1. Chemistry

Imagine that you mix 50 g of a solute with 100 g of water at 40 degree C. Classify each solute by whether it would completely or partially dissolve under these conditions. -KCl -KClO3 -K2Cr2O3 -KNO3 -NaNO3 -Pb(NO3)2 I need help understanding the

2. physics

a 75 kg person escapes from a burning building by jumping from a window 30 m above a catching net. Acceleration due to gravity is 9.81 m/s^2. Assuming air resistance is simply a constant 96 N force on the person during the fall, determine the person's

3. Chemistry

Rank the carbon-carbon bonds in order of decreasing bond length. Rank carbon-carbon bonds from highest bond length to lowest. To rank bonds as equivalent, overlap them. 1,2,3

4. chemistry

Consider a system consisting of two oppositely charged spheres hanging by strings and separated by a distance r1, as shown in the accompanying illustration. Suppose they are separated to a larger distance r2 , by moving them apart along a track. What is

5. Engineering Statistics

"A study has shown that 20% of all college textbooks have a price of $90 or higher. It is known that the standard deviation of the prices of all college textbooks is$9.50. Suppose the prices of all college textbooks have a normal distribution. What is the

6. Physics

An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. b) How far does the box travel up

"Use a 10% w/v nitric acid solution." How to prepare 10% w/v nitric acid solution? Do I just weigh 10g of conc nitric acid (65%) and dilute to 100ml with water?

8. calculus

y = (ln x)^(cos4x) Use logarithmic differentiation to find the derivative of the function.

9. trig

Given that tan B= 7/24 with B in quadrant III, find sin 2B, cos 2B, and tan 2B, using angle identities.

10. ELA HELP

leaf:spinach::root: Is it flower,carrot,tomato,and lettuce?

11. physics

The small archerfish (length 20 to 25 cm) lives in brackish waters of Southeast Asia from India to the Philippines. This aptly named creature captures its prey by shooting a stream of water drops at an insect, either flying or at rest. The bug falls into

12. Physics

A 5.0 kg wooden block is placed on an adjustable inclined plane. (For this problem, μs is approximately 0.55 and μk is approximately 0.25) a) What is the angle of incline above which the block will start to slide down the plane? b) At what angle of

13. Chemistry

You have a solution that contains 5.0 grams of oxalic acid dissolved in 150 mL of water. This solution is placed in a separatory funnel, and the 100 mL of diethyl ether is added to the separatory funnel and an extraction is performed. Use the following

14. trig

Find the exact value by using a half-angle identity. cos 22.5 degrees

15. science

A Kid applies a force of 70 Newtons to a ball over 1.1 meters.How much work did he do on the ball?

16. Algebra Question

Luisa ran 3 miles on the 3rd day of a month, and she repeated her run every 4 days for the rest of the month. What equation describes the sequence of days of that month that Luisa ran? --- I have no idea how to begin this.

17. chemistry

A 3.664 g sample of monoprotic acid was dissolved in water and required 20.27 mL of a 0.1578 M NaOH solution for neutralization . Calculate the molar mass of the acid

18. Physics

A student puts a 0.80 kg book against a vertical wall and pushes the book toward the wall with a force of 26N [R]. The book does not move. a) calculate the minimum coefficient of static friction. b) describe two ways the student could make the book

19. Astronomy

Imagine that Earth did not turn on its axis. (a) What would be true about the ecliptic? It would now define the day rather than the year. It would still be defined and could be seen from all points on Earth, but only when they faced the sun. It would still

20. statistics

A sample of 12 measurements has a mean of 20 and a standard deviation of 2. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 20 each. Find the standard deviation of the sample of 14

21. physics

Two children float motionlessly in a space station. The 20-kg girl pushes on the 40-kg boy and he sails away at 1.0m/s. What happens to the girl?

22. physics

Two speakers are separated by distance d1 = 2.40 m and are in phase. You are standing 3.00 m directly in front of one speaker. Each speaker has an output power of 1.20 W. Because the speakers are at different distances, there will be frequencies at which

23. literature

"Regular aerobic exercise gives an individual more endurance" is a sentence that shows cause and effect. Which word indicates the cause? A. Regular B. Endurance C. Exercise D. Individual

24. physics

A string of 29 identical Christmas tree lights are connected in series to a 120 V source. The string dissipates 65 W. What is the equivalent resistance of the light string? Answer in units of Ω

25. Physics

What is the period that corresponds to a frequency of 53.1 Hz? Answer in units of s

26. chemistry

calculate the volume of mL of a 1.420 M NaOH solution required to titrate the following solution. 25.00 mL of a 1.500 M H3PO4 solution

27. physics

A string is tied to a 4.4 kg block and a 120 g bucket from a pulley. Students add 20 g washers one at a time to the bucket. the students are unaware that the coefficient of static friction for the block on the table is 0.42. a) what is the maximum force of

28. Math

How to convert 215% into a fraction. Can anyone help

Consider the expected conductivities of CaCl2(aq) and Ca(OH)2(aq). Which of these can be expected to have the higher conductivity. Explain your reasoning.

