# Questions Asked onOctober 2, 2011

1. ## physics

You are trying to ﬁnd out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You discover that the balloon bursts when you have pitched it to a height of 14 m. With what velocity did the balloon hit the ground?

2. ## chemistry

Mg3N2 +6H2O- 3Mg(OH)2 + 2NH3-- How many grams of H2O are needed to produce 150g of Mg(OH)2? I thought I had this but.....the correct answer should be 93 grams Where did I go wrong?? 1) Change 150 g Mg(OH)2 into moles by dividing by molar mass from periodic

3. ## math word problems

Sally and marta had the same number of postcards. After sally sold 18 of her postcards, marta had 4 times as many postcards as sally. How many postcards did each girl have to begin with?

4. ## Physics

On a hot summer day in the state of Washington while kayaking, I saw several swimmers jump from a railroad bridge into the Snohomish River below. The swimmers stepped off the bridge, and I estimated that they hit the water 1.5s later. a) How high was the

5. ## physics

As you hurry to catch your flight at the airport, you encounter a moving walkway that is 85m long and has a speed of 2.2 m/s relative to the ground. If it takes you 68s to cover 85m when walking on the ground, how long will it take you to cover the same

6. ## Physics

The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.15. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?

7. ## math

the height in feet of a flare t seconds after it is shot is modeled by h(t)= -16t2+92t+3.5 find its average speed from 1 to 3 seconds

8. ## math

a) What is the area of the tri-angle determined by the lines y= − 1/ 2x + 5,y =6x and they-axis? (b) If b > 0 and m < 0, then the line y = mx +b cuts off a triangle from the first quadrant. Express the area of that tri-angle in terms ofm andb. (c) The

9. ## Pre-Calculus

A rectangle is bounded by the x-axis and the semicircle y = √36 – x2, as shown in the figure below. Write the area A of the rectangle as a function of x, and determine the domain of the area function. A = all real numbers except x = 36 all real numbers

10. ## Physics

A 800 N crate is being pulled across a level floor by a force F of 320 N at an angle of 29° above the horizontal. The coefficient of kinetic friction between the crate and the floor is 0.25. Find the magnitude of the acceleration of the crate.

11. ## Chemistry

What shell contains a total of 16 orbitals? A. n = 1 B. n = 2 C. n = 3 D. n = 4 E. n = 5

12. ## statistics

samples of size n=900 are randomly selected from the population of numbers (0 through 9) produced by a random-number generator, and the proportion of numbers greater than 5 is found for each sample. what is the shape distribution of the sample proportions

13. ## chemistry

what mass of water can be obtained from 4.0g of H2 and 16g of O2?

14. ## CHEM - ASAPPP

write the equation for the reaction of fecl2 with k3[fe(cn)6]???

15. ## physics

Two stones are thrown vertically up at the same time. The first stone is thrown with an initial velocity of 12.5 m/s from a 12th-floor balcony of a building and hits the ground after 4.6 s. With what initial velocity should the second stone be thrown from

16. ## Chemistry

A balanced equation for copper oxide + ethanoic acid.

17. ## physics

Judy, by chance, spots a potted plant falling outside the window at 2.04 m/s . Further down the same building, Judy’s boyfriend clocks the pot at 56 m/s . How far apart are the friends? The acceleration of gravity is 9.8 m/s 2 .

18. ## physics 180A

A large spring is placed at the bottom of an elevator shaft to minimize the impact in case the elevator cable breaks. A loaded car has mass 480kg, and its maximum height above the spring is 11.8m. In order to minimize the shock, the maximum acceleration of

19. ## Chemistry

A mixture contains only CuCl2 and FeCl3. A 0.7391 g sample of the mixture is completely dissolved in water and treated with silver nitrate. if 86.91 mL of 0.1463 M silver nitrate soultion is needed to precipitate all the chloride as silver chloride, what

20. ## PHYSICS

Given: The initial position of the block is the origin; i.e., x = 0 at t = 0 . Consider down the track to be the positive x-direction. A block with an initial velocity v0 slides up and back down a frictionless incline. Which graph best represents a

21. ## physics

There are two blocks connected by a string and tied to a wall on an incline. The mass of the lower block is 1.0kg; the mass of the upper block is 2.0kg. Given that the angle of the incline is 31*, find the tension in (a) the string connecting the two

22. ## Chemistry

What must be the molarity of an aqueous solution of trimethylamine, (CH3)3 N, if it has a PH=11.20?

