# kris

Newest questions and responses by kris
1. ## Physics

Elastic behavior: when loads are small how much deformation occurs? What materials deform least?

2. ## Science

A pulley system shows is use to raise a load of 600N through 8m. If the effiency I 90%. Calculate a, machincal advantage b. Workdone by the effort c. Effort applied

3. ## math

carlos makes geometrical artworks out of sheet metal. the dimensions of a full size sculpture will be 6 times the dimensions of the model shown below. He will not use any metal for the bottom base of the cylinder. How many square feet of sheet metal will

4. ## Math

The only way to get to Ship Island is to take a boat, which is free for 2 and under, \$17 for children 3 to 10 years old, \$25 for seniors 62 and over and \$25 for everyone else. Debbie paid \$116 for 6 people in her family to go to the island for the day. Is

5. ## Math

A tiling company specializes in multi-colour tile patterns. A small hotel is interested in the patterns below for its square shaped reception area. How many dark coloured tiles will there be if the reception area needs an area of 18 x 18.

6. ## Physics

In a friendly neighborhood squirt gun contest a participant runs at 7.8 m/s horizontally off the back deck and fires her squirt gun in the plane of her motion but 45' above horizontal. The gun can shoot water at 11 m/s relative to the barrel, and she fires

7. ## Math

A computer is purchased at 2000\$. After each year, the resale value decreases by 25%. What will the resale value be after 3 years?

8. ## Algebra II

(3-4yi)(6+7i)-[(2-3yi)-3(1+7i)] Express it in a+bi form I got 19+42i-21yi+28y but I do not know how to express it in a+bi form, can you please help me with it?

9. ## Physics

A student says a speed of 50 m/s is faster than a speed of 140 km/h because the number is bigger. what would you say to them?

10. ## Stoichiometry

What mass of water is produced from 10g of sulfuric acid ?

11. ## math

A runner has a stride length of 5 feet for the first half of the race and a stride length of 4.5 feet for the second half. How many strides would it take to finish the second half of the marathon? Hint: 5 ft is 5.0 x 10 4.5 is 4.5 10

12. ## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

13. ## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

14. ## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

15. ## chemistry

What is the conjugate acid for NH2- ? N3- NH2- NH4+ H+ I thought it was NH4+ but it was wrong. Isn't it suppose to be NH3+ but they don't have on this choices.

16. ## Chem

Can you check to see if I'm correct? Which of these substances are elements? a. silicone b. quartz c. iodine d. water e. silicon f. lead is the answer: c, e, and f?

17. ## Chemistry

Hi! I am having some trouble with this question, can you please help me? Which of the following describe chemical properties? Check all that apply. - Iodine (a purple solid) becomes a purple gas. - Titanium is less dense that iron . - Water freezes at 0'C

18. ## engineering math

What is the increase in temperature necessary for a hydrogen gas, initially at 0°C, to increase its volume by 5% at constant pressure?

ms. sue the questions I need help with you answered o Jan 27, 2015 can you help me with the same questions? there are 20 of them. I saw them online.

20. ## Math - Help Me Please

Stereo Inc. sells a stereo system for \$300 down and monthly payments of \$40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

Stereo Inc. sells a stereo system for \$300 down and monthly payments of \$40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

22. ## Math - Help Please

Stereo Inc. sells a stereo system for \$300 down and monthly payments of \$40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

23. ## science

Calculate the concentration of all species in a 0.145M solution of H2CO3

24. ## Chemistry

Oil and water don't mix. We say that oil is

25. ## Chemistry

Name three properties of metal for which metallic bonds are responsible

26. ## math

3000 for 3 years at 1.8% compounded monthly

mrs. lens wants to put a ribbon around the edge of a pillow. which tool and unit should she use to measure the perimeter of the pillow? measuring tape or ruler or yard stick?

28. ## Calculus II

Find the indefinite integral. ∫xe^-4xdx

29. ## Science

A sample of steam with a mass of 0.530g and at a temperature of 100 ∘C condenses into an insulated container holding 4.40g of water at 5.0∘C.( ΔH∘vap=40.7 kJ/mol, Cwater=4.18 J/g⋅∘C). What is the final temperature of the mixture, assuming no

30. ## maths

I am fraction they say i m nt proper i may be improper but when u solve me u get number seven my number is 21.wht fraction am i?

