1. College Physics

Can someone check my answers for two and help me with the third? 1) A mass m at the end of a spring of spring constant k is undergoing simple harmonic oscillations with amplitude A. Part (a) At what positive value of displacement x in terms of A is the

2. Math

During exercise, the recommended maximum heart rate in beats per minute is modeled by the formula M=176-0.8A, where M is the maximum heart rate and A is the person’s age. Approximately, at what age would you have a recommended heart rate in beats per

3. Math

1.Which explains why the sequence 216, 12, 2/3 is arithmetic or geometric? A.The sequence is geometric because it decreases by a factor of 6. B.The sequence is arithmetic because it decreases by a factor of 6 C.The sequence is geometric because it

4. Chemistry

How do you calculate ΔSfus and ΔSvap for HCl given melting point,ΔHfus, boiling point, and ΔHvap also how do you determine the entropy change when 5.20 mol of HCl(l) freezes at atmospheric pressure.

5. Physics

When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4 x 109 N/m2, tensile Young's modulus 1.6 x 1010 N/m2) decreases by 1.5 x 10-5 m. When this same bone is subjected to a tensile force of the same magnitude, by

6. Physics

Light of wavelength 630 nm is incident on a long, narrow slit. a)Determine the angular deflection of the first diffraction minimum if the slit width is 0.020 mm. b)Determine the angular deflection of the first diffraction minimum if the slit width is 0.20

7. Help me solve??

XYZ has vertices X(5,6), Y(9,12), and Z(12,8). it is translated right 8 units and up 3 units. What are the coordinates of X', Y', and Z' ?

8. Math

LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months. As part of its testing program, LongLast

9. Physics 194

Light of wavelength 630 nm passes through a grating and then onto a screen located several meters from the grating. The 1st order bright band is located 0.26m from the central maximum. Light from a second source produces a band 0.21m from the central

10. math

a person was climbing on a building. He slips 1 m for every 5 metre he climbs up. If the building is 53 m high and he takes 5 seconds to climb 1 metre find the total time taken by him to get on the top of the building.

11. History

2) which statement best describes a social contract A.an implied agreement between citizens and government in which citizens release some liberty to government for the good of society B.a contract between local residents and providers of basic services

12. !math (6)

The quantity demanded x (in units of a hundred) of the Mikado miniature cameras per week is related to the unit price p (in dollars) by p = −0.2x^2 + 220 and the quantity x (in units of a hundred) that the supplier is willing to make available in the

13. Chemistry

What is the chemical reaction between these chemicals? NH4Cl + Na2SO3 NH4Cl + NaOH Na2SO3 + BaCl2 Na2SO3 + NaOH H2SO4 + BaCl2 BaCl2 + NaOH

14. !math (4)

The demand function for a certain brand of CD is given by p = −0.01x^2 − 0.2x + 12 where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. The supply function is given by p = 0.01x^2 + 0.5x + 3

15. calculus help

Farmer Brown wants to fence in a rectangular plot in a large field, using a straight rock wall that is already there as the north boundary. The fencing for the east and west sides of the plot will cost \$3 a yard, but she needs to use special fencing, which

16. Spanish

Sra, Are my answers correct? Thank you. Complete the following sentences using the subjunctive 1. Dudamos que ellos… Dudamos que ellos vengan a la fiesta. 2. Es imposible que ella... Es imposible que ella llegue aquí a tiempo. 3. Es importante que

17. Chemistry

The following equation represents the decomposition of a generic diatomic element in its standard state. (1/2)X2(g)--->X(g) Assume that the standard molar Gibbs energy of formation of X(g) is 5.45 kJ·mol–1 at 2000. K and –64.30 kJ·mol–1 at 3000. K.

18. math

two cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. find the probability of the given event. a. two cards of the same suit are drawn. b. a pair is not drawn.

19. Astronomy

A roughly spherical asteroid with a diameter of 1 km, and a mean density of 4 g/cm^3, hits the Earth with a relative speed 1.5 times the orbital velocity of the Earth. Compute the amount of energy released upon the impact. Compare that with the energy

20. algebria

Suppose the population of deer in a state is 10,280 and is growing 1% each year. Predict the population after 5 years

21. !math (2)

The demand function for a certain brand of CD is given by p = −0.01x^2 − 0.2x + 10 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers' surplus if the market

22. Math

Find the value of the variables in the table: X= n, 4, 6, 10, 12. Y= 1, 9, m, 21, 25 n=0 Y=11?

