1. AP CHEMISTRY HELP

a) A student fails to wash the weighing paper when transferring the KHP sample into the beaker. What effect does this error have on the calculated molarity of the NAOH solution? Mathematically justify your answer. b) A student failed to notice an air

2. maths

sita and gita start walking from the same point on the road but in opposite directions.if sita walks at the speed of 5km/h and gita @ a speed of 4km/h,in how much time will they be 27km apart

3. Physics

A placekicker kicks a football at an angle of 60°. At what angle will the football hit the ground.

^ RST m

5. Math *URGENT

Please give the answers and solutions for each. 1.If the second term is 2 and the seventh term of a geometric sequence is 64, find the 12th term. 2. Which term if the geometric sequence 18,54,162,486,... is 3,188,646? 3. Determine the geometric mean of 8

6. Calculus

A swimming pool is 60ft long by 25ft wide. Its depth varies uniformly from 3ft at the shallow end to 15ft at the deep end. The pool is being filled with water at a rate of 800ft3/min. There is 5ft of water at the deep end. What is the equation for finding

7. Physics...Help!!!

given that Earth's surface gravitaitional field strength has a magnitude of 9.80N/kg, determine the distance(as a multiple of Earth's radius re) above the Earth's surface at which the magnitude of the field strength is 3.20N/kg.

8. physics

Before a collision, a 24 kg object is moving at +13 m/s. Find the impulse that acted on the object if, after the collision, it moved at the following velocities. (a) +8.0 m/s (b) -8.0 m/s

9. Physics

4) A 10 cm cylinder chamber has a 5cm diameter piston attached to one end. The piston is connected to an ideal spring with a spring constant of 10N/cm. Initially the spring is not compressed but is latched in place so that it cannot move. The cylinder is

Jim Company bought a machine for \$36,000with an estimated lofe of 5 years. The residual value of the machine is \$6,000 Calculate (a) the annual depreciation and (b) the book value at the end of year 3. Assume straight-line depreciation

11. Chemistry

30 grams of a metal at 100 degrees Celsius is placed in a calorimeter containing 100 mL of water at 21 degrees Celsius. After a few minutes, the temperature inside the calorimeter is 24 degrees Celsius. What is the specific heat of the metal?

12. physics

A piano is being moved into a concert hall up a 15m ramp that has a final height of 1.5m. To help with the weight, a rope has been tied between the piano and a counterweight through two pulleys. One at the top of the ramp and the other off the edge of the

13. Physics

A student librarian picks up a 2.2 kg book from the floor to a height of 1.05 m. He carries the book 8.3 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?

14. Chemistry

30 grams of a metal at 100 degrees Celsius is placed in a calorimeter containing 100 mL of water at 21 degrees Celsius. After a few minutes, the temperature inside the calorimeter is 24 degrees Celsius. What is the specific heat of the metal?

15. physics

The force required to stretch a Hooke’s-law spring varies from 0 N to 68.1 N as we stretch the spring by moving one end 16.2 cm from its unstressed position. Find the work done in stretching the spring

16. Physics

A lawn roller is pushed across a lawn by a force of 103 N along the direction of the handle, which is 22.5° above the horizontal. If 63.0 W of power is developed for 90.0 s, what distance is the roller pushed?

17. Biostatistic

An enzymatic method for determining alcohol in wine is evaluated by comparison with a gas-chromatography (GC) method. the same sample is analyzed several times by both methods with the following results (% ethanol). Enzymatic method: 13.1, 12.7, 12.6,

18. Physics

The gravitational force between two asteroids 1200 km apart is 8400 N. Find the following changes in gravity (do not write units) a) What is the force between them if the distance is 600 km?

Jim Clinnin purchased a used RV with 19,000 miles for \$46,000. Originally the RV sold for \$70,000 with a residual value of \$20,000. After subtracting the residual value, depreciation allowance per mile was \$.86. How much was Jim's purchase price over or

20. Physics

Use Kepler's Laws and data about the Moon to determine the orbital period (hours) of a satellite that is 17512 km above the SURFACE of the Earth. HINT: How does the radius of the Earth affect the problem?

