# Questions Asked onFebruary 12, 2012

1. ## Chemistry

The half-life for the process 238 U --> 206 Pb is 4.5*10^9 yr. A mineral sample contains 66.0 mg of 238 U and 16.0 mg of 206Pb. What is the age of the mineral?

2. ## physics

When a 58g tennis ball is served, it accelerates from rest to a speed of 45m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44cm. What is the magnitude of the net force acting on the ball?

3. ## Physics

At an instant when a soccer ball is in contact with the foot of a player kicking it, the horizontal or x component of the ball's acceleration is 810m/s^2 and the vertical or y component of its acceleration is 110m/s^2. The ball's mass is 0.43kg. what is

4. ## Physics3

Two charged particles of equal magnitude (+Q and +Q) are ﬁxed at opposite corners of a square that lies in a plane (see ﬁgure below). A test charge −q is placed at a third corner. If F is the magnitude of the force on the test charge due to only one

5. ## Chemistry

A solution of 1.50g of solute dissolved in 25.0 mL of H2O at 25C has a boiling point of 100.95C. What is the molar mass of the solute if it is a nonvolatile non electrolyte and the solution behaves ideally. (d of H2O at 25C=0.997g/mL)?

6. ## Chemistry

A 200. gram sample of a salt solution contains 0.050 grams of NaCl. What is he concentration of the solution in parts per million? a)50. ppm b)250. ppm c)2.5 * 10^-4 ppm d)5.0 * 10^4 ppm

7. ## Physics 2

The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides. All four wires are much longer than the sides of the square. The net magnetic field at the center of the square is 91.5 µT. Calculate the current I.

35. ## statistics

Find the mean of the given probability distribution. The number of golf balls ordered by customers of a pro shop has the following probability distribution.

36. ## College Chemistry

If the density of cylinder 1 is 3.55 , what is the density of cylinder 2? (The masses and volumes of two cylinders are measured. The mass of cylinder 1 is 1.35 times the mass of cylinder 2. The volume of cylinder 1 is 0.792 times the volume of cylinder 2.)

37. ## SCIENCE

LIST TWO ENVIRONMENTAL CONDITIONS THAT MIGHT LEAD TO THE DISAPPEARANCE OF MANATEES FROM FLORIDA'S RIVERS? PLEASE HELP.

A boat which can travel at 5m/s in still water is crossing a river 200 m wide.the rate of the flow of the river is 2 m/s assumed uniform at every point in the river. Point A and B are directly opposite to each other across the river. a) If the boat leaves

39. ## electrostatic physics

Four point charges are placed at the four corners of a square. Each side of the square has a length L. Find the magnitude of the electric force on q2 due to all three charges q1, q3 and q4 for L = 1 m and q = 1.55 C. Answer in units of N

40. ## physics

a .20 kg ball on a string is whirled on vertical circle at constant speed. When the ball is at 3:00 position, tension is 16 N. a) is centripetal force acting on ball the same at each point on the circle? b) when the ball is at 3:00, what is proving the

41. ## Math

it takes Lucy 7 minues to cut a 20 yard by 1-yard roll of fabric into 14 equal pieces. How many minutes would it ake her to cut the fabric into 25 equal pieces?

An aircraft have a speed in still air of 400 km/h. A wind is blowing from the south at 80 km/h. The pilot wishes the aircraft to travel due east. Find the direction in which aircraft should be steered and the speed at which it will travel.

43. ## physics

From what distance can these light bulbs be marginally resolved by a small telescope with a 6.0 cm-diameter objective lens? Assume that the lens is limited only by diffraction and wavelength = 600nm

44. ## Physics4

2. At the point of fission, a nucleus of 235U that has 92 protons is divided into two smaller spheres, each of which has 46 protons and a radius of 5.9 × 10^-15 m. What is the magnitude of the repulsive force pushing these two spheres apart? The value of

45. ## calculus

The Revenue from the sale of x units of a product is represented by the following formula: R = 20(3x + 1)^-1 + 50x - 17 dollars. Find the Marginal Revenue when 20 units are sold?

46. ## Physics

A girl places a stick at an angle of 60.0° against a flat rock on a frozen pond. She pushes at an angle and moves the rock horizontally for 2.00 m across the pond at a velocity of 4.00 m/s and a power of 160.0 W. What force did she apply to the stick? How

47. ## Physics II

two perpendicular, long, straight wires, both of which lie in the plane of the paper. The current in each of the wires is I = 4.5 A. In the drawing dH = 0.13 m and dV = 0.48 m. Find the magnitudes of the net magnetic fields at points A and B. The drawing

48. ## Physics

Give an example of a vertical motion with a positive velocity and a negative acceleration. b. Give an example of a vertical motion with a negative velocity and a negative acceleration.

49. ## Chemistry

1) Benzene freezes at 5.45 degrees celsius. The Kf for benzene is -5.07C/m. What would be the freezing point of a 0.210m solution of octane in benzene? I am not sure how to start this. I know the equation for freezing point is Kfp * m solute.

50. ## Physics2

A particle of mass 47 g and charge 54 C is released from rest when it is 13 cm from a second particle of charge −15 C. Determine the magnitude of the initial acceleration of the 47 g particle. Answer in units of m/s2

51. ## physics

If You did 150 joules of work lifting a 120 newton backpack.A) How high did you lift the backpack?B)how muck did the backpack weigh in pounds?