23. !math (1)

The demand function for a certain make of replacement cartridges for a water purifier is given by the following equation where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. p = -0.01x^2 - 0.1 x +

24. Algebra

The equation r = (sqrt A)/(pi) gives the radius r of circle with area A. What is the radius of a circle with the given area? Write your answer as a simplified radical and as a decimal rounded to the nearest hundredth. a. 50 ft^2

25. physics

A spring (k = 905 N/m) is hanging from the ceiling of an elevator, and a 4.8-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.74 m/s2?

26. soc

A graduate student at Big State University has begun data collection for a thesis project in which she is asking students about their use of social networking websites. Her primary interest is in determining how often students use these sites, in what

1. If 23.00 grams of carbon dioxide and 18.75 grams of water are formed from the combustion reaction. What is the percent yield for CO2 and H20. How much in grams of the excess reactant remains? 2. Balance the equation and determine the mass in grams of

28. SOCIAL STUDIES HELP PLEASE?! c:

1) ___________ make up the majority of the population in Guatemala. Spaniards Incas Mexicans Native Americans 2. One challenge that makes it hard for the Mayas to retain their land is that they are more likely to think of themselves as ______ than _______.

29. Permutations

1. 4! a.) 3 b.) 6 c.) 12 d.) 24****** 2. 5! a.) 25******** b.) 120 c.) 250 d.) 625 5. Five friends are having their picture taken. How many ways can the photographer arrange the friends in a row? a.) 150 b.) 100 c.) 120******* d.) 80 6. How would you apply

30. science

what is the force that results from a 3,000 kg car accelerating at 20.00 m/s squared?

31. History8

Which of the following was not a contributing factor in Southern surrender _______________. a.massive casualties in the Southern ranks b.a change in the beliefs, lack of purpose, and lowered morale c.the capture of Jefferson Davis by the Union d.ruined

32. Chemistry

I am trying to complete a lab called Precipitation Titration of Cobalt Chloride. I've done the experiment and I got that if you combine 18.01mL of 0.1M NaOH with 10mL of CoCl2, the precipitate is forms. Now how do I calculate the concentration of the

33. math

The table below shows the results of an experiment in which a number cube was tossed 20 times. Outcome of toss: 1 2 3 4 5 6 Number of times Outcome Occurred: 4 1 5 5 2 3 (table reads: outcome of toss 1=4number of times,2=1,3=5,4=5,5=2,and6=3) Based on

34. physics

When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4 x 109 N/m2, tensile Young's modulus 1.6 x 1010 N/m2) decreases by 1.5 x 10-5 m. When this same bone is subjected to a tensile force of the same magnitude, by

35. Math7

Which ordered pair is not a solution of y = 4x -9 (-9, 27) (3, -21) (-6, 15)I think this one? (5, -28)

36. Physics

Two Train whistles, A and B each have a frequency of 408Hz. A is stationary and B is moving toward the right (away from A) at a speed of 35.0m/s. A listener is between the two whistles and is moving toward the right at a speed of 15.0m/s. What is the

37. physics

A projectile is launched vertically from the surface of the Moon with an initial speed of 1210 m/s. At what altitude is the projectile's speed two-fifths its initial value?

38. Science

which of the following body systems does not rely on the autonomic nerve system to stimulate involuntary events?

39. !math (5)

The management of the Titan Tire Company has determined that the quantity demanded x of their Super Titan tires/week is related to the unit price p by the relation p = 160 − x^2 where p is measured in dollars and x is measured in units of a thousand.

Find the area of the region. 2y=3sqrtx, y=5 and 2y+2x=5 ty

41. math

an unbiased coin is tossed six times. find the probability of the given event - the coin lands heads more than once.

42. math (9)

Find the area of the region enclosed by these graphs and the vertical lines x = 0 and x = 3 f(x)=-x^2+2x+4 g(x)=-x+4

43. math

8. the net price of an item listed for RM1500 after deducting a trade discount of 20%, 15% and X% is RM969. FIND X

44. !math (3)

A supplier of portable hair dryers will make x hundred units of hair dryers available in the market when the unit price is p = sqrt(324 + 4x) dollars. Determine the producers' surplus if the market price is set at \$22/unit. (Round your answer to two

45. Physics

In one dimension, a 12 kg ball moving to the right at 9 m/s collides with a 4kg ball moving to the left at 3 m/s. The collision is perfectly elastic. Find the final velocities of both balls.

46. GEO 111

Which of the following in NOT an impact of the oil economy in this realm? a. outmigration from the realm b. infrastructure development c. foreign investment and involvement d. an increase in regional disparities

47. chemistry

It takes 10 workers to produce 39 parts in a month in that same time a machine can take 6 parts and produce 1 products which sell for \$100 each. If you want to make \$1000 worth of sells, how many workers are needed?

