Karla

Most popular questions and responses by Karla
1. Physics

A hollow, spherical shell with mass 2.00 kg rolls without slipping down a slope angled at 38.0 degrees. (a) Find the acceleration, the friction force, and the minimum coefficient of fricition needed to prevent slipping. You will find the moment of inertia

2. Physics

One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle, theta, with the stick. The coefficient of static friction between the end of the meter stick and the wall is 0.390. A. what

3. Math

There eight girls competing in an ice=skating competition. In how many ways can they finish in first, second and third place? 366 1,680 2,016 40,320 I think it is 2,016

4. algebra 2

f(x)={2x,x1} Given the piecewise functions shown below, select all of the statements that are true. A.f(5)=1 B.f(2)=4 C.f(-2)=4 D.f(1)=5

5. chemistry

In a 1.0x10^-4 M solution of HClO(aq), identify the relative molar amounts of these species:HClO, OH-, H3O+, OCl-, H2O

6. CHE1

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2(l) → 2H2O(l) + O2(g) ΔH = -196 kJ Calculate the value of q (kJ) in this exothermic reaction when 4.60 g of hydrogen peroxide decomposes at constant

7. English

In Marigolds how does the author use of tone help describe Elizabeth's perception of her childhood? -her tone sounds solemn at first showing that she was reflecting over her sad or hard childhood. Then it switches to matter of fact because she realizes she

Assume a bank loan requires a interest payment of \$85 per year and a principal payment of \$1,000 at the end of the loan's eight-year life. a) How much could this loan be sold for to another bank if loans of similar quality carried a 8.5 percent interest

9. Algebra

in what form is the following linear equation written? 3x-2y=4 A.rise-run B.standard C.slope-intercept D.point-slope

10. Physics

A woman with a mass of 50kg is standing on the rim of a large disk that is rotating at an angular velocity of .50 rev/s about an axis through its center. The disk has a mass of 110kg and a radius of 4.0m. Calculate the magnitude of the total angular

11. math

Greg has a dollar bill, quarters, and dimes. how many ways can he make \$1.75?

12. algebra2

how many solution are there to the equation below? 3x-10(x+2)=13-7x A.1 B.0 C.Infinitely many

13. math

Suppose you take out a loan for 180 days in the amount of \$13,500 at 11% ordinary interest. After 50 days, you make a partial payment of \$1,000. What is the final amount due on the loan?

14. chemistry

Calculate the pH during the titration of 20.00 mL of 0.1000 M CH3CH2CH2COOH with 0.1000 M NaOH after 26.5 mL of the base have been added. Ka of butanoic acid = 1.54 x 10-5.

15. English

Either Chris or the new employee _________ the mail before Dolores or Charles ____. a. sort/arrives b. sort/arrive c. sorts/arrives d. sorts/arrive

16. chemistry

what is the molecular geometry and bond angles of CF2Cl2? Is there any reason to suspect this won't be tetrahedral with bond angles of 109.5? The difference in electronegativity between F and Cl would be expected to alter the angles somewhat.

17. geonetry

What is the area of sector CED when DE = 15 yd?

18. Geography

What kinds of problems might exist in the Western Cordillera region for farming and transportation? Please help. thanks. Thank you for using the Jiskha Homework Help Forum. Each time you post try to give the complete frame of reference. When you just say

19. Chemistry - Solubility

Calculate the solubility of copper(II) sulfide in a solution that is 0.150 mol L^-1 in NaCN. I am very confused on what to do. Since there are no common ions, I know that this is not the common ion effect. Also I do not believe this is a pH effect

20. college chemistry

When a solution containing 8.00 g NaOH in 50.0 g of water at 25 °C is added to a solution of 8.00 g of HCl in 250.0 g of water at 25 °C in a calorimeter, the temperature of the solution increases to 33.5 °C. Assuming that the specific heat heat of the

21. Physics

A cord is wrapped around the rim of a wheel .250 m in radius, and a steady pull of 40.0 N is exerted on the cord. The wheel is mounted on frictionless bearings on a horizontal shaft through its center. The moment of inertia of the wheel about this shaft is

22. chemistry

Calculate the pH during the titration of 20.00 mL of 0.1000 M CH3CH2CH2COOH with 0.1000 M NaOH after 26.5 mL of the base have been added. Ka of butanoic acid = 1.54 x 10-5.