52. ## Geometry

Harris is planting a rectangular garden with an area of 48 square feet . He is also putting a fence around his garden . How should hr arrange his garden so he can buy the least amount of fence?

53. ## Math

Nico is saving money for his college education. He invests some money at 5%, and $2300 less than that amount at 3%. The investments produced a total of$163 interest in one year. How much did he invest at each rate?

54. ## Chemistry 101

A bag contains a mixture of copper and lead BBs. The average density of the BBs is 9.60g/cm cubed. What is the percent of copper and the percent of lead?

55. ## SCIENCE

Two 2.6 kg physical science textbooks on a bookshelf are spaced 0.22 m apart. What is the magnitude of the gravitational attraction between the books?

56. ## Physics

An image of the moon is focused onto a screen using a converging lens of focal length f= 35.3 cm. The diameter of the moon is 3.48×106 m, and its mean distance from the earth is 3.85×108 m. What is the diameter of the moon's image?

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57. ## physics

11. You did 150. J of work lifting a 120.-N backpack. a. How high did you lift the backpack? b. How much did the backpack weigh in pounds? (Hint: There are 4.448 N in one pound.)

58. ## electrostatic physics

A particle of mass 47 g and charge 54 C is released from rest when it is 13 cm from a second particle of charge −15 C. Determine the magnitude of the initial acceleration of the 47 g particle. Answer in units of m/s2

59. ## statistics

Now, let’s look at a situation in which we compare three college math teachers to each other with respect to how interested they keep their students. The study was conducted among freshmen enrolled in an introductory course. The unit was quadratic

60. ## Chem

a solution containing 100g of unknown liquid and 900g water has a freezing point pf -3.33 C. given kf=1.86 degrees c for water, the moelcular weight of the unknown liquid is what?

61. ## Economics

Please check my work! Thanks! 1. The employees of Abs “R” Us, which includes 12 fitness parlors in and around the metro area, feel they can improve the performance of the company. They decide to pool their resources to purchase the company. This would

62. ## chemistry

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

63. ## artwork critique

this be the last one Judgement : Do you like it, and is it successful? how well you think you have done with materials used? is it original, innovative, and daring? does the artwork make you think beyond the image? is the artwork successful? how? do you

64. ## Chemistry

How many grams of water are needed to dissolve 27.8g of NH4NO3 (80.0 g/mol) in order to prepare a 0.452 m (molal) solution? 27.8g / 80g/mol X 0.452 = 0.157 Is this correct?

65. ## chemisry

A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent. 100 ml of a 0.1M solution of the above acid is titrated with 0.1 M

66. ## physics

under the influence of its drive force, snowmobile is moving at constant velocity along a horizontal patch of snow. When drive force is shut off, snowmobile coasts to a halt. a) During the coasting phase, what is the net external force acting on the

67. ## algebra

the apothem of a regular polygon is the distance from the center of the polygon to a side. Explaiin how to derive a formula for the area of a regular polygon using the apothem.

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68. ## Chemistry

Which of the following contributes to the bubbling from a cold can of soda when left standing at room temperature. Choose all that apply. 1) the initial rush of CO2 out of the can drags other CO2 molecules out of the solution. 2) the decrease in CO2

A helicopter is lifting two crates simultaneously. One crate with a mass of 151 kg is attached to the helicopter by cable A. The second crate with a mass of 79 kg is hanging below the first crate and attached to the first crate by cable B. As the

70. ## Physics1

Four point charges are placed at the four corners of a square. Each side of the square has a length L. Find the magnitude of the electric force onq2 due to all three charges q1, q3 and q4 for L = 1 m and all q = 1.55 C. Answer in units of N

A ball is thrown downwards at a velocity of 14m/s from a bridge. One second earlier a rock is dropped from the same bridge. a)When will the ball meet up with the rock. b)When will the ball meet up with the rock? c)What is the initial minimum speed by the

72. ## Physics

A 2.3 kg ball tied to a string fixed to the ceiling is pulled to one side by a force Farrowbold to an angle of θ = 26.4°. Just before the ball is released and allowed to swing back and forth, how large is the force Farrowbold that is holding the ball in

A generating station is producing 2.00 106 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.00 10-2 /km. (a) Find the power lost in

74. ## percentage

Karen took 1h 45m to drive from town a to town b.she took another 25m to drive town b to town c.after that,she drove back to town a.the journey from town a to town c and then back to town a took 3h 35m. find the percentage of the time she spent driving

asked by Da S
75. ## artwork critique

Interpretatin: what does the artwork mean? what you trying to say? who artwork intended for? you trying to teach a lesson? does artwork speak to you? how? This artwork mean to search for yourself, how you really be. Artwork intended for all people in world

76. ## Physics

A 1.26 kg block is held against a spring of force constant 2.0 103 N/m, compressing it a distance of 0.18 m. How fast is the block moving after it is released and the spring pushes it away?

77. ## Chemistry

If 38.33 mL of a standard 0.1667 M Ba(OH)2 solution is required to neutralize exactly 52 mL of H2SO4, what is the molarity of the acid solution?

78. ## physics

A car, mass - 1950 kg, accelerates at +2.33 m/s (squared). Find the magnitude of the normal force acting on the car. If later, when the car is cruising at 26.5 m/s, the driver applies a force of magnitude 10,000 N to stop the car. What is the distance it

79. ## Physics

You push a box along the floor against a constant force of friction. When you push with a horizontal force of 78 N the acceleration of the box is 0.46 m/s2; when you increase the force to 86 N the acceleration is 0.76 m/s2. (a) Find the mass of the box.

