# Questions Asked onNovember 3, 2011

1. ## Physics

An Alaskan rescue plane traveling 36 m/s drops a package of emergency rations from a height of 137 m to a stranded party of explorers.Where does the package strike the ground relative to the point directly below where it was released

2. ## chemistry

a 10.0mL sample of an unknown H3PO4 solution requirs 112mL of 0.100 M KOH to completely react with the H3PO4. What was the concentrartion of the unknown H3PO4 solution? H3PO4 + 3KOH -----> 3H2O + K3PO4 Ive seen these problems with one volume but not two

3. ## Math

The length of a track around a football field is 1/4 mile. How many miles do you walk if you walk 2 3/4 times around the track?

4. ## Math

how many faces does rectangular prism have? and How many vertices does rectangular prism have?

5. ## Physical Science

DISTANCE-TIME for RUNNERS Time(s) 1 2 3 4 Sally's Distance(m) 2 4 6 8 Alonzo's Distance(m) 1 2 2 4 Make a distance-time graph that shows the motion of both runners. What is the average speed of each runner? Which runner stops briefly? Over what time

6. ## social studies

What do you think Deganawida meant when he said, "All shall receive the Great Law and labor together for the welfare of man"?

7. ## Physics

A baseball bat balances 61.1 cm from one end. If a 0.600 kg glove is attached to that end, the balance point moves 22.7 cm toward the glove. Find the mass of the bat.

8. ## Chemistry

Okay so I kinda understand where to put the numbers into the formula but i'm not sure how to calculate the distance so could someone kindly walk me through the problem so i can understand it. Thank you so much. Calculate the amount of energy required for

24. ## science

On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?

25. ## physics

A man whose mass is 70 kg walks up to the third floor of a building. This is a vertical height of 12 m above the street level. (a) How many joules of work has he done? (b) By how much has he increased his potential energy? (c) If he climbs the stairs in 20

26. ## Physics

A bicyclist is coasting down a road that is sloped downward at an angle of 8°. The bicycle and bicyclist have a total mass of 80 kg. If the bicycle wheels roll freely, without any effect from friction or air resistance slowing the motion, how fast would

27. ## Math

Lee Holmes deposited $15,000 in a new savings account at 9% interest compounded semiannually. At the beginning of year 4, Lee deposits an additional$40,000 at 9% intrest compounded semiannually. At the end of 6 years, what is the balance in Lee's account?

28. ## chemistry

Write a formula for the compound that forms from potassium and acetate.

29. ## consumer mathB

Your box of raisin bran cost $1.89 last year. This year it costs$2.25. What is the inflation rate?

30. ## ENGLISH

PLEASE HELP !! Identify the pronoun in the sentence below. Also identify the class and noun function of the pronoun using the abbreviations from the chart. For intensive pronouns, put NONE for noun function. 1.Robert was successful because his planning

31. ## Chemistry

Which equation does not fit the definition of oxidation? 1. Na ® Na+ + e- 2. C2H6 ® H2 + C2H4 3. C + O2 ® CO2 4. Ag+ + e- ® Ag Can some one help. I do not know which one. I am working on a practice test and there are no answers in the back of the book.

32. ## physics

A body slides down a curved track which is one quadrant of a circle of radius R. If it starts from rest at the top of the track and there is no friction, find the speed at the bottom of the track is R equals 5 m.

46. ## physics

A centrifuge is a common laboratory instrument that separates components of differing densities in solution. This is accomplished by spinning a sample around in a circle with a large angular speed. Suppose that after a centrifuge in a medical laboratory is

47. ## Algebra 2

An extruder can fill an empty bin in 2 hours and a packaging crew can empty a full bin in 5 hours. If a bin is half full when an extruder begins to fill it and a crew begins to empty it how long will it take to fill the bin?

48. ## science

On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?

49. ## Physics

On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?

50. ## Programing

write a pseudocode for a program that asks for the Employee ID, the hours worked and the pay rate, then returns the employee's gross pay for the week?

51. ## Chemistry

will acidic foods cooked in a cast iron skillet become Fe+2 enriched because of a reaction beteen the acidic food and the skillet?

