1. chemistry

Consider the following reaction: Na2CO3 + NiCl2 ¨ NiCO3 + 2NaCl Using the solubility rules determine the solubility of all reactants and products. Explain your answer Please. Which product is the precipitate in this reaction? Write the complete ionic

2. Math

A forest ranger in a 140-foot observation tower sees a fire moving in a direct path toward the windmill by the lake. The angle of depression to the fire is 3°, and the angle of depression to the windmill is 8°. To the nearest foot, how close is the fire

3. Chemistry

Consider this equilibrium process at 686°C. CO2(g) + H2(g) CO(g) + H2O(g) The equilibrium concentrations of the reacting species are [CO] = 0.050 M, [H2] = 0.045 M, [CO2] = 0.086 M, and [H2O] = 0.040 M. (a) Calculate Kc for the reaction at 686°C. (b) If

4. Chemistry

This question has been bugging me for a long time. A rock contains a Pb-206 to U-238 mass ratio of .145 to 1.00. Assuming that it did not contain any Pb-206 at the beginning of its formation, determine its age. I assume from the other problems in my book

5. Physics

A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

6. chemistry

2.8% hydrogen, 9.8% nitrogen,20.5% nickel, 44.5% oxygen, and 22.4% sulfur determine empirical formula for compounds

7. Chemistry

What is(are) the precipitate(s) that form when K2SO4, BaCl2, and AgNO3 solutions are mixed?

8. Physics

A standard biological microscope is required to have amagnification of 200. 1)When paired with a 10 eyepiece, what power objective isneeded to get this magnification? Assume that the length of thetube of a standard biological microscope is 15 . 2) What is

9. chemistry

I have a problem like this: CHCl3 + Cl2 = CCl4 +HCL This is the rate table: CHCL3 Cl2 Initial Rate .010 .010 .0035 .020 .010 .0069 .020 .020 .0098 .040 .040 .027 They want me to find the rate constant and the rate law.

10. math

find the area of the shaded region in the figure assuming the quadrilateral inside the circle is a square. x^2+y^2=36 (the picture is of a square inside a circle on a coordinate plane)

11. Science

A race car, moves at a constant speed around an oval track. Is the car accelerating? Why or why not?

12. Geometry

Mike and Lani stand 21.2 meters apart. From Mike’s position, the angle of elevation to the top of the Eiffel Tower is 40°. From Lani’s position, the angle of elevation to the top of the Eiffel Tower is 38.5°. How many meters high is the Eiffel Tower?

A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

14. The Bet by Anoton Chekhov

The "end" of the story begins after the jurist leaves his confinement in "The Bet" by Anton Chekhov...true or false?

The breaking strengths (say, y) for one foot square samples of a particular synthetic fabric are approximately normally distributed with a mean of 2280 pounds per square inch and a standard deviation of 10.6 psi. a) find the probability of selecting a 1

16. Chemistry

Consider the heterogeneous equilibrium process shown below. C(s) + CO2(g) 2 CO(g) At 700.°C, the total pressure of the system is found to be 3.87 atm. If the equilibrium constant KP is 1.52, calculate the equilibrium partial pressures of CO2 and CO.

17. chemistry

Calculate the change in entropy (ΔS˚) of reaction (J/K) for the equation as written. BaCO3(s) → BaO(s) + CO2(g) Table: S° (J/(K mol)) BaCO3(s) = 112 BaO(s) = 70.3 CO2(g) = 213.7 So the answer is -41.7 I thought to find the entropy of reaction you

Determine two angles between 0°and 360°that have a secant of -4. Round your answers to the nearest degree. There are tw answer 104°( I got this one but there is also 256° I don't have anyidea for this one please explain to me I appreciate your time

19. Economics

A \$90,000 investment is made. Over a 5 year period, a return of \$30,000 occurs at the end of the first year. Each successive year yields a return that is \$3,000 less than the previous year's return. If money is worth 5 percent, use a gradient series factor

20. chem

Body temperature is about 308K. On a cold day, what volume of air at 273K must a person with a lung capacity of 2.00 L breathe in to fill the lungs?