80. ## Physics

A 2.3 kg ball tied to a string fixed to the ceiling is pulled to one side by a force Farrowbold to an angle of θ = 26.4°. Just before the ball is released and allowed to swing back and forth, how large is the force Farrowbold that is holding the ball in

81. ## math

How many different rectangular prisms can be made using 36 cubes if the height is 2 cubes?

82. ## Chemistry

Calculate the moles of hexane required to form 150 g of carbon dioxide. Please show all working. Thank you.

83. ## Chemistry

How to calculate the molarity of phosphoric aci9d in a solution that is 84% by mass phosphoric acid and a density of 1.87 g/ml

84. ## physics

A car is traveling at a constant speed along road ABCDE. (Curve BC where Bis beginning of curve and C is the end of the curve is in the shape of a "backward C." C is then the beginning of another curve and D is the end of the same curve in the shape of a

85. ## Chemistry

Which aqueous solution below is expected to have the lowest freezing point? Assume 100% dissociation for ionic species. 1)0.25m MgBr2 2)0.30m Na2SO4 3) 0.50m KCl 4) 1.0m sucrose 5) 0.40m Cr(NO3)3 I think that the answer is 0.30NaSO4 but I am not positive.

86. ## Physics

A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. Pumpkin is at left of angle n is 53 degrees and watermelon is on right and at 30 degrees

87. ## Physics

A 2.3 kg ball tied to a string fixed to the ceiling is pulled to one side by a force Farrowbold to an angle of θ = 26.4°. Just before the ball is released and allowed to swing back and forth, how large is the force Farrowbold that is holding the ball in

88. ## algebra

Explain the words relation and function. Include in your explanation how the meanings of the two words differ. Give a real-world example of a relation that is not a function. Is it possible to give an example of a function that is not a relation? If so,

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89. ## physics

A tractor of mass 5000kg is used to tow a car of mass 2500kg.The tractor moved with a speed of 3meter per secound.Just before the towing rope cuts,calculate (a)the speed of the tractor immediately the rope cuts

90. ## chemistry

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

91. ## chemistry

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

92. ## Math

At a summer camp there are 60 girls and 30 boys. Twenty percent of girls and 40% of boys passed the swimming test. What percent of the campers passed. Please show working.

93. ## MATH

If 2 angles are adjacent, can it also be said they form a linear pair? Why?

94. ## linear algebra

Use an inverse matrix to solve each system of linear equations. A) x+2y=-1 B)x+2y=10 C)x+2y=-3 x-2y=3 x-2y=-6 x-2y=0

95. ## CHEM

Cl2 + SO2 + 2 H2O --> 2 Cl^1- + SO4^2- + 4 H^1+ 1) Which element is oxidized ? (simply write the element symbol; e.g. Fe, O) 2) How many electrons are lost by each atom ? (1, 2, 3) 3) Which element is reduced ? 4) How many electrons are gained by each atom

96. ## physics

An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.21 105 m/s to a final velocity of +2.29 106 m/s while traveling a distance of

97. ## Advanced Maths (Vectors) AQA Level

Triangle ABC with D, E and F the midpoints of BC, AC, and AB. G is the midpoint of AD such that the ratio AG:GD =2:1, VECtors AB =p and BC =q Prove that B, G and E are collinear. prove the same results for point C, G and G

98. ## statistics

Five independent samples, each of size n, are to be drawn from a normal distribution where sigma is known. For each sample, the interval (y-bar - 0.96 * sigma/sqrt(n), y-bar + 1.06 *sigma/sqrt(n)) will be constructed. What is the probability that at least

99. ## statistics

. A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its

100. ## Physics

The wire in the drawing carries a current of 14 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 33 A. Use Ampere's law to find the magnitude of the magnetic field at a distance of r = 1.0 m

101. ## Chemistry

How much carbon dioxide has to be bubbled into aqueous sodium hydroxide to obtain a solution containing 3.5 mol of sodium hydrogen carbonate?

102. ## math word problem

lexi and maria had $250.oo altogether. After lexi spent 2/5 of her money and Maria spent$40.00 they had the same amount of money left.How much money did lexi have in the beginning?

103. ## Chemistry

Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co-60? What is the activity of the sample in Bq?

104. ## algebra

Explain how you find ordered-pair solutions of the equation 3x - 5y =15, and then find two such solutions.

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105. ## Finance

Item Total assets $10,000,000 Total equity (all common) 9,000,000 Total debt 1,000,000 Annual interest 100,000 Total sales$25,000,000 EBIT 6,250,000 Earnings available for common stockholders 3,690,000 I am trying to find the values for the: (1) Operating

125. ## physics

A circuit consists of a 12.0 V battery connected to three resistors 44 ohms, 15 ohms and 120 ohms in series. A)Find the current that flows through the battery. B)Find the potential difference across the 44 Ohms resistor. C)Find the potential difference

Two ships, A and B st out from port O simultaneously. A travels due north at 16 km/h, B due east at 13 km/h. The ships radio have a rang of 120. For how long would they remain in contact if B had travelled north-east

127. ## math

My niece has asked me to help with a math project. Maybe I am putting too much into it but I do not understand it. Any help would be great. It is a "Tissue Box Project". Any ideas?

