# Questions Asked onSeptember 27, 2014

1. ## chemistry

Calculate the empirical formula for compound ethyl butyrate (pineapple oil): C, 62.04%; H, 10.41%; O, 27.55% Can someone show me the steps?

2. ## Health Help?

1. A percentile rank represents the percentage of people who scored at or below the test score. True False 2. People who have high resting heart rates usually have high levels of cardiovascular fitness. True False 3. Resting heart rate is usually measured

3. ## Trig

A railroad tunnel is shaped like a semiellipse as shown below. A semiellipse is shown on the coordinate plane with vertices on the x axis and one point of intersection with the positive y axis. The height of the tunnel at the center is 27 ft and the

4. ## chemistry

Determine the number of moles of H in 4.70mol H2O. Please help I tried different ways to do it and I got them all wrong.

5. ## Algebra

A building is 2ft from a 9ft fence that surrounds the property. A worker wants to wash a window in the building 13ft from the ground. he plans to place a ladder over the fence so it rests against the building. he decides he should place the ladder 8ft from

6. ## chemistry

30 ml of sample of unknown strong base is neutralized after the addition of 12 ml of a 0.150 M HNO3 solution if the unknown base concentration 0.0300 M give the possible identities for the unknown base

7. ## chemistry

Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes saturated with water vapor. If 238.4 mL of gas with a total pressure 1.27 atm was collected via water displacement at 29.4 °C,

8. ## chemistry

How do you calculate the mass percent composition of nitrogen in NO2?

9. ## math

between which two square roots of integers can you find pi?

10. ## History

Why did the Hittites and others migrate from Central Asia to Mesopotamia? A- They needed more land for growing populations B- They were enlarging their empires C- The Persian army drove them out D- Climate change brought a mini ice age to Asia I think A.

11. ## Chemistry

If you dilute 14.0mL of the stock solution to a final volume of 0.350L , what will be the concentration of the diluted solution? Before it, there was a question: How many milliliters of a stock solution of 5.60 M HNO3 would you have to use to prepare

12. ## Chemistry

Please help! Calculate the standard change in enthalpy, ΔH°rxn, for the decomposition of calcium carbonate to calcium oxide CaCO3 (s) → CaO (s) + CO2 (g) Given that: ΔH°f CaCO3 (s) = -1206.9 kJ/mol ΔH°f CaO (s) = -635.1 kJ/mol ΔH°f CO2 (g) =

13. ## math

arnold has 24m of fencing to surround a garden, bounded on one side by the wall of his house. what are the dimensions of the largest rectangular garden that he can enclose? how do i solve this question please help step by step solutions please

14. ## chemistry

Imagine there is a tank of unknown gas that contains 53.31% carbon, 35.51% oxygen, and 11.18% hydrogen by mass. At 35.0 °C and 0.470 bar, 2.0 L of the gas has a mass of 3.3 g. Using this information, answer the following questions. a.) What is the

15. ## chemistry

Suppose 1.2x10^3 kg of C is mixed with 2.4x10^5g oxygen gas and carbon dioxide forms. 1. write the reaction and balance 2.which reactant is the limiting reagent and which reactant is in excess 3. How many grams of carbon dioxide will be formed.

16. ## chem

What is the correct name of the compound that is incorrectly named 1-chloro-3-pentyne?

23. ## chemistry

A 8.50-g sample of solid AlCl3·6H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?

24. ## physics

A small toy airplane is flying in the xy-plane parallel to the ground. In the time interval t=0 to t=10.0 s, its velocity as a function of time is given by

25. ## CHEM

What is the IUPAC name for the molecule shown here? H I \ / C=C / \ I H

26. ## Math

A bag contains three black balls, four white balls and five red balls. Three balls are removed without replacement. What is the probability of obtaining a one of each colour b at least two red balls ?

27. ## physics

A small toy airplane is flying in the xy-plane parallel to the ground. In the time interval t=0 to t=10.0 s, its velocity as a function of time is given by υ⃗ =(1.50m/s2)ti^+[13.0m/s−(2.00m/s2)t]j^.

