# Holly

Popular questions and responses by Holly
1. ## Physics

A mechanic uses a chain and block to lift a 875-kg engine 4.00 m to the top of the garage. The downward force in the chain over the 4.00 m distance is 5.00 x 10^4 N. A) Calculate the work done in raising the motor B) How much useful work was done? C) What

2. ## chemistry

A sample of O2 gas is collected over water at 23C at a barometric pressure of 751 mmHg (vapor pressure of water at 23C is 21 mmHg). The partial pressure of O2 gas in the sample collected is: (a) 21 mmHg (b) 751 mm Hg (c) 0.96 atm; or (d) 1.02 atm The

3. ## geometry

What is the value of x to the nearest tenth? The figure is not drawn to scale. (1 point) x = 2.1 x = 3.4 x = 9.6*** x = 13.1

4. ## Chem 101

In a fission reaction, uranium-235 bombarded with a neutron produces strontium-94, another small nucleus, and 3 neutrons. Write the nuclear equation for this reaction.

5. ## Pre-calculus help

I have two problems I am stuck on, if you could show me how to solve the problems it would be much appreciated. 1) Find sin 2x, cos 2x, and tan 2x from the given information. tan x = − 1/6, cos x > 0 sin 2x = cos 2x = tan 2x = 2) Find sin 2x, cos 2x, and

6. ## Chemistry

What is the oxidation number for each atom in NH4F? N=+3, H=-4, F=+1 N=-3, H=+1, F=-1*** N=+3, H+1, F=-1 N=-3, H=-1, F=+1

7. ## Chemistry

A solution contains 25 mmol of H3PO4 and 10. mmol of NaH2PO4. What volume of 2.0 M NaOH must be added to reach the second equivalence point of the titration of the H3PO4 with NaOH?

8. ## statistics

A study of 35 professors showed that the average time they spent creating test questions was 13.5 minutes per question. The standard deviation of the population is 3.8. Which of the following is the 99% confidence interval for the average number of minutes

9. ## geometry

Are the polygons similar? If they are, write a similarity statement and give the scale factor. The figures are not drawn to scale ABCD ~ KLMN; 7.2:1.8 ABCD ~ KLMN; 3:1.8 ABCD ~ NKLM; 3:5.4 The polygons are not similar***

10. ## Chemistry

Barium carbonate and nitric acid reacts in a double displacement reaction. One of products also dissociates and evolves carbon dioxide. Write the net ionic reaction including the proper use of phase labels for this solution run in aqueous solution. After

11. ## calculus

Find the points on the curve below at which the tangent is horizontal. Use n as an arbitrary integer. (Enter your answers as a comma-separated list.) y = sin x/ 2 + cos x

12. ## chem

Calculate ΔG° (in kJ/mol) for the following reaction at 1 atm and 25 °C: C2H6 (g) + O2 (g) → CO2 (g) + H2O (l) (unbalanced) ΔGf° C2H6 (g) = –32.89 kJ/mol; ΔGf° CO2 (g) = –394.4 kJ/mol; ΔGf° H2O (l) = –237.13 kJ/mol

13. ## statistics

Please let me know if I solved this right The lifetime of television produced by the Hishobi Company are normally distributed with a mean of 75 months and a standard deviation of 8 months. If the manufacturer wants to have to replace only 1% of its

14. ## chemistry

If 10g of steam at 110 c is pumped into an insulated vessel containing 100g of water at 20 c, what will be the equilibrium temperature of the mixture? spheat H2O(l)=4.18J/g*c, spheat h2O(g)=2.03J/g*c, heat of vap H2O(l)=2.260kJ/g

15. ## Math

1. Which property is NOT a characteristic of a parallelogram? A. Opposite sides are not congruent B. All angles are congruent** C. Opposite sides are parallel D. Opposite angles are congruent

16. ## Chemistry

List the amino acid side chains that can accept H+ and those that can donate H+ during enzyme catalyzed reactions. I have lysine, arginine, and histidine as acceptors and serine, threonine, and tyrosine as donators. Could someone just tell me if those are