128. ## Physics

A horizontal wire of length 0.48 m, carrying a current of 6.8 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 19° it experiences a magnetic

129. ## chemistry

In the reaction of N2 and H2 to produce NH3, how many moles of N2 will produce 25.9 moles NH3?

130. ## science

Compare optical telescopes and radio telescopes. What are the advantages of using a radio telescope over an optical one? All I can think of is, that radio telescopes can be used in any form of weather and optical telescopes can't. I'm not sure if that is

131. ## FACS Project Help!

I have this project for facs (family and comsumer science) and I really need help. UNIT: Personal Development Topic: The One & Only You! Lesson: The UNIQUE you! Review Question Due Date: 2/15/12 1. Identify - What are four (4) influences that give you a

132. ## chemistry

A student is given 3 beakers: Beaker 1- 50.0 ml of a solution produced by dissolving 6.00 grams of a weak monoprotic acid ,HX, in enough water to produce 1 liter of solution. The empirical formula of HX is CH2O. The solution contains 3 drops of

133. ## math

mr spoke is a salesman at pop's cycle shop. each month he earns 800 plus 7% of his total monthly sales. how much did he earn last month if his sales totalled 9200

134. ## PHYSICS CAN ANYONE HELPPPP PLEASE

A crow sits on a clothesline midway between two poles as shown. Each end of the rope makes an angle of θ = 28° below the horizontal where it connects to the pole. If the combined weight of the crow and the rope is 11.1 N, what is the tension in the rope?

135. ## math

Math question. Two part. A am rifle bullet accelerates from 0 to 1000 m/s ( about 2240 MPH) in 1/1000 second when fired. What is the avg acceleration of the bullet in m/s2? If this rate of acceleration could be somehow maintained, how long would it take

136. ## 6th grade science

why would a shredded carrot turn the softest when it is sitting on top of a table out in the open air compared to the carrot in water and the carrot in salty water?

137. ## POETRY

Who is the intended audience for the poem Flesh and Spirit by Anne Bradstreet? I also need an example of contemporary relevance for the poem. Help please?

138. ## Math

A test has 125 items. Each correct answer earns 1point and 65% is a passing grade. If you get 42 answers wrong will you pass? Show working

139. ## math

A triangular pyramid has a triangle base of 24 cm, triangle height of 16 cm, and a pyramid height of 14 cm. what is the volume of triangular prism.

140. ## Physics

A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. Pumpkin is at left of angle n is 53 degrees and watermelon is on right and at 30 degrees

141. ## Physics

A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. Pumpkin is at left of angle n is 53 degrees and watermelon is on right and at 30 degrees

142. ## algebra

The temperature F, in degrees Fahrenheit, that corresponds to a temperature C, in degrees Celsius, is given by the equation F = (9/5)C + 32. If you graph this equation for 0 < (the sign has a _ below it to mean or equal to) C < (the sign has a _ below it

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143. ## PHYSICSSSSSS help please

A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a

144. ## economics

For the total variable cost (TVC), draw a positive total fixed cost (TFC) and total cost (TC) curves. Then derive the associated marginal cost (MC), average total cost (ATC), average variable (AVC) and average fixed cost (AFC) curves. Be sure to capture

145. ## Gov

I'm still struggling with the following questions as I received help before: 1) Explain Obama's administrations stance on net neutrality.. from what I read I think he's for it 3) Why didn't the FCC's ruling cover wireless providers? can I have a specific