48. Math

How must unit cubes be stacked when used to measure volume?

49. Chemestry

Approximately how many mL of 5% BaCl22H2O solution would be required to precipitate all the sulfate if we assume that your samples are pure sodium sulfate? Assume that the density of the barium chloride solution is 1.00 g/mL

Consider the area between the graphs x+2y=9 and x+6=y^2. This area can be computed in two different ways using integrals First of all it can be computed as a sum of two integrals as integral f(x)dx from a,b + integral g(x)dx from b,c I got a=-6 b=3 c=19

51. Calculus

How fast must you release the string of your kite if the kite that you are flying is 40 meters high, 50 meters away from you and moving horizontally away at rate of 30 meters per minute?

52. calculus help

A drinking cup is made in the shape of a right circular cylinder. for a fixed volume, we wish to make the total material used, the circular bottom and the cylindrical side, as small as possible. Find the ratio of the height to the diameter that minimizes

53. Algebra

what is the excluded value of the function? y = 4/(9x – 45) • –5 • 0.2 • 5 • –0.2

54. math

RM65000 will be invested for 6 years 9 months. if the investment will be offered 5% compounded semi annualy for the first 2 years, 6% compounded monthly for the next 18 months and 7% compounded daily for the rest of the period ,find the future value of

55. Math

(16a)/(sqrt 6a^3)

56. letter

How can I write a feel better letter to Miley Cyrus? please help and give me so examples please help HOPE YOU FEEL BETTER [DateDear Miley cyrus I was quite upset to hear that you are feeling ill. However, I am every certain about you and i hope you will

57. Social Studies/History

Social Studies/History was just never my subject .. But, I was wondering If any of you people on here would be kind enough to help me, I would appreciate it! :/ Please & Thank you!? #^CountryGirl!

58. Math

Solve the equation and write the answer in simplified radical form. n^2 - 2n + 1 = 5

59. chemistry

What volume of ethanol must be diluted with water to prepare 315 mL of 0.620 M solution? The density of ethanol is given as 0.789 g/mL. Answer in units of mL

60. sociology

Professor Winston is explaining to his class that people who watch more hours of violent television programming also show greater levels of hostility and violence toward others. He continues to say that this means violence on television causes increased

61. math

A printer has two font sizes. Large font is 1800 words per page. Small font is 2400 words per page. If allotted 21 pages, then how many pages must be in smaller font size?

On May 1, Emerson Fast bought 10 Manitoba On May 1, Emerson Fast bought 10 Manitoba Polar bonds with a coupon rate of 7.875%. The purchase price was \$101. 375, and the commission was \$8 per bond. Manitoba Polar bonds pay interest on April 1 and October 1.

63. chemistry urgent!

what is the net ionic for these following balanced equations: 2(NH4)3PO4(aq) + 3Ba(OH)2(aq) -> Ba(PO4)2(s) + 6H2O(l) + 6NH3(g) 2HNO3(aq) + K2CO3(aq) -> H2O(l) + CO2(g) +2KNO3 NaF(aq) + HCl(aq) -> NaCl(aq) + HF(aq)

64. math

Company ABC offers a series discount of 20%,10% and 4% on a type of water filter while company XYZ offers a single discount of 32% on the same type of water filter. Which company offers a greater discount on its merchandise assuming the list price is the

65. MATH STATS URGENT

The Houston Rockets and San Antonio Spurs will play a "best two out of three" series. Assume that Houston has a probability of 1/3 of winning any game. a. Draw a probability tree showing possible outcomes of the series. Label the branches with appropriate

66. calculus help

At time t=0, an astronaut stands on a platform 3 meters above the moon's surface and throws a rock directly upward with an initial velocity of 32 m/sec. if the acceleration due to gravity is 1.6 m/sec^2. a) find the equations of motion for the throwing of

67. Office Finances

What must a depositor add to check before the bank will accept it for deposit?

68. Chemistry

At 25 °C, the equilibrium partial pressures for the following reaction were found to be PA = 4.10 bar, PB = 5.60 bar, PC = 1.20 bar, and PD = 9.70 bar. 2A(g)+2B(g)-->C(g)+ 3D(g) What is the standard change in Gibbs free energy of this reaction at 25 °C.