23. ## physics

a trench mortar fires a shell at an angle of 30 degrees with the horizontal and with a speed of 500 m/s. find its range and the maximum height it attains?

24. ## physics

a jet airliner moving initially at 3..00X10^2 mi/h due east enters a region where the wind is blowing 1.0 x 10^2 mi/h in a direction 30 degrees north of east. A) find the components of the velocity of the jet airliner relative to the air. b) find the

25. ## science

Steel expands 1 part in 100 000 for each 1°C increase in temperature. If the 1.5km main span of steel suspension bridge had no expansion joints, how much longer would it be for a temperature increase of 20°C?

26. ## calculus

given the circle having the equation x^2+y^2=9, find the shortest distance from the point (4,5). find the longest distance from the point (4,5).

27. ## chemistry

How much heat is emitted when 4.55 of water condenses at 25 ? The heat of vaporization of water at 25 is 44.0

28. ## Physcial Science

Alpha particle tracks through gases and thin metal foils show few deflections. What does this tell us about the atom?

75. ## Physics

For anti-ballistic missile system, the time of flight tf is determined by the initial speed v0 of the missile and the range R. What is the time (in minute) of the flight tf available to kill an incoming intercontinental ballistic missile launched from

76. ## Physics

A ball rolls off a table moving 3.6m/s in the horizontal direction. The table is 1.2 meters high. Find the amount of time needed for the ball to hit the ground.

77. ## A.P. Chemistry

Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X 64.8% ? Y 73.0% 104. Z

Which of the following would be classified as an informative or positive message? a) A request for information b) An announcement of a policy that reduces benefits c) A memo for the file recording actions and rationales d) A letter to an employer

79. ## Physics

how can the equilibrant of two or more concurrent forces be found

80. ## CHEM 102 (University Chemistry)

What must be the molarity of an aqueous solution of trimethylamine, (CH3)3N, if it has a pH = 11.20? (CH3)3N(aq)+H2O(l) double arrow (CH3)3NH+(aq)+OH-(aq) Kb value = 6.3x10^-5 mol/L

81. ## chemistry

34.42mL of 0.1013 M NaOH is used to titrate a 25.00 mL sample of H2SO

82. ## Astronomy

Show that Kepler's third law is consistent (approximately) for the orbits of the Mars and Saturn. Show all your calculations and appropriate units. P Mars = 690 days; a Mars = 2.3 x 108 km P Saturn = 10,700 days; a Saturn = 1.4 x 109 km

83. ## health

Write a 350- to 700-word paper in which you discuss corrections accreditation and privatization. Address the following questions: • What is corrections accreditation? How does corrections accreditation affect the professional development of corrections

84. ## Chemistry

If the standard state of sufur is S8 (s), which of the following equations represents the standard enthalpy of formation of H2SO4 (ℓ) ? A. 2H (g) + S (g) + 4 O (g)  H2SO4 (ℓ) B. H2 (g) + S8 (g) + 2 O2 (g)  H2SO4(ℓ) C. H2SO4 (ℓ)  H2 (g) +

85. ## Chemistry

Nitrogen effused through a pinhole 1.7times as fast as another gaseous element at the same conditions.Estimate the other element's molar mass. Answer in units of g/mol

86. ## physics

why is it wrong to think of a scientific law as a universal statement of truth?

87. ## chemistry

A solution of 114 mL of 0.190 molecules KOH is mixed with a solution of 200 mL of 0.220 molecules NiSO4. a. write a balanced equation for the reaction that occurs. identify all phases in answer

88. ## English

I really need you to check these sentences I wrote on the drama. Please help me! 1) The tragedy is the oldest and once most popular form of drama. It consists of a dramatic work in which events move to a tragic conclusion. 2) Tragedies are generally

89. ## physics

Two stones are thrown vertically up at the same time. The first stone is thrown with an initial velocity of 11.5 m/s from a 12th-floor balcony of a building and hits the ground after 4.0 s. With what initial velocity should the second stone be thrown from

90. ## science

A certain infant analgesic medicine has a single dose of 36.0 mg/kg of body weight. How much analgesic will be administered in a single dose for an 18.4 pound toddler

91. ## science

Why can neutrinos travel immense distances through matter whereas other elementary particles cannot?