24. math

The greatest integer function ,shows below, is defined to be greatest________less than or equal to x. f(x)=[[x]]

25. Chm General 2

if a student doing an experiment failed to dry the KHP before using it to standarize the NaOH solution. A) Would her calculated molarity of the NaOH solution probably be too hight or too Low?

26. psychology

PLEASE HELP LAST QUESTION.??? Among William James's contributions to the science of psychology is that he A. he wrote the first American text in psychology b.. developed a psychodynamic treatment for mental illness. c.experimented with classical

27. Physics

Forces F1=7.50N and F2=5.30N are applied tangentially to a wheel with radius 0.330 m. What is the net torque on the wheel due to these two forces for an axis perpendicular to the wheel and passing through its center? It depends upon whether or not the

28. Math

A bus is traveling at 79.7 kilometers Er hour east, how far does the bus travel 1.45 hours?

29. English

Identify each as fragment, run-on, comma splice, or sentence. One legend has it that an old lady tried to dry off her sopping wet dog by putting it in the microwave this legend also predates the microwave oven. a. fragment b. run-on c. comma splice d.

30. chemistry

25mL of tap-water is titrated with .00500 M EDTA. 7.95mL of EDTA is required for complete reaction, Whatis the molarity of that total water hardness in the 25mL sample

31. math

A new car comes in 5 exterior colors and 3 interior colors. How many different-looking cars are possible?

32. Chemistry

Find the pH during the titration of 20.00 mL of 0.2380 M butanoic acid, CH3CH2CH2COOH (Ka = 1.54 10-5), with 0.2380 M NaOH solution after the following additions of titrant. (a) 0 mL Ive got the answer of 2.72 (b) 10.00 mL Ive got the answer of 4.81 I'm

33. Science

What kind of substance has properties that reflects light very well, warms up in my hand, flattens out when it hits with a hammer and conducts electricity?

34. English

This is about Sound and Fury- Dan Greenburg Where is Greenburg's point stated in his essay and what is his point? How would the meaning be different if Greenburg had ended his essay with paragraph 29?

35. MATH

13. A tree casts a shadow of 17 ft. The angle of elevation from the tip of the shadow to the top of the tree is 68°. To the nearest foot, what is the height of the tree? 14. The angle of depression of a diver from the boat is 34°, and the diver is 367 ft

36. College Physics

Large boxes of pumpkins are set on a ramp to be unloaded out of a truck. The 300.0 lb boxes are set on the ramp which has an incline of 35 degrees. They must then be pushed to get started down the plane towards the bottom. If the coefficient of the static

37. statistics

John drives to work each morning and the trip takes an average of  = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of  = 5 minutes. For a randomly selected morning, what is the probability that John's

38. Physics

The Spinning Figure Skater. The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center . When his hands and arms are brought in and wrapped around his body to execute

39. math

the Nile River is the longest river in the world that 4160 miles a group of explorers travel along the entire now in xx days they traveled the same distance each day write an algebraic expression to find out each day's distance

40. Physics

A stone is dropped off the science building and accelerates, from rest, toward the ground at 9.8 m/s/s. A curious physics student looks out the third floor window as the stone falls past. She happens to have a stopwatch and she finds that it takes 0.30 sec

41. Chemistry-nudge the

A 4.30 g nugget of pure gold absorbed 298 J of heat. The initial temperature was 22.0°C. What was the final temperature? °C

42. Chemistry

A 4.30 g nugget of pure gold absorbed 298 J of heat. The initial temperature was 22.0°C. What was the final temperature? °C

43. Macroeconomics

Consider the following data: The money supply in \$1 trillion, the price level equals 2, and real GDP is \$5 trillion in base-year dollars. What is the income velocity of money?