21. Math Analysis

what are the two critical points for r=4cos( 4(theta)) and its symmetries. As well as for r=2+2sin(theta)?

22. physics homework

You throw a 20 N rock into the air from ground level and observe that when it is 1 5.0 M high, it is traveling upward at 25.0 m/s. Use the work energy principle to find (a) the rock’s speed just as it left the ground and (b) the maximum height the rock

23. Physics

An animal-rescue plane flying due east at 33.0 m/s drops a bale of hay from an altitude of 58.0 m. If the bale of hay weighs 173 N, what is the momentum of the bale the moment it strikes the ground?

24. Physics

A femur is a bone in the leg whose minimum cross sectional area is about 4.0 x 10^-4 m^2. A compressional force in excess of 6.8 x 10^4 N will fracture this bone. A.) Find the maximum stress that this bone can withstand and B.) What is the strain that

25. Physics (Velocity in two dimensions)

Please explain, A clown in a circus is about to be shot out of a cannon with a muzzle velocity of 15.2 m/s, aimed at 52.7° above the horizontal. How far away should his fellow clowns position a net to ensure that he lands unscathed? The net is at the same

Suppose

27. chemistry

8.09% carbon, 0.34% hydrogen, 10.78% oxygen, and 80.78% bromine its similar to the last one i posted empirical formulas

28. Math Helpppp

The College Board, which are administered each year to many thousands of high school students, are scored so as to yield a mean of 550 and a standard deviation of 100. these scores are close to being normally distributed. what percentage of the scores can

29. chemistry

sometimes,instead of percentage composition, you will have the composition of a mass sample. using the actual mass of the sample, determine the empirical formula for compounds that have the following analyses. b. a 13.07g sample of an unknown substance is

30. Chemistry

calculate the pH and the propionate ion concentration [c3h502-] of a solution that is .06M in potassium propionate [kc3h502] and .085M in propionic acid [hc3h502]

31. Science

a sample of an unknown metal has a mass of 21.6g and a volume of 8.00cm^3 . calculate the density of the unknown metal

32. math

a car weighing 15000N rounds a curve of 60m. radius banked at angle of 30 degrees.find the frictional force acting on the tires when the car is travelling at 100kph.The coefficient of friction between the tires and the road is 0.90.

33. chm

Why are the atomic masses listed in the periodic table not whole numbers? Answer Scientists have yet to make the precise measurements. That would be too much of a coincidence. ??>>The atomic masses are average atomic masses. or >>Today's instruments are

34. physics homework

two tugboats pulled a disabled supertanker. each tug exerts a constant force of 1.80 x 10 degree N, one 14 degree west of north and the other 14 degree east of north, as they pull the tanker 0.75 km toward the north. what is the total work they do on the

35. statistics

Accuracy of price scanners at Wal-Mart. The National Institute for Standards and Technology (NIST) mandates that for every 100 items scanned through the electronic checkout scanner at a retail store, no more than 2 should have an inaccurate price. A recent

36. Elementary Analysis

A company wants to manufacture cylindrical aluminum cans with a value of 1000cm^3 (1 Liter) What radius and height of the can be to minimize the amount of aluminum used? Please help! This is very hard. Thanks.

37. american government

which of the following ideas was not promoted by the social contract theory

38. Calculus and Vectors

Show that proj(b⃗a⃗) =[(a⃗⋅b⃗)/(b⃗⋅b⃗)](b⃗)

39. Thermodynamics

A cylinder contains one liter of air at room temperature (300 K) and atmospheric pressure (10^5 N/m^2). At one end of the cylinder is a massless piston, whose surface area is 0.01 m^2. Suppose that you push the piston in very suddenly, exerting a force of

40. Chemistry

Ammonia is composed of hydrogen and nitrogen in a ratio of 9.33 g of nitrogen to 2.00 g of hydrogen. If 2.19 g of nitrogen combined completely with hydrogen to form ammonia, what mass (g) of ammonia would be formed?