31. ## physics

A helicopter flies south at 185km/hr relative to the ground. The wind is blowing 60km/hr to the west compared to the ground. What is the helicopter's speed to an observer on the ground?

32. ## Math

Ken planted 8 flowers and 4 shrubs in his mother's garden. He ran out of fertilizer before he planted 2 of the flowers and 1 of the shrubs, so he planted them without fertilizer. What percentage of plants were planted without fertilizer? A. 12.5% B.25% C.

33. ## physics

A student fires a rocket at 24 degrees above the horizontal. The 10kg rocket comes out of the gun barrel at 1000 m/s, and accelerates 15 m/s^2 uniformly until it burns out 2 seconds later. It then is acted apon by gravity until it hits the ground. I need

34. ## Chemistry (urgent)

1.Using Nerst, find the E of the cell for the dicromate redox system: A.under standard conditions. B.under neutral solutions instead of acid solutions. 2.Use Nerst and the hydrogen half equation to obtain an expression for pH.

35. ## Chemistry

1.Using Nerst, find the E of the cell for the dicromate redox system: A.under standard conditions. B.under neutral solutions instead of acid solutions. 2.Use Nerst and the hydrogen half equation to obtain an expression for pH.

36. ## math

How many packs of DVDs can you buy with 198 dollars if one pack costs 18 dollars

37. ## Chemistry (urgent)

Hydrolysis of a compound A, C7H6cl2 was carried out by refluxing with excess potassium hydroxide solution. the resulting solution was acidified with dilute HNO3 acid and excess silver nitrate was added to precipitate the chloride ions as silver chloride.

38. ## algebra

This isosceles triangle has two sides of equal length, a, that are longer than the length of the base, b. The perimeter of the triangle is 15.7 centimeters. The equation 2a + b = 15.7 can be used to find the side lengths. If one of the longer sides is 6.3

3 3/5 * 5/6 = 90/45 Do I have correct answer?

Multiply. Write each product in simplest form. 1. 2 3/8 * 1 3/5 = 3 4/5 2. 1 5/6 * 2/3 = 11/10 3. 7/8 * 3 1/3 = 35/27 Do I have the correct answers? If not can someone show how to solve them?

Multiply. Write each product in simplest form. 1. 2 3/8 * 1 3/5 = 3 4/5 2. 1 1/5 * 3/5 = 18/25 3. 1 5/6 * 2/3 = 11/10 Do I have the correct answers? If not can someone show me how to solve them?

42. ## Math

What is the sum of all the positive numbers smaller than 100,000 where all digits can only be 1 or 0.

43. ## chemistry 12

a chemical reaction released 50.0kJ of energy as it heated a sample of water from 17.0 degrees celsius to 75.0 degrees Celsius, what mass of water was heated? I have no clue as to how to do this! can anyone help?

44. ## chemistry

How many grams of glycolic acid are needed to react with 30 mL of 0.1 M NaOH?

45. ## math

is 100 over 1000 10%?

46. ## Math

Solve: -23m-(-35m)= -48

47. ## math

Justin is 10 years less than half his father's age. If Justin is 12 years old, how old is his father?

48. ## Calc Help :(((((

Solve it step by step so I can't do the rest. lim x->-infinity (ax^2+b)/(cx+d) Thank you! Answer th

49. ## Calc Help :(((((

Solve it step by step so I can't do the rest. lim x->-infinity (ax^2+b)/(cx+d) Thank you!

50. ## statistics

Use a table of t-values to estimate the P-value for the specified one-mean t-test. Left-tailed test, n=12, t= -3.412. a=p0.005. c= 0.005

51. ## Angle of elevation

A rocket fired straight up is tracked by an observer on the ground a mile away. a)Show that when the angle of elevation is theta, the height of the rocket in feet is h=5280tan(theta).