92. ## Socials

Describe the situation of women in Canada, in the years before world war I. They had very few rights. Their husbands controlled their property, and they were mainly employed as servants and factory workers. They didn't have the right to vote, and were

93. ## Chemistry

Calculate the enthalpy change, ΔrH, for the following reaction, 4 NH3 (g) + 5 O2(g) → 4 NO (g) + 6 H2O (g) given the thermochemical equations below. N2 (g) + O2 (g) → 2 NO (g) ΔrH° = +181 kJ N2 (g) + 3 H2 (g) → 2 NH3 (g) ΔrH° = 91.8 kJ 2 H2

94. ## physics

A motorcycle is traveling up one side of a hill and down the other side. The crest of the hill is a circular arc with a radius of 35.5 m. Determine the maximum speed that the cycle can have while moving over the crest without losing contact with the road.

95. ## trigonometry

the height of a triangle is 10m longer than twice its base. its area is 176m^2. Find the lengths of its height and base.

96. ## Math

Expand [1+x^2(1+x)]^7 in ascending powers of x as the term in x^8.

97. ## Physics

A box of books weighing 290 N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 35.0° below the horizontal. If the coefficient of kinetic friction between box and floor is 0.57, how long does it take to move

98. ## College Chemistry

Zinc, copper, lead, and mercury ions are toxic to Atlantic salmon at concentrations of 6.42 times 10 to the -2 mM, 7.16 times 10 to the -3 mM, 0.965 mM, and 5.00 times 10 to the -2 mM, respectively. What are the corresponding concentration is milligrams

99. ## Chemistry

If DeltaH for the reaction I2 (s) Delta 2I (g) is 153 kJ/mol. What is the longest wavelength of light that can break an I – I bond? In other words, what is the minimum energy, expressed in terms of wavelength, required to break one I – I bond?

100. ## physics

A model rocket is launched straight upward with an initial speed of 45.4 m/s. It accelerates with a constant upward acceleration of 2.98 m/s 2 until its engines stop at an altitude of 150 m. What is the maximum height reached by the rocket? The

101. ## physics

A man cycles to his destination with the wind at 8m/s and returns home against the wind at 4m/s what is his average speed

102. ## physics

A 19.2-kg box rests on a frictionless ramp with a 16.1° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 43.6° with the horizontal, what is the smallest force F the mover will have to exert to

103. ## geometry

Point B is midpoint of Lince AC. Given: AB=2x-1 BC=4x+2 AC=25 Find: AB and BC

104. ## Social Media

Over the last century, has music changed from being about artistic expression to being more about money and business? Is it even possible for a band or artist to make topical or political commentary in a song today while focusing on turning a profit?

105. ## math

Find the value of the angle data in degrees rounded to the nearest tenth of a degree.

106. ## chemistry

A total of 2.00 \rm mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 115 g of solution. The reaction caused the temperature of the solution to rise from 21.0 to 24.7 ^\circ \rm C. What is the enthalpy of this

107. ## Science NEED HELP NOW

Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometers away. It takes Amy 40 minutes to arrive at school. Bill arrives 20 minutes after Amy. How much faster (in meters/second) is Amy’s average speed for the

108. ## Chemistry

If H for the reaction I2 (s)  2I (g) is 153 kJ/mol. What is the longest wavelength of light that can break an I – I bond? In other words, what is the minimum energy, expressed in terms of wavelength, required to break one I – I bond? A. 246 nm B.

109. ## physics

A fireman d = 39.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of èi = 25.0° above the horizontal as shown in the figure. If the speed of the stream as it leaves the hose is vi = 40.0 m/s, at what

110. ## functions grd 12

what are the number of turning points for this equation? y=4x^2 and can you plz explain how u find them thanks :)

111. ## Math

Factor 1. 8a^2-2ab-21b^2 2. 6m^2-90m+324 3.5x(2-x)+4x(2x-5)-(3x-4) 4. 9(y-1)^2-25 5. 3x^2-27(2-x)^2

112. ## English

I'm writing an essay involving analysis of a short story. I need to put in-text citations after quotes, etc. The short story was read online so there is no page number, etc. How do I cite this-I'm really confused. I looked in Purdue Online Writing Lab but

113. ## Physics

Two objects attract each other gravitationally with a force of 2.9 10-10 N when they are 0.29 m apart. Their total mass is 4.0 kg. Find their individual masses.