52. ## chemistry

Iron reacts with superheated steam(H2O) to form hydrogen gas and the oxide Fe2O3. (write) Balance this chemical reaction. And if 10grams of Iron react with excess steam, how many grams of Fe2O3 are produced? How many grams of H gas? How many grams of H2O

53. ## English

I am writing a comparison essay how Miley cyrus song the climb argument is better than katy perry fireworks. I need help finishing my conclusion. my thesis restated is: Miley Cyrus's argument for how every person is an individual is more compelling than

54. ## math

Karen says, "When I have a factor with exactly 2 zeros at the end, my answer will always have 2 zero at the end." Do you agree? Explain. Thanks

55. ## economics

Market demand is given as QD = 200 â€“ 3P. Market supply is given as QS = 2P + 100. Each identical firm has MC = 0.5Q and ATC = 0.25Q. What is each firmâ€™s profit?

56. ## maths

write the square root of 32as a power of 2 and hence solve the equation 16to the power of x-1=2 square root of 32

57. ## Physics

You pull downward with a force of 32 N on a rope that passes over a disk-shaped pulley of mass 1.3 kg and radius 0.075 m. The other end of the rope is attached to a 0.60 kg mass. Find the linear acceleration of the 0.60 kg mass.

58. ## physical science

If a book sits on a shelf1.5 m above the floor.One frienf tells you that the book's mechanical energy is zero, and another says it is not . Who is correct?

59. ## Physics

A communications satellite with a mass of 400 is in a circular orbit about the Earth. The radius of the orbit is 3.7×104 as measured from the center of the Earth. Calculate the gravitational force exerted on the satellite by the Earth when it is in orbit.

60. ## lab math

If 0.5 ml of serum is added to 1.5 ml of saline, what is the dilution

61. ## Physics

A uniform metal rod, with a mass of 3.0 kg and a length of 1.0 m, is attached to a wall by a hinge at its base. A horizontal wire bolted to the wall 0.64 m above the base of the rod holds the rod at an angle of 40 degrees above the horizontal. The wire is

62. ## calculus

Lim (1+(a/x))^(bx) x->infinity I'm having a lot of trouble with this limit.

63. ## chemistry

How many milliliters of a 110mL solution of 1.5 M AlCl3 must be used to make 70mL of a solution that has a concentration of 0.2M Cl–?

64. ## physics

find the force of gravity between 74.0kg physics students that are sitting 85.0 cm apart

65. ## geometry

You have 32 feet of fencing and want to determine the maximum area that can be enclosed with the fencing to make a flower garden. You do not want to deal with fractions or decimals, so you are limiting the dimensions to whole numbers. Also, the area is to

66. ## Physics

A 8.0×10−2- toy airplane is tied to the ceiling with a string. When the airplane's motor is started, it moves with a constant speed of 1.30 in a horizontal circle of radius 0.49 , as illustrated in the figure . Find the angle the string makes with the

67. ## physics

A 2 kg block is pushed 2 m along a fixed horizontal surface by a horizontal force of 20 N. The coefficient of kinetic friction of the surface is µk= 0.40. (a) How much work is done by the 20 N force? (b) what is the work done by the friction force? (c)

68. ## chemistry

Given the following reaction and enthalpy change, calculate the amount of heat for converting 100.4g of liquid water (18.02g/mole) to a vapor? delta H= +44kJ

69. ## Algebra ii

A certain town is at a latitude of 35.2 degrees N. Find the distance in miles from the town to the north pole.

70. ## Physics

Find the centripetal acceleration at the top of a test tube in a centrifuge, given that the top is 4.5 from the axis of rotation and that its linear speed is 76 .

71. ## PHYSICS

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

72. ## physics

A 2kg block is placed onto a vertically oriented spring whose spring constant k is 1960 N/m. Find the distance that the spring will be compressed.

73. ## Algebra 2

A boat has a 10 gallon gasoline tank and travels at 20mi/hr with a fuel consumption of 16mi/gal when operated at full throttle in still water. The boat is moving upstream into a 5mi/hr current. How far upstream can the boat travel and return on 10 gallons

Suppose you have 168 meters of fencing with which to make two side-by-side rectangular enclosures against an existing wall. If the rectangular enclosures are adjacent and of the same depth, what is the maximum are that can be enclosed?