52. ## Angle of elevation

John stands at 12 feet from the foot of a tree. The angle of elevation to the top of the tree is 60°. What is the height of the tree?

53. ## health

What physical symptoms often accompany social phobia? A. Difficulty talking B. Trembling C. Nausea D. All of the above

54. ## Math

What is the number of different squares which can be inscribed in a given equilateral triangle?

55. ## math

A recipe for cooking a turkey states to allow 15 minutes for each pound of turkey and to add 5 minutes per pound if the turkey is stuffed. Our turkey weights 18 pounds and will be stuffed. It takes half an hour for the turkey to cool. What time should the

56. ## economics

What is the opportunuity cost if you make 15 a hour but you decide not to work for a 1 hour and go to the movie which cost 10 what is the opportunity cost?

57. ## chem

A 1L flask is filled with 1.25 g of argon at 25 degrees celcium. A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm. What is the partial pressure of argon in the flask? Chemistry - DrBob222, Tuesday, October 5, 2010 at

58. ## Calculus

(cos πx + sin πy)4 = 54; Implicit Differentation

59. ## Math

Casper bought some pencils at \$.50 each. He had \$3 left after the purchase. If he wanted to buy the same number of note pads at \$.80 each, he would be short \$1.50. Write a linear equation for the number of pencils he purchased. Then solve it.

60. ## math

a local summer baseball team plays 20 games each season. so far, they have won 9 games and lost 2. how many more games must they play win this season to win at least 75% of all their games?

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

62. ## Chemistry help needed

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

63. ## Chemistry

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

64. ## Chemistry

How man moles of sodium phosphate are there in 0.4 liters of 0.1M Na2HPO4 (MW=141.96 g/mol)? 2.) How many millimoles in 200 ml?

65. ## Physics

I am confused, selenium Se, is on the periodic table, but does it combine with other elements on the periodic table? I want to say no because it is a gas. Is that correct.

66. ## math - geometry

Austin wants to sketch the graph of a circle represented by the given equation. (x - 4)2 + (y + 7)2 = 64 Using complete sentences, describe the steps used to sketch the circle on a coordinate grid

67. ## ap chemistry

BaO2(s) + 2 HCl(aq) H2O2(aq) + BaCl2(aq) What amount of hydrogen peroxide should result when 1.00 g of barium peroxide is treated with 15 mL of hydrochloric acid solution containing 0.0330 g of HCl per mL? So confused... >.

68. ## CHEMISTRY

Bacterial digestion is an economical method of sewage treatment. 5CO2(g) + 55NH4+(aq) + 76O2(g) right arrow Bacteria C5H7O2N(s) + 54NO2-(aq) + 52H2O(l) + 109H+(aq) bacterial tissue The above reaction is an intermediate step in the conversion of the

69. ## chemistry

Nitric acid is produced commercially by the Ostwald process, represented by the following equations. 4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g) 2 NO(g) + O2(g) 2 NO2(g) 3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) What mass in kg of NH3 must be used to produce 4.4

70. ## AP CHEMISTRY

Commercial brass, an alloy of Zn and Cu, reacts with hydrochloric acid as follows. Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g) (Cu does not react with HCl.) When 0.5093 g of a certain brass alloy is reacted with excess HCl, 0.0953 g ZnCl2 is eventually isolated.

71. ## ap chemistry

Consider the following unbalanced reaction. P4(s) + F2(g) PF3(g) How many grams of F2 are needed to produce 212 g of PF3 if the reaction has a 79.8% yield? I did 212/.798=265.66 grams do I convert that to moles next?

72. ## chemistry

Consider the following unbalanced reaction. P4(s) + F2(g) PF3(g) How many grams of F2 are needed to produce 212 g of PF3 if the reaction has a 79.8% yield?

73. ## chemistry

What mass in kg of NH3 must be used to produce 4.4 multiplied by 106 kg HNO3 by the Ostwald process, assuming 100% yield in each reaction?

74. ## chemistry

What mass in kg of NH3 must be used to produce 4.4 multiplied by 106 kg HNO3 by the Ostwald process, assuming 100% yield in each reaction?