21. maths --plse help me..

The diameter of a roller is 80 cm and its length is 126 cm. It takes 750 complete revolution once over to level a playground. find the area of the ground.

22. math

An escalator moves down at the rate of 60 steps per minute. Alan can walk fast up ordinary steps at the rate of 80 steps per minute. There are 50 steps from one level to another. Alan decides to walk fast up the down escalator. How long will it take him to

23. robinswood

the area of a square tetherball court is 260 ft2. what is the approximate length of each side of the court? find answer th the nearest foot? i really have a hard time with these word problem...please help me

24. mechanical science

10. A car is moving in a straight line starts from rest, accelerates uniformly at 12 m/s2 for the first 5s, then travels at uniform speed for the next 2s and finally decelerates uniformly at 4 m/s2 for the next 5s. Draw the acceleration-time graph,

25. History

Why was the Fordney-McCumber Tariff of 1922 a BAD thing for the U.S. Economy? There seems to so many and I would like to know the most important ones.

From the following facts, complete a depreciation schedule using thee straight - line cost of Highlander- \$30,000 residual value- \$6,000 estimated life- 8 years

27. Physics

A small spaceship whose mass is 1.5x10^3 kg (include-ing an astronaut) is drifting in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 10 kW laser beam, what speed will the ship attain in 1.0 day because of the

28. physics

2. A ball is thrown vertically upward from the 15m level in an elevator shaft with an initial velocity of 20 m/s. At the same instant an open-platform elevator passes the 6m level, moving upward with a constant velocity of 2 m/s. Determine a. When and

29. English

Can someone please read over my essay and take note of any errors or suggested revisions? Thanks. The title of Lorraine Hansberry’s A Raisin in the Sun represents the dreams of the characters in the play and how they become crushed. At the beginning of

30. math

Each time the same letter appears it represents the same digit.Different letters represent different digits.C+C=D;D+E=17;A+2C=D;2B+C=8.Find the sum A+B+C+D+E

31. math

what is 98,605 divided by 75

32. mechanical science

11. In an accident a freeway sports car made skid marks 200 m long along the pavement. The police estimated the braking acceleration of the car to be – 0.8g under the road conditions prevailing. Determine the speed of the sports car when the brakes were

33. Physics

A(n) 563 kg elevator starts from rest. It moves upward for 3.18 s with a constant acceleration until it reaches its cruising speed of 1.96 m/s. The acceleration of gravity is 9.8 m/s 2 . Find the average power delivered by the elevator motor during this

34. physics

a mass of 5 kg descending vertically,draws up a mass of 3 kg by means of a light string passing over a pully.at the end of 4 s,the string.how much higher the 3 kg mass would go?

35. Pre-Algebra

5h – 9 = –16 + 6h Answer Choices: 4 –7 7 10 I need a step-by-step response cause I'm having a hard time understanding.

36. world history

completed the restoration of a central Japanese authority a. Kabuki b. banners d. The Dream of the Red Chamber f. Yi h. Zheng He i. ronin j. Tokugawa I think its h but that's kinda just a hunch.

37. robinswood

estimate the square root of 154 to the nearest hundredth

38. accounting

using the following information, calculate inventory turnover ratio, the average days in inventory, and the gross profit ratio for Howard Company for the year ended december 31, 2011( round to two decimal places) sales \$225,00 Cost of goods \$175,000 Ending

39. Math

Multiply or divide. Write the answer in simplest form. Type your answer as a number. 2 1/4 • 2 2/3

40. R&slotto pool

What are the possible numbers to play for todays club master lotto pool

41. math

find the circumference of the circle if the square has anarea of 144m^2

42. Physics

If the coefficient of kinetic friction between a 36 kg crate and the floor is 0.31, what horizontal force is required to move the crate at a constant velocity (so that FNET=0.0 N) across the floor?