69. statistics

Which of the following statements is correct? A. An extremely small p-value indicates that the actual data differs markedly from that expected if the null hypothesis were true. B. A large p-value indicates that the data is consistent with the alternative

70. ap statistics

The manager at Air Cargo feels that the weights of packages shipped recently are less than in the past. Records show that in the past packages have had a mean weight of 36.7 lb. and a variance of 201.64 lb2. A random sample of last months shipping yielded

71. Geometery help"Steve"

The point Q(x,y) is reflected in the origin. Use arrow notation to describe the original point and its reflection. I chose this: (x,y) to (x,y) Am I right?

72. calculus help

for f(x)= ln(x-3) on the interval [5,9], find c so that f'(c)= (f(b)-f(a))/(b-a)

73. English

I'm dong project on Dyncorp/CSE( Have to Give a brief description of the corporation- The human right violations it supports that makes this a social justice issue. Who profits and who pays etc)-Any action that can be taken to help prevent these human

74. math

8. the net price of an item listed for RM1500 after deducting a trade discount of 20%, 15% and X% is RM969. FIND X

75. math

Company ABC offers a series discount of 20%,10% and 4% on a type of water filter while company XYZ offers a single discount of 32% on the same type of water filter. Which company offers a greater discount on its merchandise assuming the list price is the

If 15ml of 1M sulfuric acid is used until faint pink endpoint is reached how many moles of magnesium hydroxide are in 50ml solution. Please help

I am ashamed to say it, but we need a... how do i change this so its not in passive

78. physics

Compute your mass in kilograms (1 pound has a mass of 0.45 kg on Earth) and then your weight in Newton’s for the earth, moon, and several planets. Where are you heaviest?

79. Chem

Using the standardized NaOH solution, the student weighs out 0.2550g of a solid unknown acid and finds that 28.50mL of the NaOH solution is required to reach an end point with the acid. Calculate the molar mass of the unknown acid, assuming the acid is

80. math

If you inherited \$ 45,000 today and invested all of it in a security that paid a 7 percent rate of return, how much would you have in 25 years?

81. Physics

In one dimension, a 5g ball is moving to the right at 7 m/s collides with an 8g ball moving to the left at 4 m/s for a perfectly elastic collision. What is the final velocity of both balls? I just don't understand the whole left and right thing. I have

82. Chem

Using the standardized NaOH solution, the student weighs out 0.2550g of a solid unknown acid and finds that 28.50mL of the NaOH solution is required to reach an end point with the acid. Calculate the molar mass of the unknown acid, assuming the acid is

83. math

Which of the following relations is not a function? (8, 4), (-5, 2), (4, 1), (-6, 2) (-5, 4), (4, 2), (8, 1), (-6, 5) (-6, 4), (4, 3), (-5, 1), (8, 2) (4, 4), (-5, 2), (4, 1), (-6, 2) my answer is b

84. american history

For revolutionaries like sam adams. the term embraced a way of life a core ideology and an uncompromising commitmentto liberty and equality

85. algebra

I have try this three different way and still can not come up with the correct answer, could you guide me the right way. suppose that a spreadsheet contains the following values, A6, B-4, C2, D3 it said to determine the value of cell E1 if it contains the

86. Biostatistics

I need help with missing data. Does anybody know a good website that helps with missing data and the methods used to put in missing data?

87. Chemistry

A reaction has a standard free-energy change of –4.60 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively?

88. trignometry

Tan4x=4tanx(1-tan^x)/1-6tan^x+tan^^x ,prove

integral t^2dt from x to x^2 f'(x)=?

90. algebra

given that sin (2x+30)=cos(x-15).determine the value of x given x is an acute angle

91. physics

Why can astronauts jump higher on the surface of the moon than on the surface of the earth? Is it because their legs are stronger? Has the amount of "body matter," i.e., "mass" changed? Do they weigh less on the moon than on earth? Why

92. ap statistics

A fire insurance company felt that the mean distance from a home to the nearest fire department in a suburb of Chicago was at least 4.7 miles. It set its fire insurance rates accordingly. Members of the community set out to show that the mean distance was

93. math (4)

Sketch the graph (Do this on paper. Your teacher may ask you to turn in this graph.) and find the area of the region bounded below by the graph of the function and above by the x axis from x = 0 to x = 1. f(x) = -xe^(-x^2)

94. math

Frank calculated that he will lose 4.6 calories per minute walking at a rate of 3 miles per hour. How many minutes does he need to walk to burn at least 250 calories? Write and solve an inequality, rounding to the nearest tenth

95. Chemistry

HELP!! I'm doing an experiment to do with phosphorus and plant food and MgNH4P04 6H20 my air dry weight of MgNH4P04 6H20 was 1.31 g grams of P in plant food was .165 g % P in plant food is 13.87% % P205 equivalent to % P above is 63.02% % P 205 in 10-52-10

96. Geometery help

The vertices are (4,5),(9,10),(9,5) what are the coordinates of the the fourth vertex? (5,10) ?