75. ## chemistry

You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 800 grams. The total mass of the set-up is 1000 grams. The chemical is ignited by means of a magnifying glass

76. ## math

Q1: If K=In a -In b +In c -t/bc,show that K=(ac/b)e^(-t/bc). Q2:Express log(8)5 in terms of m ,where m=lg 2 Q3:Given that log (4)3 =a and log(4)5 =b ,express log(75)16 in terms of a and/or b . really don't know how to do these qns..please help ! thanks a

77. ## math

express y=0.1(1000)^x in the form lg y =mx+c ,where m and c are constants ,and x is a function of x . Determine the constants m and c and the function x .

78. ## math

evaluate without using a calculator [log(5)4 x log(2)10 ]/ [log(25)√10]

79. ## Chemistry

List in increasing order of expected Rf values in a TLC experiment: salicylic acid, toluene, and benzophenone.

80. ## Chemistry!!!

1.)The silica that makes up the stationary phase in TLC chromatophraphy is more polar than the mobile phase. What then might the relative positions of the analgesics on the developed TLC plate tell you about the polarity of these molecules? Does this match

81. ## math

Sams shoes makes a profit of 38\$ on every pair of athletic shoes it sells. How many pairs of shoes must Sam sell to earn a profit of 950?

82. ## chemistry

Zn(s) + 2AgNO3(aq) = 2Ag(s) + Zn(NO3)2 (aq) It would require_____g of zinc to produce 5.40g of silver.

83. ## english

i need help with my ode poem about mom

84. ## math

a 5700 year old bone has 10 c14 atoms. how much c 14 did it have originally?

85. ## math

The quotient of p and 5.

86. ## chem

Given an aqueous solution in which the [H+] = 2.5EE-7 M, what is the molar hydroxide ion concentration

87. ## Calculus

A right circular cone has a constant slant height of 12 feet. Find the radius of the base for which the cone has maximum value

88. ## Math

On a map John is standing at (11,11). His friend Lucy is standing at (1,11). John took 10 steps to the right. Is he standing with Lucy now?

89. ## Algebra

2 questions I need some help with please! 1. Find the partial sum S5. an= -2n+16 2.Solve the system by triangularizing the augmented matrix and using bakc substitution. 7x=y-6 3y= -5-2x

90. ## Algebra

I need some help! Determine whether infinite geometric series has a finite sum. If so, find the limiting value. 112+56+28+....

91. ## Algebra

I need some help! Determine whether infinite geometric series has a finite sum. If so, find the limiting value. 112+56+28+....

92. ## Literature

In I Am Nujood, The urban elites Nujood encounters in the courtroom and at the Yemen Times lead very different lives from those of Nujood and the country people of Yemen. How are these “enlightened” people actually disconnected from the rest of their

93. ## Literature

In I Am Nujood, what enables Shada to take up Nujood’s cause so quickly and effectively? How does Shada, whom Nujood calls her “second mother,” open up Nujood’s world? Who else teaches Nujood about what a “real” family can be like?

94. ## Literature

In I Am Nujood, Nujood says that when her family was driven from Khardji, they lost “a small corner of paradise.” How do the injustices endured by Nujood’s father and brother, Fares, show that life in a patriarchal society can be hard not just for

95. ## Math

I need some help. A biologist finds that the population of a certian type of bacteria double seach half-hour. An initial culture has 60 bacteria. 1. What is the population after 3 hours? 2. How long will it take for the number of bacteria to reach 983,040?

96. ## Algebra Recursive sequence help

I need some help as I'm totally lost! I need to find the first five terms of each recursive sequence. The n-1 on the problem shows it below the a. 1. A1=3 An=2a n-1- 3 2. C1=64, C2=32 Cn= Cn-2 - Cn-1/2

97. ## Algebra Multiple Choice help!!

I need help with these! I got B for 1. C for 2. and D for 3. Thanks for the help! 1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.)

98. ## Algebra Multiple choice!!! Help

1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.) –8R1 +R2 -> =R2 d.) 8R1-R2 -> =R2 2.) Solve the system by triangularizing the

99. ## Algebra Multiple choice revised!! HELP

I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give