A bill for a meal is $10.38 including tax. Find the total cost if the customer leaves a 15% tip. asked by Devon 147. ## SCIENCE2 WHY IS THE MANATEE CLASSIFIED AS AN HERBIVORE? PLEASE HELP ME WITH THIS ONE TOO! asked by KAYLA 148. ## Chemistry Determine the grams of hexane that will react exactly with 22 g of oxygen. Show all working please. Thank you. asked by Megan 149. ## chemistry Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH asked by Laura 150. ## Please Helppp Quickly PHYSICSSSS A crow sits on a clothesline midway between two poles as shown. Each end of the rope makes an angle of θ = 28° below the horizontal where it connects to the pole. If the combined weight of the crow and the rope is 11.1 N, what is the tension in the rope? asked by Anonymous 151. ## English When do you use the past participle: had had, had have, had has? asked by Anonymous 152. ## math A girl cycles from her house to a friend’s house at 22 km/h and home again at 26 km/h. If the round trip takes 54 min, how far is it to her friend’s house? Round your answer to the nearest 0.1 km. [ asked by Ben 153. ## English What is a narrative essay? What else besides the recap of? asked by Josephina 154. ## PHYSICSSSS A train engine pulls out of a station along a straight horizontal track with five identical freight cars behind it, each of which weighs 88.0 kN. The train reaches a speed of 13.0 m/s within 6.50 min of starting out. Assuming the engine pulls with a asked by Anonymous 155. ## PHYSICSSS Two boxes with different masses M1 = 1.8 kg and M2 = 2.6 kg are tied together on a frictionless ramp surface which makes an angle θ = 21° with the horizontal (see the figure below). What is the tension in the rope connecting the two boxes? N What is the asked by Anonymous 156. ## Physicssss please help A helicopter is lifting two crates simultaneously. One crate with a mass of 151 kg is attached to the helicopter by cable A. The second crate with a mass of 79 kg is hanging below the first crate and attached to the first crate by cable B. As the asked by Anonymous 157. ## Physics Car A passes a light post moving at 25m/s and continues at this speed. Two seconds later, another car passes the light post moving at 40m/s. Assuming no acceleration of either car. a)How much time will it take for the second car to catch up with the first asked by Coco 158. ## Physics II A copper rod of length 0.83 m is lying on a frictionless table (see the drawing). Each end of the rod is attached to a fixed wire by an unstretched spring whose spring constant is k = 79 N/m. A magnetic field with a strength of 0.13 T is oriented asked by Mareena 159. ## SS7R Question/Help! (plz read) The American Revolution From 1763 through 1776 the American colonies sprit of rebellion was escalating. After a long period of being ignored, England put harder rules over the colonist. Economic, political, and social factors made the colonist take steps asked by Laruen 160. ## Physics A box is being with a velocity v by a force P (parallel to to v) along a level horizontal floor. the normal force is Fn, the kinetic frictional force if fk, and the weight of the box is mg. Decide which forces do positive, zero or negative work and why? asked by Nilan 161. ## physics A satellite is in a circular earth orbit that has a radius of 6.63E+6 m. A model airplane is flying on a 16.4 m guideline in a horizontal circle. The guideline is nearly parallel to the ground. Find the speed of the plane such that the plane and the asked by Anonymous 162. ## English Thank you very much. By the way, what do you think of our Comenius project? Do you think we did a good job? I still have a few setences on phrasal verbs I'd like you to check. (especially the reprhase of 1) 1) I can't understand the various meanings of asked by Henry2 163. ## math Please show me how to set this up and how to solve: A ribbon with straight edges has an area of 24 inches squared. Its width is x and its length is 2x + 13. What is the width of the ribbon in inches? asked by Jane 164. ## chemistry a. A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent. b. 100 ml of a 0.1M solution of the above acid is titrated with asked by billy 165. ## physics For a spring block system M=2.72*10^5kg frequency 10.0 hertz and amlitude 20.0cm (a) What is E (b) What is the block speed at its passes the equlibrium point. asked by Ghazala shoaib 166. ## Math How do I set this up and how do I solve: The sum of two numbers is 20 The difference between 3 times the larger number and twice the smaller number is 40. What is the larger number? asked by Jane 167. ## geography 1. Sofia is the capital of what European nation? Bulgaria 2. Find the Nile River in Africa. What two cities are located near its Delta? Cairo and Alexandria 3. What large island is found off the coast of southern Labrador? Newfoundland 4. What is the asked by Reed 168. ## maths in figure m // n and angle l and 2 are in the ratio 3:2 determine all the angles from 1 to 8 asked by mallavarapu 169. ## math If a metal ball is thrown downward with an initial velocity of 22 feet per second (15mph)from a 100 foot water tower, it's height h in feet above the ground after t seconds is modeled by h(t)=-16t^2-22t+100 Determine when the height of the ball is 62 feet. asked by alex 170. ## function with a radical expression f(x)=6 fx)=20+2x^2 all under a square root symbol 6=20+2(36) 6=the square root of 92 will someone help me asked by luckybee 171. ## geometry area of a triangle is 50 centimeters and the base is 4 times the height what is the height? asked by karyssa 172. ## Chemistry If very small concentrations of NaCl and AgNO3 are mixed, no precipitate forms. However, if large concentrations are mixed, a white precipitate forms. Can someone tell me a method for testing the hypothesis that "insoluble" salts would dissolve to some asked by Sarah 173. ## math how long is the diagonal of a piece of paper that is 8.5 in by 11in asked by Anonymous 174. ## chemistry/check please 1) Oxygen and boron are in the same period . When they form a compound----- is written first.Phosphorus and arsenic are the same group. When they form a compound------is written first. A) oxygen/phosphorus B)oxygen/arsenic C)boron/phosphorus asked by nick 175. ## chemistry/help 1) Oxygen and boron are in the same period . When they form a compound----- is written first.Phosphorus and arsenic are the same group. When they form a compound------is written first. A) oxygen/phosphorus B)oxygen/arsenic C)boron/phosphorus asked by nick 176. ## physics a force of 625 N is used to move an object with 1000N resistance up inclined plane of 2.0 m.What is the length of the inclined plane asked by Lee 177. ## law can somebody who has done LLB advice me on studyn for da first year exam in may..i fear cz i was not really in touch n i doubt whethr i can score well for all 4 subjects(criminal/contract/constitution/english legal system) pls advice me how to pass all asked by ruwangi 178. ## Math why might Pa^t and Pe^rt not produce the same answer? Thank You asked by WaShu 179. ## English I urgently need you to check this sentence. Thank you. 1) In section F.4 concerning "integration into ongoing activity" our coordinating partner mistakenly wrote that our tenth classes instead of our eleventh classes, which correspond to the third classes asked by Henry2 180. ## chemistry A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent. asked by ashley 181. ## Math State the equation of the line passing through the points (7,-1) and (2,2) a) 5x+3y-16=0 b) -5x-3x-16=0 c) -3x - 5y - 16=0 d) 3x + 5y-16=0 ------------------------------------ Is letter D correct? asked by Jake 182. ## electrostatic physics An uncharged molecule of DNA (deoxyribonucleic acid) is 2.15 m long. The ends of the molecule become singly ionized so that there is a charge of −1.6 × 10^−19C on one end and +1.6 × 10^−19C on the other. The helical molecule acts like a spring and asked by jc 183. ## Math Let f(t) be an exponential function with f(0) = 11 and f(4) = 59. Use the form f(t) = Pa^t to find an equation for this exponential function? What is the Value of P and A? Thanks! asked by Andy 184. ## Math 117 Use rational exponent to write 4 cube root x multiply by 6 cube root 6x as a single radical expresion. asked by Joseph 185. ## statistics A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its statistical asked by John 186. ## Advanced Maths (Vectors) AQA Level Triangle ABC with D, E and F the midpoints of BC, AC, and AB. G is the midpoint of AD such that the ratio AG:GD =2:1, VECtors AB =p and BC =q Prove that B, G and E are collinear. prove the same results for point C, G and F asked by Jat 187. ## statistics A professor teaches two different subjects (history and sociology) in an ethnically diverse college. She wants to know how much interest students have in prominent political figures. She reasons that knowing this will help her plan for future lectures. She asked by John 188. ## math A car is traveling at 120 km/h. How far does it travel in 6 1/3 hours? asked by Tori 189. ## science Given that Antarctica is roughly semicircular with a radius of 2000 km and has an average ice thickness of 3000 m. a) How many km3 of ice does Antarctica contain? b) Assuming all the ice melts, how much will this raise sea level (ignoring that the Earth asked by bibi meeble 190. ## English I included an introduction to 18th-century novels (is it correct?) + the features of Defoe's novels. Thank you. 1) Structure of his novels His novels are fictional autobiographies always pretending to be true stories. 2) They are preceded by a preface by asked by Henry2 191. ## math Q=3x^2+4y^2 if x+y=7 what is minimum value for Q. I have absolutely no idea how to solve this problem. asked by summer 192. ## communication Can anyone explain to me what the meaning of "communication phenomenon" exactly is? Thankssss! asked by maria 193. ## Biology How are soldier crabs useful to us and what things are humans doing to wipe them out? asked by Jason 194. ## Chemistry Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co-60? What is the activity of the sample in Bq? asked by gary 195. ## Chemistry Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr. How many beta particles are emitted in 190s by a 3.10mg sample of Co-60? What is the activity of the sample in Bq? asked by gary 196. ## Chemistry You dissolve 5 g of calcium hydroxide in 2 liters of water. What is the molarity of the hydroxide ions in this solution? What is the molarity of the calcium ions in this solution? asked by Amanda 197. ## English I need to write sentences using specific phrasal verbs. I need to knwo if they are possible and supply the equivalent in formal English. I havent' found the meaning of "let on to" Does it exist? Thank you 1) One boy had let off a firework in class. Many asked by Henry2 198. ## physics Determine the force required through A for the system to remain in static equilibrium in the horizontal (not moving side to side). The forces at B and C are 40 N and 90 N, respectively asked by Anonymous 199. ## Algebra Write an equation for the ellipse that satisfies the set of conditions. endpoint of major axis at ( 0, 10) and (0, -10) foci at (0, 8) and (0-8) Please help, I really don't understand how to do this asked by Beth 200. ## PHYSICS IS THERE ANYONE WHO WUD HELP PLEASE A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. Pumpkin is at left of angle n is 53 degrees and watermelon is on right and at 30 degrees asked by Anonymous 201. ## is this correct?- math find the domain of the real valued function; f(x) = sqrt(5 - (sqrtx)) my solution: 5 - (sqrt x) >=0 -(sqrt x) >= -5 (sqrt x) asked by HARRY 202. ## refining If I have a solution of gold chloride, is there a was I can grow metalic gold crystals to recover the gold instead of using sulfer dioxide to drop the gold as poeder? asked by art 203. ## english i need to chose at least 8 songs and how they relate to romeo and juliet acts so i can make a soundtrack. thanks asked by sam 204. ## Healthcare I have to do an assignment on Trends and Consumerism in Healthcare. What is a topic that I can do for this assignment? Please help I am Lost. asked by DonnaK 205. ## Engineering The angular velocity of a rigid body rotating about an axis of rotation is w = 5^i + 2^j - 4^k rad. per. sec. Determine the linear velocity of point B on the body with a position vector r = 3^i - ^j + 3^k ft. directed from a point on the axis of rotation. asked by Aaron 206. ## Calculus find the area under the curve y = x^2 + x from the origin to the line x = 3 asked by hank 207. ## math Solve by factoring: 12 w(squared) = 28w +5 asked by Jane 208. ## English Thank you very much. Here is the second list of verbs I'd like you to check.I'd also need to rephrase each sentence using a verb which is not phrasal. Can you please help me? 1) A long strike threatened to bring down the Government 2) I’m sure this asked by Henry2 209. ## algebra -3 > x > 5 as the inequality that represents the real numbers less than -3 or greater than 5. Explain why this is incorrect. asked by lucy needs help now 210. ## statistics Assume that the population of heights of female college students is approximately normally distributed with mean m of 66 inches and standard deviation s of 4.00 inches. Show all work. (A) Find the proportion of female college students whose height is asked by Tiffany 211. ## Math A 3 digit code can be made using the numbers 6,7,8,9, or 0? If repetition is not allowed, how many different codes are possible? asked by Wendy 212. ## Physics If a total mass of 11.1 kg falls 5.23 m and all of the mechanical energy is converted to internal energy, by how much will the internal energy of the water increase? The acceleration of gravity is 9.81 m/s 2 . Assume no energy is transferred as heat out of asked by Joe 213. ## English I left out two sentences I need to write in an email. 1) I wrote to the two Irish school's principals you suggested (to me) but none of them replied to my email. 2) As I would really like to start a school exchange programme with an Irish school in your asked by Henry2 214. ## phi 103 All dogs hate cats. Sirius is a dog. So Sirius hates cats" is an example of a asked by Jason 215. ## science 1. If a baseball is thrown 30 m/s backwards from a truck moving forward 50 m/s, how fast will the ball strike the glove of a ground-based catcher? asked by Anonymous 216. ## percentage Sharil is cycling from his house to Jeju Island,which are 15km apart.If Sharil has cycled a distance of 9.5km,what percentage of the total distance does he have left? pls round off ur answer to 1 decimal place asked by Da S 217. ## physics differentiate between density,mass and volume. state a formula in terms of mass density and volume. using the formula calculate the volume of a 10kg block of ice asked by john 218. ## chem what are three different situations in which the diffusion of gases is desired or not desired. what could you do to increase the rate of diffusion(for a desired gas) or slow the diffusion( for an undesired gas)? asked by skye 219. ## percentage Amit bought a pair of pants for 45$.he had to pay 7% GST. a)how much GST did Amit pay? b)how much did Amit pay for the pair of pants?