75. ## chemistry-light

the SI Unit of length is meter,which is defined as the lenght equal to 1,650,763.73 wavelengths of light of the light emitted by a particuar energy transition in krypton atoms.calculate the frequency of the light to three significan figures.

76. ## world history

Which group forced the Chinese to acknowledge their claim to the mandate of heaven and sign a treaty in 1127 C.E

77. ## English 10

In the autobiographical selections "Hair" and "It Can't Be Helped," the authors describe how racial prejudice affected their early lives. Identify the key event described in each of the selections. Then explain how each author responded to the event at the

78. ## english

Identify the pronoun in the sentence below. Also identify the class and noun function of the pronoun using the abbreviations from the chart. For intensive pronouns, put NONE for noun function. That was a very long phone call.

79. ## physics.pls help

The volume of a cylinder is defined by the formula V=pie R squared h. If initially have a cylinder with a volume of 10m cubed. Find the volume of the cylinder if the height doubles and if the height is cut in half. pls i really need help.

80. ## physics

a 1540 kg truck is traveling at 95 km/hr. what average force is required to stop in 10 seconds

81. ## Algebra ii

City B is due north of city A. City A has a latitude of 14.6 degrees N, and city B has a latitude of 47.2 degrees N. find the distance in kilometers between the cities.

82. ## physics

A uniform disk with a mass of 27.3 kg and a radius of 0.309 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as the drawing indicates. (b) What is the angular acceleration of the disk?

83. ## Physics

A fish takes the bait and pulls on the line with a force of 2.2 N. The fishing reel, which has a friction clutch that exerts a restraining torque of 0.048 N m, is a cylinder of radius 0.055 m and mass 0.84 kg. Part A What is the angular acceleration of the

84. ## Chem 152

if x moles of PbCl2(s) dissolve in 1.00L of water, how many moles of Pb2+(aq) are produced? how many Cl- produced?

85. ## English

HELP. How do would you annotate this? and answer the questions under the passage..??? But now, fearing death, all eyes fixed on Charybdis now Scylla snatched six men from our hollow ship, the toughest, strongest hands I had, and glancing backward over the

86. ## science, ocean currents

waste produced by people in delaware has been dumped into the atlantic ocean, where it is distributed by surface ocean currents. which coastal area is most likely to become polluted by this waste

87. ## english

Can somebody help me restate my thesis please. statement for the conclusion. My thesis is: An analysis of the literary devices in Katy Perry " Fireworks" and Miley Cyrus " The Climb" reveals Miley Cyrus creates a better argument for how every person is an

88. ## chem

A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25°C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.93 L at 25°C and 785 torr. Calculate the vapor pressure of this liquid at

89. ## math

a runner time in the 100 meter dash is 32second when rounded to the nearest whole number. Name the fastest and slowest time in decimal to hundredths.

90. ## Science

At an accident scene, 276-m long skid marks are found on the road. If the car that made these skid marks can decelerate at –9.8 m/s2, how fast was the car going before braking?

91. ## MATH....

Determine the level of the confidence given the confidence coefficient z(α/2) for the following situation: z(α/2) = 1.96

92. ## english

for my comparison essay i am analysis of the 2nd device for katy perry song fireworks.. i need help explaining this line into details. could somebody give me like at least 1-2 sentence explaining it. this is what i got so far: Perry then uses imagery when

93. ## english

my comparison essay introduction paragraph. can someone help me think of what to wrtie before the "an analysis...." i just need a general idea of what to write because im stuck. here the intro: Miley Cyrus song “The Climb” is not only one of my

94. ## Math

How are cube and a rectangular prism alike? How are they different?

95. ## University studies

According to the Center for Mathematics Excellence, which of the following is a math myth? A. Knowing the rules and how to use them is the most important part of math. B. Even people who are highly skilled in mathematics and science find these subjects to

96. ## Physics

Driving in your car with a constant speed of 12 , you encounter a bump in the road that has a circular cross-section, as indicated in the figure . If the radius of curvature of the bump is 35 , find the apparent weight of a 70- person in your car as you

97. ## confused

serigo has 30 gifts numbered from 1 to 30. There is a kite in each gift with a number that is multible of 4. There is a baseball cap in each gift with a number that is multiple to 6. Which gifts have a kite? Which gifts have a baseball ? Which gifts have

98. ## Physics

Find the linear speed of the bottom of a test tube in a centrifuge if the centripetal acceleration there is 5.1×104 times the acceleration of gravity. The distance from the axis of rotation to the bottom of the test tube is 7.7 .