28. ## physics

The barrel of a rifle has a length of 0.97m. A bullet leaves the muzzle of a rifle with a speed of 601m/s. What is the acceleration of the bullet while in the barrel?

29. ## physics

A basketball player throws the ball at a 53degree angle above the horizontal to a hoop which is located a horizontal distance L = 2.4 m from the point of release and at a height h = 0.9 m above it.What is the required speed if the basketball is to reach

30. ## chem

The electron in a ground state H atom absorbs a photon of wavelength 121.57nm, to what energy level does the electron move?

31. ## chemistry

A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide Use this data to calculate the mass percent composition of aluminum in aluminum oxide. (Sorry need help with this!)

32. ## Algebra 1

Adding and subtracting polynomials. (6-t-t^4) + (9t+t^4) How do you solve this problem?

33. ## chemistry

in HNO3 titration, you add few drops of phenolphthalein indicator to 50.0 mL of acid in a flask. you quickly add 20.00 mL of 0.0547 M NaOH but overshoot the end point, and the solutions turn deep pink. instead of starting over, you add 30.00 mL of acid,

34. ## Math

3x9=9x=( )= ( )

35. ## Physics

Consider two toy cars. Car A starts from rest and speeds up with constant acceleration for a time delta t until it reached a speed of v and then continues to travel at this speed. At the moment car A reaches its maximum speed, car B, starting at rest from

36. ## Material Sciences

Given an aluminum shell perfectly bonded to a steel core, what is the thermal stress in the aluminum shell when the system is heated from the unstressed state (20∘C) to 180∘C? Consider only deformations in the axial directions. Give your answer in MPa

37. ## physics

If the acceleration due to gravity on the Moon is 1/6 that what is on the Earth, what would a 100 kg man weight on the Moon? If a person tried to simulate this gravity in an elevator, how fast would it have to accelerate and in which direction?

38. ## Statistics

X is a normally distributed random variable X with mean 15 and standard deviation 0.25. Find the values xL and xR of X that are symmetrically located with respect to the mean of X and satisfy P(xL < X < xR) = 0.80. (Hint. First solve the corresponding

39. ## social statistics

a smoking researcher is interested in estimating the average age when cigarette smokers first began to smoke. Taking a random sample of 25, she determines a sample mean of 16.8 years and a sample deviation of 1.5 years. Construct a 95% confidence interval

40. ## physcis

A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 0.926 m (3.04 ft) by the time it reaches home plate 18.3 m (60 ft) away. How fast was the pitcher's pitch?

41. ## physics

A geosynchronous satellite is one that appears to be fixed in the sky, a condition useful for telecommunications. If such a satellite orbits the earth at an altitude of 33000 km above the earth's surface, what is its centripetal acceleration? The radius of

42. ## chemistry

A 8.80-g sample of solid SnCl2·2H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?

76. ## physics

The roadway bridge over a canal is in the form of an arc of circle of radius what is the maximum car can cross the bridge with the ground at the highest point

77. ## statistics

According to U.S. News & World Report data, in 1995 tuition costs at Indiana University, a public university, were $2,984 per year, while the tuition costs at the University of Evansville, a private university in Indiana, were$11,800 per year. In that

78. ## geometric sequence

The sum of the 2nd and 5th terms of a geometric sequence is 3.5. The sum of the 3rd and 6th is -7. Determine the ratio r of the sequence and the first term a.

79. ## physics

A spacecraft is in orbit close to the moon's surface. The centripetal acceleration is 1.6 m/s^2. If the radius of the moon is about 1.7 x 10^6 m, determine: a)the orbital speed b)the period of the orbit

80. ## physics

A state trooper chases a speeder along a straight road; both vehicles move at 160 km/h. The siren on the trooper's vehicle produces sound at frequency of 500 Hz. What is the Doppler shift in the frequency heard by the speeder?

81. ## algebra

on an expressway, the recommended safe distance between cars in feet is given by 0.019v^2+v+14, where v is the speed of the car in miles per hour. Find the safe distance when the following takes place( round answer to three decimal places). v=35 mph

82. ## CHEM

H2C=C-C-C-CH3 THERE IS AN H ATTACHED TO THE CARBON AFTER THE FIRST BONG THEN A H2 ON THE 2ND AND 3RD CARBON

83. ## Physics

A car travels 120 meters in one direction in 20 seconds. Then the car returns ¾ of the way back in 10 seconds. a) Calculate the average speed of the car for the first part of the trip. b) Find the average velocity of the car.