114. ## US History

How did the British mercantlism prevent the economic development of the colonies? A.) The colonies were process to export their products to Great Britain only, thus limiting development. B.) British laws discouraged the growth of manifacture and forced

115. ## government

Society operates more efficiently if government power is centralized. What reasons exist for continuing federalism in its current form? In other words defend a federal system of government? (Give 4 arguments).

116. ## Comp 156

How does a persuasive essay differ from a biased essay?

117. ## Letter to Teacher

Dear Mrs. Gebbia, Hi! You may not know me but my name is Laruen Jean-Baptiste. I’m currently in the 7th grade & it will be an honor for me to join the school’s newspaper this year. I love writing a lot, it’s part of my life. When I join the

118. ## Math

Susan has some $2-coins and$5-coins. If there are 18 coins and the total amount of these coins is not less than $75, find the minimum number of$5-coins.

330. ## Geology

When a hurricane approches a costal area the damage from the storm surge is greater if it occurs: low tide, high tide, tide makes no difference? The dew point of a prcel of air refers to: its elevation above the surface, the temp. at which condesation will

331. ## Statistics

Please help me. I am working a paper that needs a verbal statment and a numerical statement. My hypthoesis is The use of social media Facebook is associated with an increase among couples.. if anyone can help that would be great. Thanks so much.

332. ## algebra

how to solve equations like SQRT(x-6)/SQRT(4-x) for their domain

333. ## math

3/4-1/3z=1/4 5/6c-2/3c=1/3 please show step by step Thanks! I now the ans for the first one is 3/2 but how did you work it out?

334. ## maths

solve x2-(5-i)x+(18+i)

335. ## Geology

A thunderstorm tends to be more severe and have a longer duration if the axis of the storm is: tilted, perpendicular to the ground, or it makes no difference. (Straight forward answers, if possible use the answer choices provided please & thank you)

336. ## Calculus

Take the derivative of f(x) = 4x^3+(7/x^2).

337. ## physical geology

Select a city or region that is faced with one of the following issues: o Saltwater invasion in coastal wells o Depletion of an aquifer for drinking or agricultural water o Subsidence associated with water pumping o Depletion or pollution of surface water

338. ## Socials - - Canada

Identify four cultural/racial groups who were not popular choices for coming to Canada. With each group identify four ways in which the federal Gov't systematically made it tougher for these people to immigrate to and to move around in the country. Provide

339. ## English

These sentences refer to the definition of tragedies. Can you please check the grammar? Thank you very much in advance. 1) Classical tragedies were usually introduced by a prologue from a chorus, who commented on the main action or advised the main

340. ## Math

simplify 1. (2x^4-3x^2-6)+(6x^4-x^3+4x^2+5) 2. -7x(x^2+x-1)-3x(2x^2-5x+6) 3. -2x[ 5x-(2x-7)]+6x[3x-(1+2x)]

341. ## Geology

Winds blow whenever there are: cold temperatures, pressure inequalities in the atmosphere, or the earth rotates on its axis

342. ## physics

A bullet is fired with a speed of 450 m/s through a board 20cm thick. If the bullet is subject to a large deceleration of magnitude 10^6m/s^2, will the bullet be able to emerge from the other side of the board.?

343. ## Biology

explain the progression of the atmosphere from prebiotic to its current makeup

344. ## calculus

john h!@#\$%^&1.70 . he has 3 more dimes than quarter.

346. ## Science

what standards are used to measure temperature? WHAT DOES THIS QUESTION MEAN? and i would like an answer too

347. ## math

how do i write the slope-intercept form of the equation of the line through the given points??? through (0,-1) and (-5,-3)??

348. ## science

Tight junctions prevent the movement of the extracellular matrix between cells. A) True B) False Which one is it please :)

349. ## Maths

Sacks are filled with 100 kg of sand corect to the nearest 10 kg. what is the least possible amout of sand and the greatest possible amound of sand in a sack?

350. ## Math

what would be a set of 12 numbers that have the landmarks: maximum 8 range 6 mode 6 median 5

351. ## uco

how to solve 3x^2+4x-2=0 (mod 5)

i tried these quesions so manytimes , but i just cant get he rigt answer ! 1.) 4(2-a)^2-81 2.) -(x-y)^3 3.)3x^2-27(2-x)^2 4.) 9(y-1)^2-25