A tortoise can run with a speed of 16.0 cm/s, and a hare can run exactly 25 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.00 min. The tortoise wins by 20.0 cm. (a) How long does the race take? (b) What is the

100. ## science, ocean currents

waste produced by people in delaware has been dumped into the atlantic ocean, where it is distributed by surface ocean currents. which coastal area is most likely to become polluted by this waste

101. ## Chemistry

A stock solution is prepared by adding 20mL of 0.2M MgF2 to enough water to make 80mL. What is the F– concentration of 20 mL of the stock solution?

102. ## physics

A 700-N girl jumps from a balloon 36.0 m above the ground, and is brought to rest (instantaneously) 4.00 m above the ground by an elastic cord attached to the balloon. (a) Is the girl’s acceleration upward, downward or zero at this time? Explain. (b) If

103. ## math

Write in expanded form. 7.37 Is this the correct answer? 7+3/10+7/100

104. ## Social Studies

How do you think the founders of the roman republic would have viewed the roman empire

105. ## math ( algebra 2 )

a newspaper company currently charges $11 a week to its subscribers, but is considering raising their price. the company found that the weekly revenue y can be modeled by the function y= -750(x-40)(x+20) where x is the number$.50 increases in the weekly

106. ## math

A piece of plywood is cut into strips 2 1/2 inches wide. How many strips of this width can be cut? HELP!!!

107. ## economics

A monopolist faces market demand given by P = 200 â€“ Q. For this market, MR = 200 â€“ 2Q and MC = 3Q. What quantity of output will the monopolist produce in order to maximize profits?

108. ## Math-System of Equations

1. Solve for x, y, z in the following system: 2x-3y-2=z y-x+z=1 -y-2z=7 The answers are: x=-7 y=-5 and z=-1 however I don't know how to go about this.

109. ## AP Physics b

Design a carnival ride on which standing passengers are pressed against the inside curved wall of a rotating vertical cylinder. It is to turn at most at 1/7 revolution per second. Assuming a minimum coefficient of friction of 0.10 between clothing and

110. ## Calculus

If the normal to f(x)= (3x/(1+x)) at (2,2) cuts the axes at B and C, determine the legnth of BC.

111. ## algebra 2

the perimeter of a triangle is 49 centimeters. find the lenghts of its sides, if the longest side is 9 centimeters longer than the shorter side, and the remaining side is 4 centimeters longer than the shorter side.

112. ## English Composition

What makes Z.Z. Packer's "Every Tongue Shall Confess" difference from other short stories?

113. ## sci

1. A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall from a height of 320 meter (1,050 feet). (a) How long will it take to fall? (b) How fast is it going when it hits the ground? 2. Aim the Mythbuster’s

114. ## Trigonometry

Add 3+ 4i and -4+2i graphically My class got 1+ 2 radical 10 /2 and 1-2 radical 10 /2 . whenever i put this into the y= graph, nothing shows up on the graph. Can someone tell me how to solve this algebraically and graphically?

115. ## Social studies world history

What are the similarities between the northern and middle colonies. I only have one by far seeking relgios freedom but may anyone tell me more? And some similarities if you can about southern and middle colonies. Please and thank-you!

116. ## Chemistry 121

How much oxygen would be needed to completely burn 250g of propane?

117. ## Sentences

Are my sentences correct with the following directions? (Sentences below directions) Using California as a topic, number and write one example of each of the following: 1. A completely correct simple sentence with an appositive in it. 2. A sentence with

118. ## Algebra 1

First of all, we're learning how to solve equations with variables on both sides. Write and solve an equation for the situation. An architect is designing a rectangular greenhouse. Along one wall is a 7-ft storage area and 5 sections for different kinds of

119. ## Chemistry

This question seems too simple to me but i was just wondering if someone could help me with it? 8 a) Explain why the first ionisation energy values for the Group 1 elements become less positive as you go down the group? I have done this part it's b which

120. ## Physics

When you take your 1000- car out for a spin, you go around a corner of radius 57 with a speed of 19 . The coefficient of static friction between the car and the road is 0.88. Assuming your car doesn't skid, what is the force exerted on it by static

121. ## Chemistry

9. Iron is produced by reducing iron(III) oxide with CO: Fe2O3 + 3 CO → 2 Fe + 3 CO2 ∆H = –23 kJ . How much heat is produced when 1.00 kg of Fe2O3 are reduced?