43. PHYSICS

An electron gun is a device that sets up an electric field between two plates. The electrons start on the negative plate and thenare accelerated toward the positive plate and out a small hole in its middle if an electron in the gun feels the effect of

44. Physics

A hunter game in the woods keeps. Track of his movements from his car he travels 1/2 mile down a trail into the woods that leads directly north east. From there he bushwacks 3500 paces directly north before stopping for a drink. As he is putting his flask

45. Physics

A 5.4 kg soccer ball moving to the right at 5.6 m/s collides with a 7.6 kg basketball moving to the left at 3.8 m/s. The soccer ball bounces left at 6.5 m/s after the collision. What is the speed of the basketball after the collision?

46. math urgent

Solve the inequality. 8. c + 6 < –20 (1 point) c < –26 c < –14 c < 26 c < 14 9. ≥ –3 (1 point) d ≥ –16 d ≥ 39 d ≥ 10 d ≥ –39 10. –3p > –48 (1 point) p < 16 p > –51 p < –16 p > 16

47. Physics

Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .

48. Physics

A ball with a mass of 5.8 kg is moving to the right at 10.3 m/s and collides with a stationary ball of mass 10.9 kg. After the collision, the 5.8 kg ball moves to the right, but at an angle of 20° below the horizontal, at a speed of 4.3 m/s. Find the

49. maths --plse help me..

20% of boys in an exmaination were not appeared,70% of appeared boys passed the examination.What percentage of total registered boys for the exmaination were failed.If absent boys are considered as failed

50. science

A scientist collects a sample of carbon dioxide that contains 25 moles of CO2. In grams, what is the mass of the sample?

51. economics.Help!!!

How the technical rate of substitution and marginal product are relates and what is their difference?

52. physics

A 2561-kg van runs into the back of a 823-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.

53. math

If the recipe for 4 pancakes is 6tbsp flour and 1/4 pint milk how much milk and flour would you use for 1/4, 1/2, 2, 5, and 3 pancakes?

54. Biostatistic

The following replicate calcium determinations on a blood sample using atomic absorption spectrophotometry (AAS) and a new colorimetric method were reported. Is there a significant difference in the precision of the two methods?

55. social studies

briefly describe the important events of the cultures's past for new england usa

56. math plz help!

Multiply or divide. Write the answer in simplest form. Type the fraction or mixed number like the following example: 1 1/2 7/8 ÷ 2

57. math

The principal of Valley Elementary School wants to divide each of the three fourth-grade classes into small same-size groups with at least 2 students in each. If the classes have 18, 24, and 36 students, respectively, what size groups are possible?

58. science

Can we measure temperature of 45 degrees celcius using clinical thermometre ?

59. physics

2 runners accelerate from rest to their top speeds. The 1st runner pat has an acceleration of 5.9 m/s^2 and reaches her top speed in 4 sec. The second runner steven accelerates at 4.4m/s^2 and takes 6.5 sec to reach his top speed the 2 runners run flat out

60. math

How do I approach this problem? Seven green marbles and three red marbles are randomly placed in Box A and in Box B. Box A holds 4 marbles, while Box B holds 6. What is the probability that Box A has at least 2 green marbles?

61. Physics

Kang and Kodos orbit the Earth in a spaceship 20,000 km above Springfield.the period of their orbit (hours) is 11.8 and findthe speed (m/s) their spacecraft travels. b) Speed of spacecraft in meters per second m/s .

62. Physics

We want to rotate the direction of polarization of a beam of polarized light through 90 degrees by sending the beam through one or more polarizing sheets. (a) What is the mini-mum number of sheets required? (b) What is the minimum number of sheets required

63. physics

a mass of 5 kg descending vertically,draws up a mass of 3 kg by means of a light string passing over a pully.at the end of 4 s,the string.how much higher the 3 kg mass would go?

64. maths --plse help me..

Prove that the radius of the base of right circular cylinder of greatest curved surface area which can be inscribed in a given cone is half that of the cone

65. Algebra CTU

What is the unpaid balance of the business loan of 50,000 with interest rate of 9% compounded monthly for7 years, after the firt year of payments?

66. World history- does this sound okay?

if you had to give queen Elizabeth the first a grade on the enlightenment principles what grade would you give and why? I think I would give her a B bc for the most part she was a very big influence on the enlightenment era and she enabled quite a bit for

67. physics

A 0.201-kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.105 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction.