84. ## math

Find the sum of the first 60 terms of the arithmetic sequence whose first term is −15 and whose common difference is 7.

85. ## science

an empty truck with a mass of 3000 kg has a maximum acceleration of 1m/s2 .what will its acceleration be when it carries a load of 1000 kg?

86. ## Math plz help.

Write the letter of the property shown in each example. a. Commutative Property of Multiplication b. Identity Property of Multiplication c. Associative Property of Addition d. Identity Property of Addition e. Associative Property of Multiplication f.

87. ## physics

A ball falls 5.00 m to the ground. It remains in contact with the ground for 0.027 s and then rebounds to a maximum height of 1.61 m. What acceleration did the ball experience while it was in contact with the ground?

88. ## physics

A car travelling at 60 km/h hits a bridge abutment. A passenger in the car moves forward a distance of 67 cm (with respect to the road) while being brought to rest by an inflated air bag. What force (assumed constant) acts on the passenger¡¦s upper

89. ## Math

What is half of 850

90. ## TO M--urgent

I named that compound as cis and it should be trans. The I atoms are on opposite sides and that's trans, not cis.

91. ## math

are the length of a side of a square and the area of the square related proportionally?

92. ## Marketing

I am creating my own company (clothing store) and have to create a circle graph and frequency table, and explain how they can help my company. I don't know what to put in them. I know a circle graph is often choosen to compare things like the cost of

93. ## Calculus

Hello, my question is the following: The derivative of f(x) = ln(x) is given by f'(x) = 1/x. Find an equation of the tangent line to the graph y = ln(x) that passes through the point (0,0). So if I go through this using the typical method I use I have the

94. ## English

How do I turn this into a really good thesis statement? In the myth " When Grizzlies Walked Upright" explain how the bears lived in relation to each other before and after the introduction of the female into their clan, and explain how both the bears and

95. ## Math

4. What is the value of the expression below? |-4 -3| - |6 -2| -11 -3 3 11 *** 5. Which word phrase could represent the variable expression 3d + 5? Let d = Beth's age. five more than Beth’s age times three three times Beth’s age minus five five times

96. ## Math. I have a question.

Tom wants to build a pen in his yard for his dog. He buys 800 ft of fencing. He concludes that he can only build a rectangle with sides of 300 ft and 100 ft.

97. ## Biology

What is the water potential of a 5.7 L water in which 2.1 moles of NaCl has been dissolved at 30 degrees celcisus? Help please? Can you show work as well? It'll be greatly appreciated. Thanks in advance.

98. ## language arts poem by pat mora

how does the speakers mother fell about herself as a young girl

99. ## math

midpoint (4,13) endpoint (0,6). find the other endpoint

100. ## physics

A stone is thrown at 15 m/s an angle \theta below the horizontal from a cliff of height H. It lands 78 m from the base 6 s later. Find \theta and H.

101. ## math

A rocket ascends at an angle of 60.0˚ with the horizontal. After 1.00 min it is directly over a point that is a horizontal distance of 16.0 km from the launch point. Find the speed of the rocket.

102. ## Algebra 2

To estimate the size of a bear population on the Keweenaw Peninsula, conervationist captured, tagged, and released 50 bears. One year later, a random sample of 100 bears included only 2 tagged bears. What is the conservationist estimate of the size of the

103. ## physics

The mass of a robot is 6930 kg. This robot weighs 2520 N more on planet A than it does on planet B. Both planets have the same radius of 3.01 × 106 m. What is the difference MA - MB in the masses of these planets?

104. ## math

If the area of a rectangle is 2,460 square inches, what are its dimensions?

105. ## algebra 2

Solve each system of equation by grpahing? 3. y=-3x+6 2y=10x-36 4. y=-x-9 3y=5x+5

106. ## Biology

Why does biomass decrease as we move up the biomass pyramid?