41. Science

What did Oprah Winfrey do for 152 exceptional girls in South Africa? Select one: a. She gave each of them college scholarships. b. She helped them attend school in the United States. c. She invited them to attend her new school. d. She convinced them to

42. Math

The number of gallons of water remaining in a swimming pool t minutes after the drains are opened and the pool begins emptying is give given by the function f(x)=40t^2-3000t+40,000 gallons. Between 3 and 5 minutes after the drains were opened, the pool

43. Geometry

An isosceles trapezoid has bases of length 20 and 12 centimeters and legs of length 11 centimeters what is the area of the trapezoid to the nearest tenth

44. Physics

A lens with a focal length of 25 cm is placed 45 cm in front of a lens with a focal length of 5.0 cm. a) How far from the second lens is the final image of an object infinitely far from the first lens? b) Is the image in part a in front of or behind the

45. research methods

determining variables and identifying this type of quasi-exp design for this study is confusing: Study: lower socioeconomic status student benefit more over time from an academic tutoring program than higher socioeconomic students. Now: looks like this is

46. math

find the present value using the present value formula. Achieve \$ 225,500 at 8.65% compounded continusly for 8 years 155 days

47. AP Chem

Need help with this practice problem. I got the values for the gas to liquid and liquid to solid. Don't know how to do the rest? Heat of Vap and fusion too? No idea! What is the enthalpy change during the process in which 100.0 g of water at 50.0 C is

48. AP Chem

Need help with this practice problem. I got the values for the gas to liquid and liquid to solid. Don't know how to do the rest? Heat of Vap and fusion too? No idea! What is the enthalpy change during the process in which 100.0 g of water at 50.0 C is

49. biology

27. Pretend you are a carbon atom that was part of a molecule of CO2 dissolved in the water at the beginning of the experiment. Describe a path you could take through both organisms in this experiment, including the molecules you would be a part of and the

50. maths

ABCD is a parallelogram. AB=9cm,BC=5cm and DE is perpendicular to AB.If the area of parallelogram is 36sqcm,find AE?

51. Trig identities:(

Sin4A - cos4A = sin2A - cos2A Can i just square root the left side??:O

52. chm

How would you classify the following material?swimming pool water homogeneous mixture

53. physics

The resistances of a platinum resistance thermometer at the ice point, the steam point and the boiling point of sulphur are 2.50,3.50,and 6.50 respectively. find the boling point of sulphur on the platinum scale. the ice point and the steam point measure 0

54. Physics

3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0), point B at (d,0), point C at (d/2,d3√/2). Point P is inside the triangle such that AP=BP=CP. What is the electric field at P -

55. Math

Two paths diverge at a 48 degree angle. Two mountain bike riders take separate routes at 8km/hr and 12km/hr. How far apart are they after 2 hours? Include a diagram.

56. Chemistry

When 4.54 g of a nonelectrolyte solute is dissolved in 565 mL of water at 29 °C, the resulting solution exerts an osmotic pressure of 835 torr. What is the molar concentration of the solution? How many moles of solute are in the solution? What is the

A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. The length and radius of the collagen are 2.5 and 0.091 cm. Young's Modulus is 3.1 x 10^6 N/m^2. a.) If the stretching obeys Hooke's Law, what is

58. chem

how many moole of helium gas is needed to pressurize an evacuated 25.0L tank to a pressure of 120 atm at 25.0 C ?

59. Math

Two paths diverge at a 48 degree angle. Two mountain bike riders take separate routes at 8km/hr and 12km/hr. How far apart are they after 2 hours? Include a diagram.

60. chemistry

what pressure would have to be applied to a 27.2 ml sample of gas at 25 Celcius and 1.00atm to compress its volume to 1.ooml without a change in temperature

61. calculus

At noon, you and I start at the same place, and then you head east at a speed of 5 kilometers per hour, and I head north at a speed of 4 kilometers per hour. After two hours, how fast are we moving apart, in kilometers per hour?

62. Physics

3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0), point B at (d,0), point C at (d/2,d3√/2). Point P is inside the triangle such that AP=BP=CP. What is the electric field at P -

63. Precalc

Convert the complex number c=3cis 0.25 into rectangular form.