17. ## Chemistry

Write IUPAC name of the following alkanes: 1. (CH3)3-C-CH2-CH2-CH3 Would the name be 2,2,4-trimethylhexane? 2. CH3CHCH2CHCH2CH2CH3 with a CH3 attached to the 2nd carbon and the 4th carbon. Would the name be 2,4-diheptane? 3. CH3-C-C-CH3 with a CH3 attached

18. ## Public Speaking

Evaluating audience feedback to your speech presentation usually happens: A. before the speech. B. after the speech. C. during the speech. D. in the speech preparation

19. ## Chemistry

How much heat would be required to convert 234.3 g of solid benzene, C6H6(s), at 5.5 c into benzene vapor, C6H6, at 100 c? mp of C6H6=5.5c bp of C6H6=80.1 c mhc C6H6(l)=136J/mol*c mhc C6H6(g)=81.6J/mol*c mhfusion at 5.5 c=9.92kJ/mol mhvaporization at 80.1

20. ## Chemistry

What is the molarity of an HNO3 solution if 24.1mL of a 0.250M Ba(OH)2 solution is needed to titrate a 15.0mL sample of the acid? Can you tell me the process to finding this answer?

21. ## chemistry

Which represents the largest pressure? A)five mmHg B)one atmosphere C)one millimeter of mercury D)one hundred pascals E)five pounds per square inch I tried converting them all to mmHg and I think the answer is B, but I just want to make sure.

22. ## geometry

6. Are the two triangles similar? How do you know? (1 point) no yes; by AA ~** yes; by SAS ~ yes; by SSS ~

23. ## Math

Outside temperature over a day can be modelled as a sinusoidal function. Suppose you know the high temperature for the day is 87 degrees and the low temperature of 63 degrees occurs at 5 AM. Assuming t is the number of hours since midnight, find an

24. ## trig

Find all solutions of cos (x) + 1/2 sec (x) = -3/2 in the interval (2pi, 4pi) (Leave your answers in exact form and enter them as a comma-separated list.)

25. ## chemistry

A quantity of electrical charge that brings about the deposition of 4.5 g Al from Al3+ at a cathode will also produce what volume (STP) of H2(g) from H+ at a cathode? I know there are 3 e- difference b/w the two reactions. I took 4.5 g/3 and get 1.5 g H2.

26. ## chemistry

Calculate the pH at the point in the titration of 25.00 mL 0.108 M HNO2 at which 10.00 mL 0.162 M NaOH have been added. For HNO2, Ka=5.1 x 10^-4 and: HNO2 + OH- -----> H2O + NO2- I know that HNO2 is a weak acid and NaOH is a strong base. Help given to me

27. ## accounting

P20-2A For the year ended December 31, 2010, the job cost sheets of DeVoe Company contained the following data. Job Number Explanation Direct Materials Direct Labor Manufacturing Overhead Total Costs 7640 Balance 1/1 \$25,000 \$24,000 \$28,800 \$77,800 Current

28. ## Math

What is the multiplicative inverse of 6 1/7? My answer- 16

29. ## Chemistry

Ok so reviewing my notes I also got 11,326.6 as the volume in ml. The density of water he wanted us to use was (0.9975) and I went from 1 gal of H2O = 3.785 liters = 3785 grams then multiplied by 3 giving me 11,355g H2O. The only other step I could come up

30. ## Math

You want to find the total amount of water in a storage tank that measures 2 ft by 4 ft by 3 feet. Which of the following expressions could be used to find the measure of the tank capacity in cubic feet? a. 2x4x3 b. 2+2+4+4+3+3 c.(2x4x3)x2 d.(2+4)x3

31. ## Math

The portion of a swimming pool that is below the full water line measures 12 feet by 30 feet by 6 feet deep. What is the volume of water in the swimming pool when it is full, expressed in cubic yards? (1 cu yd =27 cu ft) a.60 cu yd b. 72 cu yd c.74.6 cu yd

32. ## Math

What is the rule for the pattern < < < # < < < # n + _______?

33. ## Chemistry

An amino acid has the form shown at R-CH-C-O^- (with a NH2 bonded to the CH and a O double bonded to the C) (O^- means the C has a negative charge) a) a pH of 7.0 b) any pH other than 7.0 c) a pH greater than its isoelectric point d) its isoelectric point

34. ## Chemistry

What is the repeating unit of nylon 6-6?

