts flow freely without any temporal structures. (correction: .... freely in

124. Life orientation

In 10-15 lines critically discuss 5 ways in which the human or environmental problem on the community.provide relevant sources to support your claims.

125. geometry

What is the measure of angle 5 if p//q, angle 1 equals 40 degrees, and angle 2 equals 80 degrees?