122. ## grammar

James walked to the park. Is the predicate "walked to the park" or just "walked?"

123. ## MATH

Assume that the population of heights of male college students is approximately normally distributed with mean of 72.83 inches and standard deviation of 6.86 inches. A random sample of 93 heights is obtained. Show all work. (A) Find the mean and standard

124. ## geometry

On a graph, the points (4,-2),(7,-2),(9,-5) and (2,-5) are connected in order to form a trapezoid. To the nearest tenth, what is its perimeter?

125. ## physics

A projectile of mass 0.550 kg is shot straight up with an initial speed of 22.0 m/s. (a) How high would it go if there were no air friction? I get 24.7m for this. (b)If the projectile rises to a maximum height of only 13.6 m, determine the magnitude of the

126. ## Science

How much work does the hiker do if he uses 800 n of force to walk 100 meters?

127. ## probability

One container contains 6 red and 4 white balls, while a second container contains 7 red and 3 white balls. A ball is chosen at random from the first container and placed in the second. Then a ball is chosen at random from the second container and placed in

128. ## Chemistry

I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) = 6.386e-1 Molarity of Dye= 5.322e-3 Calculate the mass percent, molarity, molality and mole fraction.

129. ## science!

1. A plane accelerated from a speed of 2.0 m/s at the rate of 3.0 m/s2 over a distance of 530 m. What is its speed after traveling this distance? 2. A jet plane must achieve a velocity of 71 m/s for takeoff. From rest and with a 1,000 m long runway, what

130. ## Chemistry 121

How many grams of KCl would be produced from the complete decomposition of 2.75g of KClO3?

131. ## physics

Suppose you need to measure the mass of an object, but have only a 7-kg standard mass and a meter stick. Place a knife edge under the 50-cm mark of the meter stick. Then put the 7-kg standard mass at the 39.1-cm mark and place the object so as to balance

How do you simplify problems like 8x + 3 (7x-6) -9(4x-8) + 2x? Please help!! Thank you!

133. ## sci

1. A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall from a height of 320 meter (1,050 feet). (a) How long will it take to fall? (b) How fast is it going when it hits the ground? 2. Aim the Mythbuster’s

134. ## Trigonometry

A ship travels S 62 E and for 48 km and then turns and travels N 28 E for 37 km.

135. ## Algebra ii

A 1.25 m long pendulum swings 5.75 degrees on each side of the vertical. Find the length of arc traveled by the end of the pendulum.

136. ## English

Can someone let me know if these answers are right? Thanks in advance! Questions 1-7 all have the same format and answer choices. The answer choices are fully explained here, but they are in shortened versions in the remaining questions. Although you do

137. ## Chemistry

n our text book the following equation is given: P=(pm - p)g * R where P is the pressure drop R is the manometer reading pm is the density of the manometer fluid p is the density of the process fluid in the pipe g is the acceleration do due to gravity Then

138. ## Math,fraction word problem

a total of 9litres of orange syrup was poured equally into 6jug. Susan poured 2over5 litres of orange syrup from a jug into a glass&drank it.she found the syrup too sweet,so she added 4over5 litres of water into the jug she had.find the total amount of

139. ## Cal 1

A trough is 10 ft long and 2.6 ft across the top. Its ends are isosceles triangles with an altitude of 2.1 ft and vertex down. Water is being pumped into the trough at a rate of 2.4 ft3/min. How fast is the water level rising when the water is 1.39 ft

140. ## physics

Your electricity usage for a one month period is 500 kilowatt-hours. Assuming one month is equal to 30 days and that the electricity usage is uniform across the whole month, what would be the velocity of a 1 kg mass if it was given the kinetic energy

141. ## Physics

A projectile of mass 0.800 kg is shot straight up with an initial speed of 28.0 m/s. (a) How high would it go if there were no air friction? (b) If the projectile rises to a maximum height of only 26.8 m, determine the magnitude of the average force due to

142. ## Mathematics

The firts terms a of an A.P is equal to twice the common difference d.Find, in term of d, the 5th term of the A.P.