44. Physics

Large boxes of pumpkins are set on a ramp to be unloaded out of a truck. The 300.0 lb boxes are set on the ramp which has an incline of 35 degrees. They must then be pushed to get started down the plane towards the bottom. If the coefficient of the static

45. us.history

Why should Americans in the 1920s have shown greater concern for their future? then it tells me to note three things that were,or might have been,seen as "clouds in the blue skies of prosperity" i noticed someone has the answer but mines is very

46. physics

a car skids to a halt at a rate of -9.4 m/s2. the skid marks measure 34 m. what speed was the car going when it slammed on the brakes?

47. math

two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular

48. Physics

A hot-air balloonist, rising vertically with a constant velocity of magnitude v = 5.00 m/s, releases a sandbag at an instant when the balloon is a height h = 40.0 m above the ground. After it is released, the sandbag is in free fall. For the questions that

49. algebra2

How many solutions are there to the equation below? 145=10x-8x

50. physics

What is the length of a box in which the difference between an electron's first and second allowed energies is 1.30×10−19 ?

51. physics

Standing on top of the science building, which is 48 m high, a group of students use a slingshot to shoot a steel ball bearing straight up into the air. The ball bearing passes the students on its way down to the ground 3.2 sec after it was shot. (once the

52. Math

Two cars start from the same place and travel in the same direction. If one car travels at 60 miles per hour and the other travels at 45 miles per hour, in how many hours will they be 60 miles apart?

53. Algebra

Solve the given polynomial equation. Use the Rational Zero Theorem and​ Descartes's Rule of Signs as an aid in obtaining the first root. 2 x cubed minus 5 x squared minus 5 x minus 1 equals 02x3−5x2−5x−1=0

54. math

11 increased by twice Vanessa's age

55. algebra2

How many solutions are there to the equation below? 220=2x-12x a.1 b. Infinitely many c.2

56. math 5th

in the following addition problem, each letter stands for a different digit. Find the value of X, Y, and Z XYZ + ZYX _______ YYZY

57. Chemistry

If 45g of a 2.2% NaHCo3 solution is to be prepared how many grams of NaHCo3 are needed

58. ap world history

Can you compare North American racial ideologies and their effects on society with Latin American/Caribbean racial ideologies and their effects on society in 1500-1830?

59. algebra

6x-7x=20 what is the value of x-

60. physics

I keep seeing 7.620497955 as the electrical force between a proton and electron but when I multiply (8.99 x 10^9)(1.602 x 10^-19)-(1.602 x 10^-19)/(10^-10)2 I get a diffrent answer. Am I multiplying the wrong numbers?

61. Chemistry

Assuming ideal behavior, determine the mole fraction of acetone in a solution of acetone and water if the vapor pressure of acetone changed from 750mmHg to 735mmHg.

62. algebra2

hoe many solutions are there to the equations below? 8x+47=8(x+5)

63. Math: Finance

Need help solving these finance questions? PV = C/r PV= C/r-g P= D/r-g 1st: Tom is 30 years old today. His salary next year will be \$20,000. He forecasts salary growth of 5%/year and plans to retire at 60. 1) If the discount rate is 8%, what is the PV of

64. math

how do i show my work for, 5+10/(1*(8+6)-4=6 ya i know the answer but i wanna know how to show my work.

65. Maths

Hey :) I was wondering if someone could tell me if this answer and working is correct or not... Cos theta =-0.25 Cos inverse -0.25 = -14 therefore theta equals: 180--14=194or/and 180+-14=166 Any help would be much appreciated :) Thanks!

66. physics

the mean radius of the earth is 6,000,000 meters. Express this value in kilometers

67. Chemistry-Titration

Acid (Unknown) Solution: HCL Molar Ratio: 1:1 Volume:20 ml Concentration:? Base(Known) Solution: NaOH Molar Ratio 1:1 Volume 26 ml Concentration:0.1

68. Economics

4.20 Diamonds clearly satisfy less important needs than water, which is essential to life. Yet according to market prices, the essential commodity, water, is worth less than the less essential commodity, diamonds. Why would a vital com-modity such as water

69. Math

Molly’s age is twice Anita’s. If the sum of the squares of their ages is 80, then Translate these words into an algebraic equation to determine their ages?