30. Science (Chemistry

Write the relationship between the rate of disapperance of H2C2O4 (aq) and the rate of apperance on Mn ^2+ (aq) for the reaction represented by the following equation. 2MnO4^-(aq)+ 5H2C2O4 (aq)+6H3)^+(aq) -->10CO2(g)+2Mn^2+ (aq)+14H2) (l)

31. STATISTICS 014

1. A manager wishes to find out whether there is a relationship between the age of his employees and the number of sick days they take each year. The data is given below: Age (X) 18 26 39 48 53 58 24 50 Days (Y) 16 12 9 5 6 2 10 7 a. What is the null

32. statistics

A city survey found that 47% of teenagers have a part time job. The same survey found that 78% plan to attend college. If a teenager is chosen at random, what is the probability that the teenager has a part time job and plans to attend college?

45. physical science

during a football game two players try to tackle another player.one player applies a force of 50.0 n to the east. a second player applies a force of 120.0 n to the north . what is the total applied force?and what is themagnitude and direction of the force

46. Chemistry Help!!

sodium metal reacts violently with water to produce aqueous sodium hydroxide and hydrogen gas. calculate the enthalpy change for this reaction.

47. physics

A metal sphere has a charge of +6.4 C. What is the net charge after 4.1 x 1013 electrons have been placed on it?

54. engineering

A slotted bar is attached to the origin and rotates in the horizontal plane with a constant angular velocity of 0.665 radians/s . The bar moves a roller weighing 33.6 lb along the cam's perimeter. A spring holds the roller in place; the spring's spring

Customers arrive at Paul Harrold¡¯s styling shop at a rate of 3 per hour, distributed in a Poisson fashion. Paul a perform haircuts at a rate of 5 per hour, distributed exponentially. a) Find the average number of customers waiting for haircuts. b) Find

56. Physics

Water skiers often ride to one side of the center line of a boat, as shown in the figure. In this case, the ski boat is traveling at 15 m/s and the tension in the rope is 90 N. If the boat does 3500 J of work on the skier in 42.4 m, what is the angle θ

57. physics

A 75.0-W lamp is placed in series with a resistor and a 120.0-V source. If the voltage across the lamp is 24 V, what is the resistance R of the resistor?

58. Physics

A Federation starship (2500000 kg) uses its tractor beam to pull a shuttlecraft (10000) aboard from a distance of 7 km away. The tractor beam exerts a constant force of 25000 N on the shuttlecraft. Both spacecraft are initially at rest. How far does the

59. Shirley Jackson The Lottery

Questions plague the mind of many readers of why exactly Tessie Hutchinson was stoned in Shirley Jackson's, "The Lottery." This gruesome tale tells of an innocent woman stoned in a small village of 300 people. In doing so, the community thought that their

60. Math

The markup on a video camera should be 37 % based on selling price. If the seller paid, $390 for one, then how much should it be sold for to achieve the desired markup? (a)$ 404.34 (b) $1,054.05 (c)$ 404.43 (d) $619.05 (e)$ 534.30

61. college algebra

U is jointly proportional to V and W. Let k be the constant proportionality. If U = 4 when V = 8 and W = 6, find the value of k

62. probability

A random experiment of tossing a die twice is performed. Random variable X on this sample space is defined to be the sum of two numbers turning up on the toss. Find the discrete probability distribution for the random variable X and compute the

63. physics

Mars has a mass of about 6.8 × 1023 kg, and its moon Phobos has a mass of about 9.5 × 1015 kg. If the magnitude of the gravitational force between the two bodies is 4.66 × 1015 N, how far apart are Mars and Phobos?

64. slu

what are critical points for the function g(x)=36x-9tanx

65. Physics

You like to swim at a nearby lake. On one side of the lake is a cliff, and the top of the cliff is 69 m above the surface of the lake. You dive of the cliff doing somersaults so as to have an angular speed of 5.5 rev/s. How many revolutions do you make

66. Physic

A car is slowing down at a rate of 20 km/h/s. How far does it travel if its original velocity is 50 km/h and its final velocity is 5.0 m/s?