143. ## Math

Which would amount to more money on December 31 of this year: $500 invested on January 1st of this year at 10% annual interest compounded quarterly; or a lump sum payment of$580? (a) the $500 investment (b) both are the same (c) the$580 lump sum (d)

144. ## Chemistry

Sorry Dr. Bob, I wsa looking for the Sucrose, not all 16 calculations. Can you help me with the Sucrose? I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) =

hello, I'm helping my son with his assignment but unsure if the answer is correct. Please help advise. Milton needs to find the product of two numbers. One of the numbers is 9. The answer also needs to be 9. How will he solve this problem? Explain. 3 x 3 =

146. ## Physics

A 6.5- bowling ball and a 7.1- bowling ball rest on a rack 0.80 apart. Part A- What is the force of gravity exerted on each of the balls by the other ball? Part B- At what separation is the force of gravity between the balls equal to 2.2×10−9 ?

147. ## Chemistry

Obtain the radius of a sphere of zinc if its mass is 0.23 mg. The density of zinc is 7.14 g/mL. The given formulas are: d=m/v v=(4/3)pi r^3

The agricultural revolution occurred at different time and in different places around the world. In most regions it happened in river valleys, as it did in the Near East. Focus your attention on the similarity of the locations of Mesopotamia and Egypt. Why

149. ## Calculus

Answer the following questions for the function f(x) = sin^2(x/3) defined on the interval [ -9.424778, 2.356194]. Rememer that you can enter pi for \pi as part of your answer. f(x) is concave down on the interval ? Please help, im REALLY stuck.

150. ## Physics

If t is 04.00s, then what is the percentage uncertainty in t^2?

151. ## Math

the time x (in days), that it takes a planet to revolve around the sun can be approximated by the equation x=0.407√(d^3),where d is the mean distance of the planet from the sun in millions of miles. It takes Venus approximately 226 days to complete one

152. ## Science

Technology has been used for centuries to study the ocean. Trace the history of one piece of technology. What do you think is the most important technology to study the ocean? And why do you think so?

153. ## science

How much potash alum is prepared by 6g Al2(SO4)3 & 1.5g K2SO4?

154. ## PLZ ANSWER CHEM QUESTION

a chemist reacted 64 grams of Ru with O2. This reaction produced 160 grams of ruthenium oxide and 4 grams of leftover O2. How much of the reactants would this scientist need to make 320 grams of the product with no leftover O2? Ru + O2 = RuO2 + O2 leftover

155. ## Algebra II

A capstan on a magnetic tape drive rotates at 3600 rad/min and drives the tape at a speed of 45.0 m/min. Find the diameter of the capstan in millimeters

182. ## world history

What was the most effective remedy for plague

183. ## Math

How many compounding periods are in a 5 year loan compounded semiannually? (a) 10 (b) 5 (c) 2.5 (d) 15 (e) 20

184. ## statistics

For a single sample t-test we don't need to know.................of the population, instead we will have access to the ............of the sample.

185. ## to Katie A A

#1 - The school subject is MATH, not "help" -- I've never heard of a school subject called help. #2 - To quote one of our very good math and science tutors: “You will find here at Jiskha that long series of questions, posted with no evidence of effort or

186. ## chemistry

calculate the quantity of heat (cal, J) required to change the temperature of 1500g water from 25C to 75C. do i have this right 1500 X 4.18J/g C X 50C = 313500

187. ## Math

Factor the trinomial. If the trinomial cannot be found, say so. 11m^2 + 14m - 16 I just want to make sure...would the answer be (11m-8)(m+2) ?