68. math i don't get it

If you have a 3 cup container and a 5 cup container, how can you measure exactly 1 cup.

69. Physic 115

A 5 kg block is placed on an inclined plane raised to angle theta with the horizontal when it just started to slip down. If coefficient of friction is 0.3, calculate theta and the speed of the block up the plane if it being pull up by a force of 30 newton

Assume you lease a \$45,000 BMW. Using a straight- line method with a 3- year ueful life and is a \$16, 675 residual value, what is the book value of the BMW after the first year?

71. math-calculus

The following equation shows the approximate relationship between the percentage y of total personal consumption spent on food and the corresponding percentage x spent on education. y = 38/x^0.38 percentage points; (6.5 ≤ x ≤ 17.5). According to the

72. AP Chem

I had to do an experiment to calculate the enthalpy of solution of Epsom salts. I'm stuck on how to calculate the amount of the reactant in moles. Here's some preliminary data: 37.58 g of Epsom salts in the solution Molar mass of solution: 246.48 g/mol I'm

73. Physics

A 2.3 kg block slides down a 25° inclined plane with constant acceleration. The block starts from rest at the top. At the bottom, its velocity is 0.65 m/s. The incline is 1.6 m long. What is the coefficient of friction?

74. algebra 1

please help. Write a linear equation in slope-intercept from to model the situation. A telephone company charges \$28.75 per mont plus .10 cent a minute for long distance calls

75. Chemistry

The relationship between ionization energies as evidence for electron configuration for elements?

76. SOCIALS 9 URGENT

answer in proper paragraph of 10-12 sentences What was the system of government called that was in place before the revolution? describe who were involved. Give some examples of what their occupations were. which types of people were for this type of

77. Math

1 3/8 • 6/11. Multiply or divide. Write the answer in simplest form. Type the fraction or mixed number like the following example: 1 1/2

78. physics

what will happen to the bone structure if earth becomes more dense than its actual density?

79. Precalc

1. Solve log (4x) = log (2) + log (x-1) the fact that this is x-1 and not + is really messing me up because i keep getting a negative number and that isnt possible 2. Solve: absolut value of(x^2 -4x-4) = 8 thanks so much!!! I have been studying and my

80. algebra 2

The label on a prescription bottle directs the patient to take the medicine twice a day. The effective ingredient of the medicine decreases continuously at a rate of 25% per hour. If a dose of medicine containing 1 milligram of the effective ingredient is

81. TO MS SUE

oops i fogot to say that it was the french revolution not the american one ... sorry that was my fault. CAN U STILL HELP ME :)

82. physics 11

By how much would 1200 W kettle, which is 72% efficient raise the temperature of 0.60 kg of water in 3.0 min?

83. Math

As an invesment Mrs. Astor purchased 2 paintings. She later sold the two paintings for \$24,000 each. On one painting she made a 20% profit, but on the other she esperienced a 20% loss. Mrs. Astor lost__________ on her investments in the 2 paintings.

84. eep

9. A toy is thrown vertically downwards from the top of a building and has an initial velocity of 1.5 m/s. If the height of the building is 25 m, determine i. the velocity with which the toy hits the ground ii. the time taken for the toy to fall

85. PHISIC help

water waves in a ripple tank are diffracted by a narrow aperture.if the wavelength of the water waves is decreased slightly whilst keeping the aperture size the same ,which one of the following will happen? the waves will spread out more the waves will

86. U.S History

which action is an example of the system of checks and balances? A. Texas requires at least 180 school days per year. B. An individuals pays both state and federal income tax. C. The House of Representatives votes to expel on of its members. D. The senate

87. MACROECONOMICS

What is the difference between nominal amounts and real amounts? Please explain this to me.

88. maths

let A be a nonempty set such that A *B = A *C show that B = C

89. math

what is the integers of the square root of 51

90. Math

3 1/3 ÷ 1 5/12 in simplest form. I do not know these at all so please help?

asked by T.J And the Vibe
91. SPELLING SENTENCE

My sentence is : The women rose their voice. is rose ok or is that the wrong spelling. pleese help and thank you.