67. kvb

Sam hits a golf ball with a five-iron a distance of 120 m horizontally. A tree 45 m high and 35 m in front of Sam is directly in the path of the ball. Will the ball clear the tree if the ball makes a parabolic curve and has maximum height of 80 m?

68. physics

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 13 m/s. The cliff is h = 58 m above the water's surface, as shown below. (a) How long does it take for the stone to fall to the water? s (b) With what speed

69. Math

Which expression describes the area in square units of the rectangle that has a length of 10x^3y^4 units and a width of 5x^2y units?

70. english

In part 3 "Burning Bright" in fahrenheit 451 novel .What symmetry lies in rebuilding of the city? can you explain what they mean in this question ? thank you

71. Chemistry

You have a solution that contains 5.0 grams of oxalic acid dissolved in 150 mL of water. This solution is placed in a seqparatory funnel, and the 100 mL of diethyl ether is added to the separatory funnel and an extraction is performed. Use the following

72. chemitry

show that the equivalence amount of citric acid for 1.00g of sodium bicarbonate is 0.76g

73. Physics

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both reach the edge of a 7.5 m waterfall. If the spy's speed is 19 m/s and the officials' speed is 24

74. physics

a jogger runs with a veloicty of 6km/h (25 degrees N of W) for 35 min and then changes direction, Jogging for 20 min at 4.5km/h (65 degrees E of N). Using the parallelogram method for vector addition, determine the joggers total displacement and his

75. U.S. History

Control of which natural feature was the most important geographical advantage of The Louisiana Purchase

A 0.267kg ball is thrown straight up from 2.20m above the ground. Its initial vertical speed is 9.20m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time.

77. trig

Given that sin theta= 3/5 and the terminal side is in quadrant II, find tan (pi/2 - theta)

78. American Gov

The most important source of political values in the United States is probably what? Mass Media Family Religion School Local Newspaper

79. physics

TWO EQUAL FORCES HAVE A RESULTANT EQUAL TO 1 1/2 TIMES THE EITHER FORCE . AT WHAT ANGLE THEY ARE INCLINED TO EACH OTHER

80. bio-technolgy

how much MgCl2 would you use to make 200mL of a 100mM solution of MgCl2

81. College Physics

A charged particle is hanging from the side of a wall by means of an uncharged string. The wall has a negative charge producing a horizontal electric field. The particle has a mass of .01 Kg. and charge of -80(micro)C and is suspended by a string .3m long.

82. ALGEBRA SIMPLIFY

I cant figure this out 6 /2 * 8-8 /2 i got 6/2 * 8-8 /2 3*8 4 24 -4 = 20 is this right way?

83. chemistry

Calculate the molality of a 10% H3PO4 solution in water.

84. Physics....

A spacewalking astronaut with a mass of 78 kg pushes off a 540 kg satellite, exerting a 125 N force for the 0.5 seconds it takes him to straighten his arms. How far apart are the astronaut and satellite after 60 seconds?

85. chem 12

a) Calculate [H3O^+] in a 0.15M solution of benzonic acid, HC7H5O2(aq) having K of 6.4x10^-5. b) Calculate the per cent ionization of the HC7H5O2. I got.. Kb = [HC7H5O3][OH]/HC7H5O2 6.3x10^-5 x Kb =1.0x10^-14 Kb = 1.0x10^-14/6.3x10^-4 = 1.5x10^-10

86. math

Studies have shown a particular television commercial is understood by 25% of first grade students and 80% of fourth grade students. If a television advertising agency randomly selects one first grader and one fourth grader, what is the probability neither

96. trig

Find tanx if sinx = 3/4 and x is in quadrant II.

97. Math Middle School

Please help me solve this challenge problem: I love hot chocolate and coffee. I began by making one cup of hot chocolate. I drink half of my cup and then I fill the cup with coffee. I stir the new mixture and drink half of the cup and then fill the cup

98. U.S. History

Control of which natural feature was the most important geographical advantage of The Louisiana Purchase

99. math

use the quotient and reciprocal identities to simplify the given expression cot t sin t csc t sin t tan t cot t cot t sec t

100. Organic Chemistry

What is the mechanism of action between sodium benzoate (NaC6H5COO) and hydrochloric acid (HCl)? I need to know where the electrons go in this reaction.

101. physics

A golf ball is hit with an initial velocity of 50 m/s at an angle of 45° above the horizontal. How far will the ball travel horizontally before it hits the ground?