35. ## Chemistry

Write IUPAC name of the following alkanes: 1. (CH3)3-C-CH2-CH2-CH3 Would the name be 2,2-dimethylpentane? Wouldn't it look like this: CH3-C-CH2-CH2-CH3 with a CH3 on the top and bottom of the C, which would be the 2nd carbon... right? I don't understand

36. ## some science

a filter tip or a cigarette acts as both a filter and a condenser. which of the following cannot be removed, assuming the filter tip is 100% efficient? a. carbon monoxide, boiling point -191 degrees. b. nicotine, boiling point 247 degrees. c. tar, boiling

37. ## career

Now that you have explored different types of careers, you should have some idea of what kind of career you would like to pursue. In one or two paragraphs, answer the following questions: What kind of job within your chosen career field do you wish to

38. ## English

Which sentence contains the present participle of the verb (go)? A. Tyler is going to the soccer game. B. Tyler has gone to the soccer game. C. Tyler goes to the soccer game. D. Tyler will go to the soccer game.

39. ## programing

create an algorithm, flowchart, and pseudocode for a solution of the following problem. This solution will include the use of arrays needed to complete all parts of the logic. You have requested to develop a program that will record and process the

40. ## computer science

create an algorithm, owchart, and pseudocode for a solution of the following problem. This solution will include the use of arrays needed to complete all parts of the logic. You have requested to develop a program that will record and process the rainfall

41. ## physics

a bird flies 3km west and then 4km south. find the resultant displacement of the bird

42. ## chemistry

1. based on the equation below, how many liters of water can be produced from 8.5 L (assume that hydrogen is in excess) 2H2(g)+O2(g) --->2H2O(g)

43. ## Chemistry

Identify the compound and classify its functional group in the image H H H H H H H-C-C-C-O-C-C-C-H H H H H H H

44. ## Chemistry

What is the reducing agent in the following reaction? 2K + S - - > K2S K S*** K2S None of the above

45. ## Chemistry

Iron metal is formed during the reduction of iron(III) oxide: Fe2O3 + 3CO 2Fe + 3CO2 When 29.7 kg of Fe2O3 react with 17.8 kg of CO and 4.5 kg of Fe are recovered, what is the percent yield for the reaction?

46. ## Algebra

Using two variables - A carpenter wants to cut a 24-foot board into two pieces so that one piece is 5 times as long as the other. How long should each piece be?

47. ## physics

A ball is thrown vertically upward from the edge of a cliff of height 131 m. The initial velocity is 77.7 m/s. how high is the cliff?

48. ## Math

Directions: Use the following matrix to perform the elementary row operations sequentially. A=[3 2 |8] [5 2 |12] 1.) (1/3) R1 From the original matrix 2.) -5R1+R R2 From matrix in question 1.

49. ## Science

A sled and rider with a combined weight of 59 kg are at rest on the top of a hill 24 m high. (a) What is their total energy at the top of the hill? (b) Assuming there is no friction, what would the total energy be on sliding halfway down the hill?

50. ## Algebra

Assume the car can be purchased for 0% down for 60 months (in lieu of rebate). A car with a sticker price of \$42,900 with factory and dealer rebates of \$5,100 (a) Find the monthly payment if financed for 60 months at 0% APR. (Round your answer to the

51. ## Math Pre-Cal

When I am giving the point vertex of (1,-1) and another point of (2,2) and i need to put the answere in the form f(x)=ax^2+bx+c how would I go about doing that?

52. ## Physics

Three objects with masses m1= 36.5 kg m2= 19.2 kg m3= 12.5 kg Are hanging from massless ropes that run over a frictionless pulleys. If the system is released from rest, what is the magnitude of the acceleration in m/s^2 of mass m1? ___________________ O O

53. ## Physics

A farmer drives a 0.100 kg iron spike with a 2.00 kg sledge hammer. The sledge hammer moves at a constant speed of 3.99 m/s until it comes to rest on the spike after each swing. Assuming all the energy is absorbed by the nail, and ignoring the work done by

54. ## Physics

A 599 g piece of silver at 150 degrees C is submerged in 1000 g of water at 5 degrees C to be cooled. Determine the final temperature of he silver and water given Heat capacity of water= 4.18 x 10^3 j/kg degrees C Heat capacity of silver= 2.49 x 10^2 j/kg

55. ## Trigonometry

Find all solutions of 4(sin(x)**2)-8cos (x) -8 = 0 in the interval (2pi, 4pi). (Leave your answers in exact form and enter them as a comma-separated list.)