64. Chemistry

Na2CO3 + NiCl2 ¨ NiCO3 + 2NaCl Using the solubility rules determine the solubility of all reactants and products. Explain your answer. I answered Na2 as soluble, Co3 as soluble, NiCl2 as soluble ---->NiCO3 as insoluble, and 2NaCl as soluble. My

65. language arts

what similar character traits do the three samurai share? on the story the oxcart

66. Thermodynamics

The initial state consists of a closed system containing one mole of super-heated liquid water at 115°C and 1 atmosphere pressure. The immediate surroundings are also at 115°C and 1 atmosphere pressure. The change in state is described as this one mole

67. Physics

The antenna broadcasts radio signals at the resonant frequency of the tank circuit. Suppose that a certain tank circuit in a shortwave radio transmitter has a fixed capacitance of 1.8 x 10-11 F and a variable inductance. If the antenna is intended to

68. Physics

A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. The length and radius of the collagen are 2.5 and 0.091 cm. Young's Modulus is 3.1 x 10^6 N/m^2. a.) If the stretching obeys Hooke's Law, what is

69. science

what are three opposites or non-examples of fossil records?

70. algebra

FIND THE VALUE OF K, SO THAT THE EXPRESSION IS A PERFECT SQUARE TRINOMIAL. x^2+6x+k k=

asked by student needs immediate help
71. Chemistry

At the start of the reaction there are 0.714 mole of H2, 0.984 mole of I2, and 0.886 mole of HI in a 2.70 L reaction chamber. Calculate the concentrations of the gases at equilibrium.

72. science

The atmospheres of Mars and Venus are mostly carbon dioxide. Earth’s atmosphere contains only a fraction of a percent of carbon dioxide. Why is Earth’s atmosphere so different from those of Mars and Venus?

73. college algebra

now i understand both intersection and union but not with an infinity. how do i figure this out (-infinity,4)n(0,infinity)

74. Chemistry

Suppose u place a beaker containing a solution in a refrigerator , an hr later a white solid is found on thr bottom of thr beaker. What happened. Why? I think a precipitate formed, but can any1 explain briefly so i can understand better? Thanks

75. Finite Math

6. A computer company has two manufacturing plants, one in Rochester and one in Queens. Transporting a computer from Rochester to the retail outlet takes 15 hours and costs \$15, while transporting a computer from Queens to the retail outlet takes 20 hours

76. math

Assume the car can be purchased for 0% down for 60 months (in lieu of rebate). A car with a sticker price of \$42,500 with factory and dealer rebates of \$5,100 (a) Find the monthly payment if financed for 60 months at 0% APR. (Round your answer to the

77. Earth Science

Which organism evolved before the others in geologic time? mammals amphibians reptiles **fish Which type of organism evolved later than the others? **mammals amphibians reptiles fish

78. math

How much money would have to be deposited into a compound interest savings account earning 5% each year in order to accumulate \$10,000 in 18 years?

79. math

simplifying expressions

80. Math

In a computer lab there are two di erent printers. From 1pm-2pm Printer1 receives on average 12 print jobs and Printer2 receives on average 5 print jobs. Assume the number of print jobs requested on Printer1 and on Printer2 are independent of each other.

81. Math

The number of gallons of water remaining in a swimming pool t minutes after the drains are opened and the pool begins emptying is give given by the function f(x)=40t^2-3000t+40,000gallons. Exactly 2 minutes after the drains are opened, the pool was

82. ENGLISH

need help with nominative and objective CASE PRONOUNS. these are the ones confusing me... THE POSTAL WORKER DELIVERED A PACKAGE FOR HARRY AND SHE/HER. MY GRANDFATHER AND HER/SHE OPERATED A SMALL INN IN VERMONT. THE COACH PRAISED MANUEL AND HE/HIM. WE'VE

83. Math

A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles. What is the conditional probability that, without replacement, the second marble is purple given that the first marble was green?

84. Calculus

g(t) = 1/(t^5 + 1)^2 g'(t)

85. Geometry

An isosceles trapezoid has bases of length 20 and 12 centimeters and legs of length 11 centimeters what is the area of the trapezoid to the nearest tenth

86. Calculus

Find an equation of the tangent line to the curve at the given point y^2 = x^3 (2-x) (1,1)

87. Math

An electron accelerates from rest to the right, in a horizontally directed electric field. The electron then leaves the electric field at a speed of 4.0 × 106, entering a magnetic field of magnitude 0.20 T (Tesla) directed into the screen. Calculate the

88. College Algebra

Hello, I have been trying to do my math homework for a few hours now and can not figure out how to find the indicated intersection or union in interval notation. Example: (-1,5)n[0,8) Please help me!!