102. Physic

How long would it take a laser beam to go to the Moon and back if the distance to the Moon is 3.8 x 108 m? I know that Velocity of light is 3x10^8 m/s

103. Algebra 2

Find an equation for the linear model of the situation below and use it to make a prediction. A train is traveling north at a constant rate. At 3:00 P.M. it is 55 miles north of a city. At 4:15 P.M. it is 80 miles north of the city. If d represents the

104. Math

The half-life of carbon-14, which is used in dating archaeological finds, is 5730 yr. Assume that 100% of the carbon-14 is present at time 0 yr, or x=0. Write the equation that expresses the percentage of carbon-14 remaining as a function of time.

105. physics

a room that measures 10.o ft wide, 32.0 ft long, and 8.00 ft high needs a certain amount of air pumped into it per minute to keep the air quality up to regulations. If the room needs completly new air every 20.0 minutes, whjat is the volume of air per

106. Math

A blue jar has 25 marbles A red jar has 53 marbles .Which shows how to compare the number of marbles?

107. english

Hi, I was wondering if what i did is correct 1. Read Susan B. Anthony’s defense of her right to vote. Then, in 50-100 words, write a paragraph that paraphrases that speech. This is not the place to offer an opinion, but simply to paraphrase her opinion.

108. physics

A person pushes horizontally with a force of 170 N on a 68 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.22. (a) What is the magnitude of the frictional force? (b) What is the magnitude of the crate's acceleration?

109. U.S. History

What country controlled territory to the North of the U.S. Boundary.

168. Lifesciences

Effectsofacidrainongerminatingseeds

169. Math

A vat that have a cap to hold 45 quarts, and each bottle contains 9/21 quarts, how many bottles can be fill 45 quarts.

170. Chemistry

C3H6O + 4 O2 ¨ 3 CO2 + 3 H2O how many coefficients?

171. U.S. History

What Seaport di the United States gain Through The Lousiana Purchase

172. science

churvas mass is 66kg. find his weight on earth and on the moon.

173. Chemistry

What volume of o.410 M HNO3 would you need to neutralize 18.75mL of 0.376M Ba(OH)2? Would you do (0.410)(18.75) / 0.376? Or (0.410)(0.376) / 18.75

174. Physics

Plus 10 for each correct response and no penalty for incorrect answers. The length of a string is 996 cm. It is held fixed at each end. The string vibrates in six sections; i.e., the string has six antinodes, and the string vibrates at 190 Hz. find the

175. Math 12

(2,1) is a point on the graph of y= f (x) . Find the corresponding point on the graph of each of the following functions a) y= -f (-x) +2 b) y= f (-2(x+9))-7 c) y= f (x-2) +2 d) y= 0.3f (5(x-3)) e) y= 1- f(1-x) f) y= -f (2(x-8))

176. Physics

The coefficient of kinetic friction between a suitcase and the floor is 2.14. If the suitcase has a mass of 71.5 kg, how far can it be pushed across the level floor with 570 J of work?

177. physics

A block of mass 12.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 4.00 104 N/m. The block slides 3.00 m from the point of release to the point where it comes to rest against the spring. When the block

178. social studies

We are using the bookjourney across time 9the early ages) pg. 105 no. 22 asks "What advantage did Judah have over Israel? It shows a map the the Israelite kngdom, and I's supposed to answer it with the map. I have noclue. Can anyone help? Thanks.

179. math

what is this,? 50.0 mg of gas which occupies a volume of0.0064 L?

180. calculus

The volume V of a cylinder is computed using the values 9.8 \text{m} for the diameter and 3 \text{m} for the height. Use the linear approximation to estimate the maximum error in V if each of these values has a possible error of at most 8 \%.

181. calculus

How to factorise t3-8t2+16t?

182. calculus

How to factorise t3-8t2+16t?

183. math

a boy is blowing a spherical balloon at a rate of 50 cm3/s.at what rate is the radius of the balloon changing when the radius is 10 cm?give your answer to 2 decimal places.

184. MATH

DAN,DEBBIE,ED AND GENE WERE TRAINING FOR CROSS-COUNTRY RACING. ED RAN TWICE AS FAR AS DEBBIE. GENE RAN 8KM LESS THAN ED. DEBBIE RAN 5KM MORE THAN DAN. DAN RAN 6KM.HOW FAR DID EACH PERSON RUN? (HINT START WITH DAN'S DISTANCE AND WORK BACKWARDS)

185. MATH

AUNT ALICE GAVE EACH OF HER 3 NIECES A NUMBER OF SILVER DOLLARS EQUAL TO THEIR AGES. THE YOUNGEST FELT THAT THIS WAS UNFAIR. THEY AGREED TO REDISTRIBUTE THE MONEY. THE YOUNGEST WOULD SPLIT HALF HER SILVER DOLLARS EVENLY WITH HER SISTERS.THE MIDDLE SISTER

186. Math

Find the volume of steel required to make the beam B=108cm2 Length is 80cm

187. physics

Let the radius oh a circular segment be 110 m, the mass of the car 1508 kg, and the coefficient of the static friction between the road and tire 0.9. Find the magnitude of the normal force N which the road evers on the car at the optional speed (the

188. Science

A football player has to push a blocking sled the length of a football field. What are two ways the workload for the football player could be increased?