asked by Da S
220. ## english

i need to chose at least 8 songs and how they relate to romeo and juliet acts

221. ## english

i need to create a eight song soundtrack and how they relate to romeo and juliet play.

222. ## artwork meaning

i make shattered image in art, but what shattered image mean? does it have meaning? i thought maybe it mean search for yourself.

A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. (a) Find the accelerations of the pumpkin and the watermelon. Specify magnitude and

224. ## PHYSICSSSSS helpppp please

Two boxes with different masses M1 = 1.8 kg and M2 = 2.6 kg are tied together on a frictionless ramp surface which makes an angle θ = 21° with the horizontal (see the figure below). What is the tension in the rope connecting the two boxes? N What is the

225. ## algebra

please check and correct if needed. thanks problem: you have coupon of $50 off your telephone purchase of$100 or more at bell store. a. write a function relating phone purchase price after coupon, y, to the retail price, x . give the domain of this

226. ## math

how long is the diagonal of a piece of paper that is 8.5 in by 11in

227. ## math

how long is the diagonal of a piece of paper that is 8.5 in by 11in

228. ## ms. sue

ms. sue i write question in other post.

229. ## Logics

Logicians regard the following as the meaning of the word "argument." (Points : 1) a. A hostile and emotional dispute b. A poetic tribute to Spring c. A set of reasons put forth to support a claim d. The kind of thing one has with a spouse

230. ## algebra

make five sets of balanced equations for the number 20:

231. ## science

A force of 2000N is used to push a box up an inclined plane that is 5m long. If the 100 kg box is raised to a height of 8m, how much work is done against friction? Let g equal 10 m/s2; I need to know how to set the problem up

232. ## Calculus

Could someone help me with this question. Determine what limit would be represented by the following graph. imgur dot com/bceWN I am not sure if it has open dot or closed but what would the equation be for open and closed dot?

233. ## Social Studies 7R - DBQ Essay

I have this assignment for my social studies class. We have to write a DBQ essay on the American Revolution. We had done the documents for homework and go over it as a class. Here are the tasks below: 1. Identify and discuss two causes of the American

234. ## ece

words are: A)convenient communication shortcuts B)not arbitrary symbols C)unique to each individual in english D)thoughts written down I chose b is this correct

235. ## Engineering

A force of 26 lb. acts through a point (4; 5; -7) ft. and is equally inclined to the positive ends of the orthogonal axes. What is the moment of this force about the origin So i'm assuming vector r is 4i+5j-7k? And using the fact that cos^2α + cos^2β +

236. ## math

divide 1 yd 4 in. by 5

237. ## Statistics

A manufacturer of a low-tar cigarette claims that their cigarettes contain an average of 16.3 mg of tar with a standard deviation of 3.1 mg per cigarette. How many sample cigarettes must the manufacturer observe to be 99% confident that the width of the

238. ## Phsyicsssss helppp

A 9.5-kg watermelon and a 7.2-kg pumpkin are attached to each other via a cord that wraps over a pulley, as shown. Friction is negligible everywhere in this system. (a) Find the accelerations of the pumpkin and the watermelon. Specify magnitude and

239. ## Science

Can anyone please suggest a food chain which includes a soldier crab starting from the sun (in a marine environment)?

240. ## Science

what are contrasts between a marine and estuarine environment?

241. ## follow up from before

Is there some reason as to why nobody has addressed my financial accounting post from Saturday, February 11, 2012 at 5:45pm?

242. ## Chemistry

Is there any way to increase the ionic strength of a solution without increasing the pH?