56. ## chemistry

Describe what happens in a fission reaction. What is a commonly used isotope in a nuclear fission reactor? Describe how a fission nuclear reactor power plant works.

57. ## Homeland Security

the development of Al Qaeda, at what point in the organization’s growth do you feel it should have become a concern to United States government officials? Explain

58. ## med. terminology

i am having some trouble, i have found some of the mistake but seem like i cant finf the rest: CHIEF COMPLAINT: This 53-year-old man visited the outpatient clinic for dyspnea and recurrent coughing. HISTORY OF PRESENT ILLNESS: This patient has a long

59. ## Physics HELP!

A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in the figure. Model it as a stiff rod of negligible mass 3.00 m long and joining

60. ## Math

is solve f(x) = 0 for x the same thing as solve f(x) = 0? Would you do the same thing or does the difference in the wording make it a different question?

61. ## maths

a regular dodecagon has a side lenght of 5.6cm find the side lenght of a regular octagon that has the same perimeter?

62. ## chemistry

P(s)+ H+ + NO3- ---> H2PO4 + NO + H2O I am trying to write the two half rxns and I can get one, but not the other. I have: red: NO3- +4H+ +3e- ---> NO + 2H2O Ox: P(s) + ? ----> H2PO4- + x e- thank you!

63. ## chemistry

If given the quantum numbers: 2,1,-1,-1/2 give the element. I understand the first two numbers and getting to the p orbitals of the second period, but I am not sure on how to designate -1 and -1/2 to Carbon (the answer) Also for: 4,1,0,-1/2 is Selenium. I

64. ## maths

ben bought a car for £12,000 each year the value of the car depreciated by 10% what is the value of the car 2 years after he bought it?

65. ## maths

abby and berry share £22 in the ration 3:1 how much do each person get?

66. ## chemistry

How do you find the molarity(M) of NaOH in this reaction: 2NaOH(aq) + H2C2O4-H2O > Na2C2O4(aq) + 2H2O The only given information is 0.2079g of H2C2O4-2H2O

67. ## Science

The chemical eqaution H squared + Cl squared > 2 HCl represents which type of reaction? Thanks, if you can get it):

68. ## Algebra

Use P= -7200+300x-2x^2 p= profit x- selling price question: Determine the selling price when 90% of the maximum possible profit is earned

69. ## thermo

equal masses of ice at 0 oC, water aat 50 oC and steam at 100 oC are mixed and allowed to reach equilibrium. what will be the final temp of the mixture? and what percentage is the water and what percent will be steam??

70. ## thermo

equal masses of ice at 0 oC, water aat 50 oC and steam at 100 oC are mixed and allowed to reach equilibrium. what will be the final temp of the mixture? and what percentage is the water and what percent will be steam??

71. ## algebra

Can someone PLEASE explain how to do this to me? Thank you so much! Ten gallons of a 30% acid mixture is obtained by mixing a 50% solution (X) with 20% solution (Y). Write an equation for the 10 gallon mixture. What is the acid concentration, in gallons,

72. ## Biology

We cut a slice of the target gene from the gel which ran electrophoresis. And then purified the gene from the gel by using Gel-M column, WN buffer and WS buffer. After these steps, we ran another electrophoresis of the purified gene and there was no band

73. ## Chemistry

The reaction of 1,6-hexanediamine with hexanedioic acid chloride to form nylon 6-6 is a condensation polymerization. What is the small molecule that is split off in each step of the reaction?