Determine which sampling method was used in each scenario. on a particular day 5 flights are selected at random and all of the passengers on these 5 flights are screened. Airport security uses a random number generator to determine the next passenger to

90. medical terminology

Using either or both chapters (6 and/or 7) create a SOAP note using five medical words discussed in this week’s reading.

91. Precalc

Write the complex number z = −6 in polar form

92. Math

CosA/1+sinA=1-sinA/cosA I have to prove the identity each side has to b the same how would i do that? I have a unit test on monday so im doing practice questions

93. United States Constition

Details: Part I: Principles of the Constitution Create a chart or a matrix outlining the following primary principles of the Constitution: 1. Self-Government 2. Separation of Powers 3. Checks and Balances Write an analysis of 250-500 words on the

94. maths

find the radius of the circle if length of arc is 4p cm and angle made by the arc at the centre is 40 deg.find the area made by the arc.

Determine which sampling method was used in each scenario. on a particular day 5 flights are selected at random and all of the passengers on these 5 flights are screened. Airport security uses a random number generator to determine the next passenger to

96. maths-urgently needed

A person buys a refrigerator for rupees 12000. He pays rupees 6000 in cash and agrees to pay the balance in 12 annual instalments of rupees 500 each. If the rate of interest is 12% and he pays it with instalments on the unpaid amount, how much did the

97. Engineering Econonmy

You decide to open an IRS-approved retirement account at your local brokerage firm. Your best estimate is that it will earn 9 percent. At the end of each year for the next 25 years, you will deposit \$4000 per year into the account (25 total deposits). 3

98. Math

Solve the equation by first factoring the quadratic expression. 1. x2+4.5x=0 2. x2-9x=0 3. -x2+10x=0

99. Math

Solve the equation by first factoring the quadratic expression. 1. x2+4.5x=0 2. x2-9x=0 3. -x2+10x=0

100. geometry

ABCD is a square of side length 1. E , F , G and H are the midpoints of AB , BC , CD and DA , respectively. The lines FA , AG , GB , BH , HC , CE , ED and DF determine a convex 8-gon. By symmetry, this octagon has equal sides. If s is the side length of

101. Physics

A battery has an internal resistance of 0.017 Ù and an emf of 9.00 V. What is the maximum current that can be drawn from the battery without the terminal voltage dropping below 8.75 V?

102. science

name three examples of a fossil record

Determine two angles between 0°and 360°that have a secant of -4. Round your answers to the nearest degree. There are tw answer 104°( I got this one but there is also 256° I don't have anyidea for this one please explain to me I appreciate your time

104. Science

What units of measurement do you use to measure the earth to... 1. Moon 2. Galaxy 3. Sun 4. Communication satellite 5. Pluto 6. Proxima Centauri

105. Math

abcd is a parallelogram with sides ab=12 cm,bc=10 cm and diagonal ac=16 cm .find the area of the parallelogram also find the distance between its shortest sides

106. chemistry

One reaction that produces hydrogen gas can be represented by the unbalanced chemical equation Mg(s) + HCl(aq) −! MgCl2(aq) + H2(g) . What mass of HCl is consumed by the reac- tion of 2.96 mol of magnesium? Answer in units of g

107. us history

plz someone give me the answer ive read m book over and over i cant find the answer to why is new orleans important

108. Math

the pet shop owner told jean to fill her new tank 3/4 full with water. Jean filled it 9/12 full. what fraction of the tank does Jean still need to fill?

109. Chemistry

A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. What mass of precipitate forms in this reaction?

110. chem

Mg(s) + 2HCl(aq) −> MgCl2(aq) + H2(g) What mass of MgCl2 is produced? Answer in units of g second part What mass of H2 is produced? Answer in units of g

111. MATH

If the sales tax on an item is 7%, the sales tax on an item costing d dollars can be found by the expression .07d. Determine the sales tax on a compact disk that cost \$15.99.