243. ## ece

It is likely that a preschooler who learns to read early: A) will watch a lot of tv B) will enjoy playing outdoors as do other children C) will watch less tv than other children D)will enjoy playing outdoors as do other children and will watch less tv than

244. ## Languages

How do you say the word "love" and "kind" is many languages. (the language doesnt matter, a list would be great)

245. ## my quetion earlier was NOT answered

I'm still struggling with the following questions as I received help before: 1) Explain Obama's administrations stance on net neutrality.. from what I read I think he's for it 3) Why didn't the FCC's ruling cover wireless providers? can I have a specific

246. ## Calculus

Find the derivative y = 3x+2/x+1

247. ## Calculus

I think I wrote it wrong earlier it should be Find the derivative y = (3x+2)/(x+1)

248. ## Math

What is the perimeter of a triangle 46m 36m and 9.5

12a2+8a-15

250. ## physics

If a particle were to move from position A to position b in 0.5s, what would be its rotational (angular) velocity? If the motion is uniform (constant speed), what would be its magnitude of the acceleration?

251. ## algebra

A certain toilet tank can be emptied in 6 sec through its drain when it is flushed. This happens at the same time that the water is flowing in through the inlet pipe. Withthe drain closed, the inlet pipe canfill the tank in 30 sec. How long would it take

252. ## English

Here are the other phrasal verbs I need you to check (tell me of they are possible or of other are more often used) and which I also have to rephrase. Thank you very much! 1) Get your clothes off: they are all wet. 2) Get all that mess off your desk. I

253. ## math

What conjectures/predictions can you make about polynomial functions whose highest exponent is 6, or 7?

254. ## Calculus

On what interval is the function f(x)=x^2-6x+8 is increasing?

255. ## chemistry

Given density of Mercury, 200.59....how do I calculate for the mass of 33.5mL

256. ## amer lit

how does the song dirty little secrets by the all american rejects apply to the scarlet letter

257. ## geometry

The lengths of three sides of a triangle are given. Describe each triangle as acute. right. or obtuse. square root 5, 3, square root 14.

258. ## Geometry

The lengths of three sides of a triangle are given. Describe each triangle as acute. right. or obtuse. 5, 6,10.

x^-7x-8

x^-7x-8

261. ## 4th grade math

How could you find the measurements of the garden with a perimeter of 60 feet and the greatest possible area?

262. ## english

how do i create a eight song soundtrack

263. ## calc helppppp

use limits to find and verify all asymptotes in the graph y= sqr root (5+x^2)/(3-x)

264. ## Maths

In a triangle ABC, AD is the altitude and AD = 10 cm and CD = 10 sqrt 3 cm, determine angle A ?

265. ## science4

Last one i swear.... If the manatees were able to make 3 adaptions to their body or way of life for their survival, what would they be?

266. ## math-measurement

Subtract 1 foot 7 inch from 2 feet 2 inches

267. ## math

Subtract 1 ft 7 in. from 2ft. 2in.

268. ## Spanish

Answer in complete sentences. Te gusta más comer el desayuno o el almuerzo? ¿Por qué? My answer: Me gusta más comer el desayuno porque es nutritivo y bueno.

269. ## English

What are some culture collisions in the play othello by shakespere? i got one: color but i am stuck thank you

270. ## math-measurement

Multiply 2 yards 1 foot by 8

271. ## geometry

I need help to graph the circle 4x^2+4y^2+16x-32y+71=0 Graph the circle

272. ## math

convert units in the customery units of measure 5yd 2ft = ? yd i got 5.67 yard

273. ## ece

preschoolers use private speech: a)to influence others b)to keep some of their ideas a secret c)because it is more efficient d) because it enables them to communicate new ideas

274. ## math

5 inches by 7 inches, and the box must be at least 4 inches tall. What is the least possible volume of a box, in cubic inches, that meets these requirements?

275. ## ELA

We have to do something about dogs Name brands of dog foods

determine the domain of the real valued function f(x) = sqrt(5 - (sqrtx))

277. ## math-measurement

How do i multiply 2 yards 1 foot by 8

278. ## Pre-Calc

Write a Sinusoidal function for the following. A ferris wheel is 100 feet in diameter and makes one revolution in 45 seconds. If the rider needs to walk up a ramp to get to their seat that is 5 feet above the ground, write the model for the rider.

279. ## grammar

Is audience a pronoun, or just a noun? Can "yourself" be a demonstrative or Indefinite pronoun?

280. ## Math

Let N(t) be the number of bacteria after t days. Then N(t) = Pa^t for some constants P and a. Measurements indicate that N(4) = 5600 and N(8) = 362, 000. a. Before working the problem, estimate the value of N(7), the number of bacteria at noon on the

281. ## Chemistry

What is the mass of a solution that has a volume of 0.100L and a density of 1.07g/ml. Find in grams and In kilograms.

282. ## Biology

In ion exchange chromatography, why do you have to be careful not to disturb the resin bed or let air enter the resin bed? I get that it disturbs resolution.. but I'm not sure exactly what to say.

283. ## statistics

An art professor was interested in seeing what size group is best to prime the pump so to speak to encourage strangers to gather together in front of various exhibits at her art show, so she set up an experiment. In a municipal building off campus, she

284. ## Math 117

Use rational exponent to write 4 cube root x multiply by 6 cube root 6x as a single radical expresion.

285. ## ELA

Names of dog foods with artificial flavors

286. ## Electrical and electronic

What is a system characteristic and how does it relate to the compensation ?

287. ## math-measurement

divide 3 gallons by 4

288. ## Math 117

The formular r= 2 cube root5L can beusedto approximate the speed r,in mile per hour,of a car that has skid marks of lenght L,in feet. How far will a car skid at 60 mph.