74. ## Chemistry

CORRECTION: (sorry!) What major product will be obtained if the following alcohol is dehydrated: CH3 | CH3CH2CCH3 | OH (the CH3 is connected to the 3rd Carbon from the left and the OH is attached to the same Carbon) I tried to do it and this is what I got:

75. ## Art

I need a 3d picture of a mansion or a villa for my two point perspective can you tell me a good website PLease

76. ## sicence

with your knowlage draw a diagram of the chemical changes of when a candle is alight

77. ## Japanese

How do you write appositives in Japanese? The sentence I have is "The frog who lived in Osaka wished to go to Kyoto, where the great Midako had his palace.

78. ## Linear Measurements

Is one mile about 1609 meters? Is one meter about 39 inches? About how long is one kilometer in miles? And i have other questions but i shall try to figure them out!HELP PLZ!!! yes, yes, .6 miles

79. ## Neon

I need to find out the cost of the inert gas, Neon and it's Normal Phase to finish off a project. I have searched and searched but can't come up with the info needed. Neon is a rare gas, obtained by liquifing air. Its cost for very pure form is about

80. ## math

A 13​-foot ladder is placed against a vertical wall of a​ building, with the bottom of the ladder standing on level ground 12 feet from the base of the building. How high up the wall does the ladder​ reach?

81. ## math

4/3 cup of sugar to make 24 cookies how much cups for 48 cookies

82. ## geometry

What similarity statement can you write relating the three triangles in the diagram? ΔJMK ~ ΔMLK ~ ΔJLM ΔJMK ~ ΔLMK ~ ΔJLM ΔJLM ~ ΔMLK ~ ΔJKM*** ΔJKM ~ ΔMKL ~ ΔMJL

83. ## geometry

1. The Seattle Space Needle is 604 feet tall. A model of the building is 48 inches tall. What is the ratio of the height of the model to the height of the actual Space Needle? (1 point) 151:1 151:12 1:151*** 12:151

84. ## geometry

Given Line RQ, TQ, WQ, and YQ are radii. Prove: triangle QWT is congruent to triangle QYR

85. ## math

I am a three-digit number the sum of my digits is eighteen Five letters are used to spell my second number The difference between my first two digits is one. I have fewer even digits than odd digits My second digit is greater than my first digit I am a

86. ## programming

how do you design a program that asks the user to enter a store's sales for each day of the week. the amount should be stored in an array. use a loop to calculate the total sales for the week and display the result.

87. ## math

what is 9+10-5°/°2=

88. ## astronomy

Earth is spinning at 1670 km/h at the equator. Use this number to find Earth’s equatorial diameter.

89. ## social studies

1.Which is an effect of deforestation? A. soil erosion B. air pollution C. water pollution------- D. earthquakes 2. Which of the following is a reason so many people have migrated from Middle America to other regions? A. They dislike the region's climate.

90. ## Maths

How much would weekly repayments be on a credit card with balance of \$1000 and interest rate of 13.5%

91. ## English

If you want information about the link between heroin addiction and prescription drugs, including painkillers, which combination of search terms would give you the best results? (They are talking about if you search up the terms in ENCORE) Heroin addiction

92. ## Vectors

How much work is done by the orderly pushing a 85 kg person up a 5 m ramp inclined at an angle of 15° to the horizontal? I did W = (85)(9.8)(5)cos15, but to get the correct answer you are supposed to use (85)(9.8)(5)sin15 instead. Why do we have to use

93. ## physics

A box weighing 890N is pulled along a horizontal surface by means of a string which is at 30o above the horizontal. If the coefficient of kinetic friction is 0.2 and the box is accelerated at 0.8 m/s2, what is the tension in the string

94. ## Math

Find the values of the variables. [-12 -w^2] = [2k -81 2f 3 -14 3 Please help me. I don't know how to do this at all, and can you show your work so I can understand better. Thanks

95. ## science

how does a grassland follow conservation of mass

96. ## Maths

There are 40 children on a bus, there are 12 more boys than girls, how many girls are there on the bus?

97. ## physics

a cyclist travels 2.5km east, then 10km south and finally 5km west. determine the cyclist's overall displacement from their starting point.

98. ## School

Who is Jean Kessner?

99. ## Physics

A catapult of a spring constant 100N/M contains 2.0J of elastic potential energy when it is pulled back. What is the extension of the rubber band? I know that E= F/K but I don't know how to work out the force from the information provided, help would be