189. Math

consider 2 car loans A) 5.9% APR and 3,000 'cash back' B) 1.9% APR and no cash back both loans are repaid after 5 years pick any car to buy and calculate the total amount owed at the end of 5 yearrs. which loan is better choice. the car i have choosen in

190. physics

A rocket consists of a payload of 4280.0 kg and 1.626 105 · of fuel. Assume that the rocket starts from rest in outer space, accelerates to its final velocity, and then begins its trip. What is the speed at which the propellant must be expelled to make

191. chemistry

mole creative assignment RAFT writing my raft is that i am mole, i am writing to periodic table, the rap song is a form will i take and explain how to find molar mass. using theese things i have to write half page paragraph but i don't know how start my

192. Science (Chemistry

Use the experimental data below to determine the order of the reaction with respect to [Cr(NH3)5Cl]^2+(aq)+OH^-(aq)-->[Cr(NH3)5(OH)]^2+(aq) +Cl^-(aq) You must show your work for any calculations and/or sketch or include a printed graph showing how the

193. Chemistry

convert 548mL to cm3

194. physics

calculate horizontal force that must be applied to 1kg to make 6ounce to make it accelerat on horizontal friction three hour table dropped with same acceleration it would have if it and feel freely

195. trig

PERIMETER OF A RECTANGLE IS 32CM AND AREA IS 55CM FIND THE LENGHT.

196. Math

Solve two solutions. If there is a solution write it or I there isn't any write no solution. -3ly-3l = 9 (l l is absolute value sign)

197. Math

Would 48x 2/96 be considered a Mltiplicative inverse???

198. Accounting

According to the Sarbanes-Oxley Act, the responsibility for issuing a report on a company's internal controls over financial reporting rests with: A.) both the company and its independent auditor. B.) the company. C.) the independent auditor. D.) neither

287. Science

Fe(No3)3(H2o)9 what is this element ??

288. algebra find mean

find the mean median most for : -12 -2 3 7 9 10 10 i got for median 7 most: 10 mean: i got -12 + -2 = -14 3,7, 9, 10, 10 = 39 now im stuck how to get mean? can you help

289. calculus

the equation V=U^5=7sqrtW-WZ relates the variables, V,U,W,Z. differentiate with respect to T to get the wquation which relates the rates of change with respect to T?

290. Math

What does A+B+C equal if A=6,B=3 and B=C?

291. chem 12

Calculate [H3O] an [OH] for a sodium hydroxide solution having a pH of 12.5. I know this is a strong base, and i got the pH 12.5. But i don't know how to go from there.

292. ALGebra Simplify

I cant figure this out 6 /2 * 8-8 /2 i got 6/2 * 8-8 /2 3*8 4 24 -4 = 20 is this right way? 29 - (3+5) *2 +3 i got 16 is that right? 5-[6+3(-40/8) + (-2)exponent 2 i got 9 x5 = 45 + 4 = 5 -49 = -44 is that correct?

293. math

how to do 23x17

Projection

295. elements of calculus

if d^2y/dx^2= x/x^2 +1, find d^4y/dx^4

296. pre-algebra

When a baseball is hit it comes in contact with the bat for 0.001 seconds.Write that as a negative exponet?

297. Chemistry

I need to supplement 20g of magnesium. Supplement comes with 825mg/ ounce. How many mg's or ounces to get to the 20g. Thanks

298. Math

Rounded to the nearest hundred, Tim has 300 photos. How many photos could Tim have? 344, 402, 449 or 382

299. vocab

10 examples noun ending x

300. math

need to calculate total purchase price I can afford for a home. monthly income $5875. .28 x$5875.=\$1645.monthly mortgage 7.70 interest for 25years.placing 25% of my yearly income down. this is as far as I have gotten... 7.70x = 1645. 7.70x 1645 7.70 7.70

301. science

describe the process of dialysis

302. math

what is the sum of radical x- 1 and (x-1)^2 when x= 5?

303. algebra

3b+7=-2 14+h/5=2 h/5=fraction m/8+4=16 m/8=fraction 3x-1=8 35=3+5x -3+m/3=12 m/3=fraction -x-4=-20 5=-z-3

304. Math

What is 2.5 cm x 2.5 cm =

305. definition

what is a humanitarian?