188. ## physics

The scale of a certain spring balance reads 1200 N when the spring is stretched 0.1m. (a) What is the potential energy of the spring when it is stretched 0.1m and when it is stretched 0.5 m? (b) What is the potential energy when a 50 kg mass hangs from the

189. ## help

wich of these is more heavier, 10liters of water, 10liters of oil or 10kilogrammes of gold

190. ## physics

(a)Calculate the work done by moving a 50 kg mass along each of the legs of the path shown below. What is the total work expended when going along the entire path? Show all work. Don't just state any obvious results, if any. AB= 5m BC= 10m CD= 19.14m DA=

191. ## xeco 212

I need an example of the "Price Elasticity of Demand" for my economics homework.

192. ## Algebra

x/4 - y/2 = -11/4 x/4 + y/2 = 1/4 solve the system

193. ## Chemistry 121

Is 450g of oxygen enough to burn 125g of butane according to the following equation? C4H10 + O2 ---> CO2 + H2O? show why or why not?

194. ## chemistry

a sample of iron (35.0g) absorbs 5.50J. of heat. calculate the increase in temperature that occurs

195. ## math

Dominoes pizza offers 30 different types of pizza and 9 of them contain pepperoni. what percentage of their total number of pizza types have pepperoni on it? Can someone explain to me the procedure please

196. ## Social Studies

Why did the first americans migrate to the amercias. Where did they come from and what were they following? I really don't need a huge history about this qs. I just need to write 2-3 sentences to answer this qs. Please help me I really don't get this.

197. ## College math

Can you explain to me how to write 1/3 as a percent?

198. ## Math

Use the present value formula to compute the amount that should be set aside today to ensure a future value of $2,000 in 1 year if the interest rate is 12% annually, compounded annually. (a)$ 1,776.97 (b) $1,765.89 (c)$ 1,785.72 (d) $1,786.97 (e)$

199. ## computer science 104

Create a method areaOfaTrapeziod when given a, b, and h (all doubles), will return the area (double) of a trapezoid. Use the equation pictured below In the code, i should 1. Create the prototype for the method 2. create the method 3. call it from the

200. ## Math

serigo has 30 gifts numbered from 1 to 30. There is a kite in each gift with a number that is multible of 4. There is a baseball cap in each gift with a number that is multiple to 6. Which gifts have a kite? Which gifts have a baseball ? Which gifts have

201. ## Elememtary Math

(c)squared-2c+6, for c = 4 I replaced all c's with 4 and my answer is 14. Am I correct.

202. ## chemistry

How much heat is absorbed by the calorimeter if the temperature change is 10 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?

203. ## Math

Solve the equation 40^2 + 4a = 0 What I did was 4a (10a + 1) = 0 then I'm not sure what to do next...

204. ## SCIENCE

Conservation of natural resources could include- A. the use of more renewable sources of energy B. cutting down on the use of fossil fuels C. replacing soil and planting trees D. all of the above

205. ## calculus

let f(x)= 9(x/(x-1)square)= 9x/ x square-2x+1 find the domain of f and compute the limit at each of its endpoint. then list all horizontal and vertical asymptotes

206. ## english

do anyone know where i could get information on roles and experiences of women in afghanistan (under Taliban rule) - position in society (economy, politics, religion). also from a reliable website and i am able to reference on my work cited list

207. ## chemistry

a sample of carbo (12.5g) abosorbs 888J of heat its temperature changing form 27.0 C to 127 C . Calulate specific heat of Carbon

208. ## Economics

Explain how the emergence of the global marketplace has been linked to increased integration of the world’s economies. I think globalisation is involved, how can I structure my answer? Thanks!

209. ## chemistry

how do you find how many hydrogens there would be in 2,5,6 trimethylnonane?

210. ## Physics

A football bobble-head figure sits on your car dashboard. The 83-g head of the figure is attached to a spring with a spring constant of k = 21 N/m. You are driving along a straight road when you notice a series of hoses lying across the road, perpendicular

211. ## physic

Block _____ Name ________________________________________ Date __________ Average Speed 1. In the 2008 Summer Olympics, Usain Bolt won the 100-m race in 9.69 s. What was his average speed? 2. Light from the sun reaches Earth in 8.3 min. The speed of light

212. ## Math: Intro to Proofs

Given: Let f: X -> Y be a function. Then we have an associated function f^(-1): P(Y) -> P(X), where f^(-1) (B)⊂X is the inverse image of B⊂Y. Question: Show that f^(-1) is one-to-one if and only if f is onto. [Notes: ⊂ represents subspace, I just

213. ## Stats

I'm having some trouble with a stats portion of an animal behavior lab. We have to do chi-sqaure tests to test 3 hypothesis, which are 1) percent prey captured will decline as prey group size increases 2) percent successful hunts will decline as prey group

214. ## spanish

How do you day, Tell Vicente to come back next Tuesday in Spanish?