The quarterback throws a pass from 10 yards from a goal line and 25 yards from a sideline. A receiver catches the pass at 40 yards from the same goal line and 5 yards from the same sideline. How long was the pass?

98. mathematics for management

1.FIND the bank discount and proceeds on the following loans i) RM4000 FOR 3 MONTHS at 10 1/2 percent ii) RM4215 FROM 10 june to 5 august of the same year at 10 percent

99. American

Who was The person who supposedly recorded the speech of Chief Seattle?

100. Introduction to American Literature

One of Hawthorne’s main themes is

101. Algebra

5670 compounded annually at a 3.5 interest rate once a year yields what in interest

102. Chemistry

You added how may mols NaOH? That's M x L = mols. What final volume do you have. You added 18.01 mL and 10 mL so total volume is 28.01 mL. Convert that to L., then M = mols/L Do I do 0.1M x .01801L = 0.001801mols? Then do M = 0.001801mols/0.02801L? I'm a

103. chemistry

If 3.00 moles of NaCl were mixed with 0.2 L of 1.5 M of AgNO3, how many moles of solid would form? Include the formula for the solid.

104. science

a 2,500 kg car at 15 m/s squared, 15 m/s squared is the what of the car?

105. Algebra 1 (Reiny)

Find the roots of each quadratic polynomial. 1. x^2 + 2 2. x^2 - 6x - 7

106. math

f (x) = (50-w) (75-w)?

107. Algebra

y = (4)/(9x – 45) • –5 • 0.2 • 5 • –0.2

108. health sciences

Explain the changes that occur in the DNA of muscle fibers during exercise?

109. science

When 4.56 g of a nonelectrolyte solute is dissolved in water to make 275 mL of solution at 22 °C, the solution exerts an osmotic pressure of 873 torr.

110. Coordinates Math"Steve"

Is the proportional? x: 1 3 4 6 y: -4 -12 -16 -24 I think it is. Am I correct?

111. Math

Simplify M^3 n^6 / m^4 n^4 p^-2

112. Locus- Calculus

Find the equation of the locus of the point representing z if |z-5-12i| + |z-5+21i|=13

Evaluate the integral by using substitution. Use an upper-case "C" for the constant of integration. integral x^5((x^6-2)^10)dx ty

114. maths

if average of m nimbers is n^2 and average of n numbers is m^2 then find average of m+n numbers

115. math

Paula is an office manager for ABC Advertising. She has been tasked with finding a copy machine that falls within a budget of \$750 per month. She finds a company that will lease the machine for \$275 a month. Each copy costs 4¢ and a ream of 500 sheets of

116. ap statistics

What is the mean of the sample means? What is the standard deviation of the sample means?

117. algebra

Suppose that a box has a base with a width of x, a length of x+3, and a height of 1 inch. It is cut from a square sheet of material with an area of 130 in2. Find the dimensions of the box.

118. Chemistry

What is the final concentration if 27.08 (MW: 36.46) dissolved in 55.51 ml?

119. environmental science

What are some of The Blue Plains Water Advanced Wastewater Treatment Plant standards of

120. Finance

24X=260×{1.05^x/2 what' the number of X

121. Math (6)

Find the area of the following two curves. y= sqrt(x) y= x-2

(0,0); m=2

123. math (2)

Find the area of the shaded region y= 2x/(x^2+4) from x= -1 and x= 1

124. College Chemistry

If 3.00 moles of NaCl were mixed with 0.9 L of 0.5 M of AgNO3, how many moles of solid would form? Include the formula for the solid.

125. Algebra 1

When graphing quadratic equations, do you include the y-intercept on the graph?

126. Algebra 1 (Reiny)

Find the roots of each quadratic polynomial. 1. x^2 + 2 2. x^2 - 6x - 7

127. Physics

A 25000kg bowling ball moving at 40 m/!@#\$%^&s a 10000kg bowling ball moving at 25 m/s from behind. It is a perfectly elastic collision, so what are the final velocities of the two balls?

128. Physics

Your teenage kid finally gets his drivers license. He takes off in your brand new car that weighs 2000kg at 47m/s when he hits a parked semi that weighs 40000kg. They plow forward in a perfectly in elastic fashion in the same direction. What is the

129. math

represent an equivalent fraction to 3/4 as 1)a fraction and 2)a picture