70. Math help plz ASAP.

Rationalize each denominator. 6 + square root of 2 ____________________________ square root of 3 PLZ HELP..dont kno how to do this question.plz explain..thanks You have (6 + sqrt(2))/sqrt(3) multiply that by sqrt(3)/sqrt(3) to get [(6 + sqrt(2))*sqrt(3)]/3

71. physics

a store advertises carpet that costs \$ 18.95 per square yard. how much does that carpet cost per square meter?

72. math

grant pays \$0.10 per minute plus \$5 per month for telephone long distance write an algebraic expression for m minutes of long distance calls in one month

73. math

Finney & Company purchased \$1,800 of merchandise on 5/6. The terms were 2/15 EOM. The sneakers were received on 5/20, sent FOB Shipping Point. Freight charges amounted to \$45. What payment must be made by that date to take advantage of the discount?

74. math

ms.joliet gave a math quiz to see how her small group was doing. what score would make the median 90, the mode 85, and the range 20 if she had the numbers listed below 85,85,90,?,100,85,80,100,90

75. algebra 2

how do i find the are of the region defined by |x|+|y| less than or equal to 5 and |x|+|y| greater than or equal to?

76. Chemistry

At standard temperature a gas has a volume of 275ml if the temperature is increased to 130C buit the pressure is held constant what is the new volume?

77. math

two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular

78. Global History

How has the scientific method impact our understanding of the world and the way we study it?

79. biology

how does a hypothesis help scientists understand the natural world?

80. Chemistry

How would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?

81. history

the production of_________ was one of the first industries to be affected by the industrial revolution.

82. Chemestry

What is the molecular mass of a gas that has a density of 0.897 g/L if it exerts a pressure of 1.35 ATM and is that a temperature of 43.5°C?

83. math

Alana picked p peaches. Michelle picked 18 times as many peaches as Alana. Write an expression that shows how many peaches Michelle picked.

84. Math

Mr. Hernandez asked his students to estimate the area of the circular garden in front of the school. If the radius of the garden is 7 feet, which statement is closest to the area of the garden

85. Math

Mandy runs 4 km in 18 minutes if she planes to run in a 15 km race how long will it take her to complete the race

86. Math

Genrald and Michelle went on a 24-mile bike ride. They rode 1/4 of the distance before stopping. By lunchtime, they rode 5/8 of the total distance. How many miles did they have left to ride after lunch?

87. math

a slice of pizza has 290 calories to find out how many write an algebraic expression to find out how many calories there are in a slices of pizza and b stalks of celery

88. chemistry

how many moles of H2O are produced when 5.00 mols of oxygen gas are used

89. Math

Cepheid variables are vital for measuring the distances of relatively nearby galaxies. What is the probability of finding a cepheid variable star? State ALL your assumptions

90. English

What public health issue starts the escalation of misery in "top of the food chain"?

How long to the nearest year, will it take an investment to double if it is continuously compounded at 4% per year

92. algebra 2

how do i find the are of the region defined by |x|+|y| less than or equal to 5 and |x|+|y| greater than or equal to?

93. Physics

Assume a block on unknown weight rests on an incline of 25 degrees and is initially not moving. What push (P) is required to start moving the block if the coefficient of static friction is 0.7?

94. College history

Explain the meetings that resulted in the Japanese seeing "Rolls-Royce,Rolls-Royce,Ford" and how was this part of Americans "clamoring for the outlawry of war? I need help with this question because I don't understand the question and what exactly it is

95. physics

in a vessel of 40 cm3 of water at 4 ° C is introduced aluminum over 80g to 8 º C. neglecting the effect of the vessel, calculate final temperature

96. chemistry

in a recipient of 40 cm^3 of water at 4°C is introduced aluminum over 80g to 8ºC. neglecting the effect of the recipient, calculate final temperature

97. math

From a point on a straight road, two cars are driven in opposite directions, one at 44 miles per hour and the other at 35 miles per hour. In how many hours will they be 237 miles apart?

98. Chemistry

How would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?

99. Chemistry

How would you make 500 mL (0.500L) of a 0.200 M HCl solution from stock concentrate of 12 M HCl?