215. ## Algebra ii

The pulley attached to the turning knob of a radio has a radius of 35 mm. How far will the needle move if the knob is turned a quarter of a revolution?

216. ## Algebra ii

Find the latitude of a city that is 1265 mi from the equator.

217. ## chemistry

a complex apparatus has heat capacity 891J/c . calculate the heat absorbed by the apparatus to change its temperature by 1.3 C

226. ## Math

Find the future amount after one year on $2,000 at 5% compounded annually. (a)$ 200 (b) $100 (c)$ 2,100 (d) $400 (e)$ 550.00

227. ## calculus

f(x)=(1+x) what is f'(x) when x=0

228. ## Equation Help

In our text book the following equation is given: P=(pm - p)g * R where P is the pressure drop R is the manometer reading pm is the density of the manometer fluid p is the density of the process fluid in the pipe g is the acceleration do due to gravity

229. ## Maths

A boy cycled from his home to a friend's house 24km away at an average speed of 16km/h. Finding his friend absent, he returned home immediatly at an average speed of 12km/h. Find the average speed I know how to find the average speed, just that I need to

230. ## chemistry

calculate the quantity of heat (J) which flows froma 125g sample of magnesium as it cools from 650K to 300K

231. ## chemistry

a sample of carbo (12.5g) abosorbs 888J of heat its temperature changing form 27.0 C to 127 C . Calulate specific heat of Carbon

232. ## calculus

Find the inflection points of f''(x)= x(x+1)(x-2)^2. Explain

233. ## Basic math

Find the median of the numbers 3, 6, 10, 12, 27, 62 How do I answer this?

234. ## geometry

what is a similiar triangle to one that has a perimeter of 16 inches and an area of 43 square inches

235. ## math

How does a constant relate to an expression?

236. ## SCIENCE

Most electricity is produced using fossil fuels. Some people think electricity should be produced using resources such as wind,water,and solar energy. Why might people have this opinion?

237. ## Accounting

Present value analysis-cost of capital National Leasing is evaluating the cost of capital to use in its capital budgeting process. Over the recent past, the company has averaged a return on equity of 12% and a return on investment of 9%. The company can

238. ## english

for my comparison essay i am analysis of the 2nd device for katy perry song fireworks.. i need help explaining this line into details. could somebody give me like at least 1-2 sentence explaining it. the device im using is imagery and the line is:“After

239. ## English

When do you use "will" to make an offer or request? 1) Will you have a sandwich? Will you do me a favour? 2) Will you want me to (is not possible) 3) I need other examples. 4) Will you have your children picked up from school(is not possible)

240. ## math146

equation for subtract the result in C form the result in A ... is it C - A

241. ## chemistry

how many hydrogens would there be in 2,5,6 trimethylnonane and how do you find them

242. ## to Ms. Sue

I would like to thank you Ms. Sue I am starting to understand Distributive property more now. I didn't really understand was because the subsitute didn't really explain it that well. So thank you!!!! :-) :)

284. ## MATH

0.11966667 round to the tenths would it be 0.120

285. ## math

tony want to be a magician but the book said she needed to learn at least 100 magic tricks. if he learns 14 tricks each week how long willit take him to learn 100 magic tricks?

286. ## Algebra 1

What is the answer to 10-3x is less than or equal to 7x? I tried the problem, but I keep getting x is less than or equal to 1. Is that right?

287. ## english

for my comparason essay. now that i have finished every paragraph except the conclusion paragraph. so far i got: Miley Cyrus’s argument for how every person is an individual is more compelling than Katy Perry’s argument to just express your self. The

288. ## math

blank times 24=B where B is less than 100

289. ## math

solve 7^(11/13) would the answer be 7^-2 don't you subtract the Poweras or is it 2/7?

290. ## math

If a shapes area is 48 cm and the perimeter is 38 cm then what does the shape look like?