92. social studies

Where was the first Quaker colony in North America located?

93. English - Writeacher

Thank you so much! Because you helped me with the articles my performence in class was pretty good. I just have to train my pronunciation. So just thanks a lot.

94. social studies

a map that describes the geography of new england usa

95. Physics

What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?

96. Video games, entertainment

Is the new video game far cry 3 OK for kids?

97. math

if 15 percent of 220 students chose going shopping out of the 220 percent students chose s how many chose go shopping. my answer is 33 am i correct

98. College Algebra

I have t = ln(2)/.04 and the book has the answer as 25ln(2) I know these are the same but please show me the steps to go from ln(20)/.04 to 25ln(2) What rules etc. make it so I can do that so I can do it on later problems Thank you

99. Physics

What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?

100. math

a bag has 57 blue and green marbles. there are 13 more blue marbles than green marbles. How many blue and green marbles are in the bag

101. Physics

How many times further from the Sun than the Earth is an asteroid with an average orbital period of 7.43 years? (HINT: Let the distance to the Earth be R=1 AU)

102. Algebra 2

How do i get the perfect square of: 3x^2+7x=-9

103. math

Finf the volume of the solid generated by revolving the region bounded by the curve. x=2/(y+1), x=0, y=0, y=3, about y-axis. My ans is pie unit^3. Is it correct? if wrong can i know the right calculation.

104. Statistics Help!

1. What does a stepwise regression analysis do? 2. What tests are used for longitudinal studies with 1 or more dependent variables?

105. science

why is using phenophthalin in determination of acetic acid in vinegar.

106. maths help plz!

e=√d/ab make d the subject ,do not include the bracket .thanks

107. math

please show work divide 1/2 divided by1/8 need to see steps thanks

108. physics

how to know the raiuds in GMm/r2?

109. Math

The length of each side of an equilateral hexagon is a whole number, and the length of each side of an equilateral octagon is a whole number. Both have the same perimeter. The perimeter must be a multiple of 16 ,18, 24,30 or 36 ?

110. math

Estimate each amount. 1. 81% of 60 2.48% of 97 3.20% of 490

111. science

if the car had a mass of 2050 kg and was traveling 25 miles per second, what was the car momentum?

112. robinswood

between what two consecutive whole numbers does the squre root lie? 1) square root of 70 2) square root of 35 3) square root of 6 4) square root of 52

113. Ms. Sue (History)

The Europeans raised their own tariff which caused a trade protection war. The American merchants had enormous surpluses and no market to sell their goods. This would cause a fall in prices and industrial instability. Am I on the right track?

Thanks

115. ENGLISH URGENT !!!!!!!

What are good things to buy for a 17 year old boy that are not that expensive???? this is really urgent for a part of my english project..... pleeeeeeeeeeeeeeeeeeeese help!!!!!!!

116. math

how do we find the scale factor

117. Math

How do I approach this problem? Seven green marbles and three red marbles are randomly placed in Box A and in Box B. Box A holds 4 marbles, while Box B holds 6. What is the probability that Box A has at least 2 green marbles?

118. Science

Is there a website where I can find more about the climate in my area?

Finding the Culprit At 4 a.m. in New York city the busy streets were now nothing but a whistle in the sky. There was no one there but a 14-year old girl wandering around, she had a light auburn hair that reached to her mid-waist. She was a fit tall girl,

120. intergrated topics/math

evaluate the following expression of a=3, b=10, and c=6

121. trig

Find the Opposite of the right angle where the angle is 61 degrees and the Adjacent is 10 cm.?

122. Physics

cart A with mass: 512g (0.512kg) is on a horizontal table. the cart is connected to cart b with mass: 51.0g (0.051kg) through a string that is crossing a pulley. cart A is released from rest at 60 cm(0.60m), it passes a photogate with a velocity of

123. maths --sets

let A be a nonempty set such that A *B = A *C show that B = C

124. intergrated topics/math

solve for x: 4x(5-6)=10(6x+2)