112. Maths

L=2x-1 W=x+3 Area =294cm find length and with of rectangle

113. Calculus

F(x) = 2√(1 + tanx) f'(x) 2√ = x^(1/2)

114. Science

Would the function of the lung be affected if the alveoli were surround by walls made of several layers of cells rather than a single layer of cells? How?

115. World History

Consider the meaning of bloodletting and human sacrifice to the Mesoamericans How do these practices make sense in the context of their belief systems?

116. biology

Can a snail survive in an aquarium with no living plants in it? What do fish owners do to compensate if their aquarium has no plants?

117. statistics

approximately 300 millions golf balls were lost in the united states in 2009 assume the number of gold balls lost in an 18 hole is distributed as a poisson random variable with a mean of 5 balls

118. Chemistry

At the start of the reaction there are 0.714 mole of H2, 0.984 mole of I2, and 0.886 mole of HI in a 2.70 L reaction chamber. Calculate the concentrations of the gases at equilibrium. The equilibrium constant is 54.3.

119. econ

Consider the market for trucks. Assume that the demand for trucks is given by 60 2 5 D Q P Y where P is price per truck and Y is the income of the buyers. The supply of trucks is given by 30 5 3 S Q P W where W is the price of all the materials needed to

120. pre-calculus

theta=sin^-1 (5/13) ; (x,y)=(-3,1) how do u find the coordinates of x' and y'??

121. science

Using either or both chapters (6 and/or 7) create a SOAP note using five medical words discussed in this week’s reading. urinary and male reproductive system

122. Chemistry

1. A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. Which reactant is the limiting reactant? 2. A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. How many moles of precipitate form in

123. Chemistry

pH Strip b = 10. Strip D = 3 what would happen if you mixed togather equal amounts of the solutions that produced the results of strip b and strip d?

124. Plz urgent

The video discusses the logistics involved some of fedex service offering. Fedex ship FOB destination because the seller pays the freight. If there is damage to a domestic freight shipment, fedex will provide up to \$50 per pound insurance on new items or

126. math

Solve each system of equations by graphing. Check each solution. The perimeter of a rectangle is 24 ft. Its length is five times its width. Let x be the length and y be the width. What is the area of the rectangle?

127. Math

Write the following complex number in polar form: z = 4 − 4i

128. Chemistry.

pH C ( dark green) pH : 8 d ( purple) pH : 3 Suppose u mix togather equal amounts of the solutions that produced the results of strip C and strip D , then test the pH of this new solution. What colo will the indicator paper be ? Explain.

129. Chem

Hey in class we learned that pi molecular orbitals come from overlapping p atomic orbitals...this occurs in a conjugated system or aromatic rings ( contains sp2 carbons with one remaining p orbital which can can overlap to form double bonds)...my question

130. physics

A 50kg rocket is fired vertically upwards and experiences a 300N air friction force.What upthrust must the rocke motor produce in order to accelerate the rocket upwards at 6m per second

131. Microeconomics

If fixed cost is \$8,000, variable cost is \$5,000 at an output of 2 and \$9,000 at an output of 3, how much is marginal cost at an output of 3? Can someone show me how to do the formula step by step?

132. College Algebra

need help finding the distance using the distance formula please!!! (0,0) (x,y)

133. Chemisry

What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. The density of the solution is 0.995 g/mL. Please show work, thank you!

134. Math

Find the equation of the secant line to the graph of y= 2x^3-3x^2+4x-1 from x=1 to x=3. Give your answer in slope-intercept form.

135. chemistry

convert 725mm Hg into equivalent kPa

136. chemistry

Calculate the wavelength of a proton with energy 2.45eV. in meter plz

137. chemistry

what mass of Fe3O4 would conatin 1.85*10^21 atoms of Fe?

138. resume

I am not a english speaker!!!!!!!! i am writing a resume is this statement correct: I am introducing my work: Student focus teaching professional with instructional experience and multicultural knowledge. Currently one of three teachers at Grovetown High

139. chem!!!!!!

empirical formulas" p 889(153e)

140. pre calc

theta=sin^-1 (5/13) ; (x,y)=(-3,1) how do u find the coordinates of x' and y'??

141. World History

Why did the Persians who seemed more powerful lose to Alexander?

142. World History

What were Alexander's lasting contributions to society?

143. Chemistry

A compound which can donate 2 protons is termed dibasic acid. What is the name given to a compound which can accept 2 protons?

144. algebra

electricity costs 7.57 a month plus 8.77 per kilo watt hour for the first 400 kWhr and 6.574 per kWhr for all useage over 400 in a month. what is the cost for 300 kWhr? 2638 What is the cost of 700? 7.57+8.77 times 400 and 6.574 times 300? 5487.77 I think.

145. Math

Imagine a country has a population of 210 million. Within the country there are 95 million people who are employed workers, 50 million people incapable of working, and 60 million people capable of working, but not actively looking. Based on this

146. social studies

Which of the following related subjects is listed as a broader term?

147. Spanish

ombina las palabras lógicamente. 1. la langosta 2. la salchicha 3. el ají 4. el caldo 5. el sacacorchos 6. hornear 7. los ingredientes 8. la sal 9. el durazno 10. el aderezo a. el vino b. la toronja c. la sopa d. la receta e. la pimienta f. la ensalada

148. calculus

F(x)= log_3 (1-5x) F'(x)=

149. math

Given two numbers whose sum is 56. Six times the larger is 72 more than 5 times the smaller. Find the numbers. Please help me solve this problem in a simple explanation so I can understand it.

150. science

How does the temperature change in the sun's atmosphere differ from the temperature change in the sun's interior?

151. English

If the sentence was: Ramai was so nervous that she had already dropped and ____ two dishes. What way would I write BREAK to make it fit into this sentence?

152. math 83

3(2/3+3/4)+5(3/4+2/5

153. edu

Ms Sanchez is selecting a picture book to share with her two year olds. She will try to select a book with: a.few pictures so the story is lessened d. detail messages c.simple drawings d.fantasy type illustrations I think d not sure

155. calculus

Find dy/dx by implicit differentiation. x^4 + x^3y + 4y^2 = 7 x cos y + y cos x = 1

156. calculus 2

integrate e^(2x) / (e^(4x) + 9) am I allowed to simplify the e^(2x) with the e^(4x)? Thank you

157. math

kylie answered my question but did not go into detail how to solve the problem. Here's the problem I need help with. Given two numbers whose sum is 56. Six times the larger is 72 more than 5 times the smaller. Find the numbers. I need to know step by step

158. physics

How fast is a city on the earth's equator (such as Singapore) moving due to our planet's daily spin on its axis?

159. Calculus

F(x) = (x^3 - x + 1)^4 f'(x)=

160. I need help

1. What is the organization in the first paragraph of "The Next Big Thing"? (1 point) chronological order compare and contrast problem and solution order of importance 2. Which of the following could not be considered the theme of "Big Yellow Taxi"? (1

161. Geography

Hydrosphere basic facts and what makes up the hydrosphere?

162. College Math

Could someone please explain the union to me. I don't understand. I get the intersection ones but not union. HElp me? Ecample: (-1,1)U[0,6]

163. science

Create a SOAP note using five medical words from the urinary or male reproductive system

164. chemistry

(b) Calculate the amount of zirconium produced (in kg) if a reactor were charged with 310.0 kg and 29.0 kg Na.

165. Finance

You plan to open a retirement account. Your employer will match 50 percent of your deposits up to a limit on the match of \$2500 per year. You believe the fund will earn 12 percent per year over the next 30 years, and you will make 30 deposits of \$5000,

166. Science

in what ways do you think earth's moon may be similar to mercury

167. Precalc

Write the complex number z = 2 + 5i in polar form, rounding to the nearest hundredth if needed.

168. Precalc

The vectors, (2, -1) and (4, 8), are 1)parallel 2)perpendicular 3)neither parallel or perpendicular

169. pysics

a force of 4N at 30 degree from another force 5Nwk is pointing east. find the resistance of the two forces using parallelogram