107. ## physics

An airplane is 50,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the x-axis east, y axis north, and z axis up.

108. ## physics

Student wants to jump from their 3rd floor apartment window to the swimming pool below. The base of the apartment is 8.00 meters from the pool’s edge. If the window is 20.0 meters high, how fast does the student have to be running horizontally to make

109. ## Finance

1. What happens to companies with high operating leverage when the market declines? What happens when the market expands?

110. ## physics

A ball is thrown at 14 m/s at 57° above the horizontal. Someone located 30 m away along the line3 of the path starts to run just as the ball is thrown. How fast, and in which direction, must the catcher run to catch the ball at the level from which it was

111. ## us history

what are the four native languages in sc

112. ## Math 2--questions

7. Find the sum. –14 + 7 + (–3) –24 –18 –10 *** –4 8. A scuba diver descends 350 feet and then another 120 feet. Express the diver’s final depth as an integer. –420 ft 420 ft ** –470 ft 470 ft

113. ## CHEMISTRY

Does a molecular compound in water have hydration or have ionization ?

114. ## US History

Women made many contributions during World War I. Which area did they make the least impact? Nurses in the war Heavy industry Maintaining farms Truck drivers

115. ## Biology

1. Describe 2 methods of viral infection 2. How can a virus be helpful to its host? Thank you:)

116. ## Chemistry

500 g of Fe reacted with water to yield 4.2 g of H2. Fe3O4 was also produced in the reaction. What is the %yield of H2?

What happens to companies with high operating leverage when the market declines? What happens when the market expands?

118. ## Psychology

A recent research study found that surfing the internet and accessing non-academic grades resulted in lowering students GPA. Dr. Rushmore studied the relationship between grades and non-academic surfing in a first-year introduction to psychology class.

119. ## Math

Using the following cash flows for projects A and B, use payback period, discounted payback period, NPV, IRR, and MIRR to see if these are good projects or not. > Project A: (283,000); 46,000; 89,000; 104,000; 123,000; 187,000; and 72,000 > Project B:

Wellington’s Funds Flow Statement (Statement of Cash Flows) Sources Earnings after taxes \$ 80 Depreciation 84 Decrease in accounts receivable 42 Increase in accounts payable 13 Increase in notes payable 196 Increase in accruals 22 Increase in long-term

121. ## astro

ProximaCentauriisapproximatelythesamedistancefromEarth(slightly less than 4.3 light years) as Alpha Centauri A, but it has an apparent magnitude of +11.05, compared to Alpha Centauri A’s magnitude of -0.01. How much more luminous is Alpha Centauri A than

122. ## chem

/***\ \___/ hexane with a double bong in position 1-2 with 2 ch3 one on top one on bottom what would be the name of this

123. ## home economics

20 carriars in clothing and textile

asked by 20 carriers in clothing and textiles
124. ## Science

Suppose a geologist is studying two distinct areas next to a spreading ridge. The magnetic direction of the minerals in the oldest area is opposite to the magnetic direction of minerals in the newest area. a) Which area is closest to the center of the

125. ## Physics

A bike wheels rotate 4 revolutions. How radiant has it rotates?

126. ## physics

An electron in an atom has a speed of 2.2 × 10^6 m/s and orbits the nucleus at a distance of 5 × 10^-11m.a)What is its centripetal acceleration? b)A neutron star of radius 17 km is found to rotate at 5 revolutions per second. What is the centripetal

127. ## ap physics

2.7s , how far do you travel during this inattentive period?

128. ## chemistry

If 70.0 mL of water is added to 30.0 mL of 0.400 M solution of NaOH, what is the new concentration of NaOH?

129. ## Science

a car is moving at 80km/hr and slows down to 13km/hr in 9.75 seconds. Calculate the car's acceleration Formula for acceleration= Final speed-Initial/Time

130. ## quanta tive skills and reasoning

In a class of 250 students it was found that 140 took math 85 took psychology and 65 took both math and psychology how many students in the class took math or psychology?

131. ## history

There were many examples that inspired the reform-minded spirit after 1900. Which was not an example? Muckrakers Plessy v. Ferguson Triangle Shirtwaist Factory fire The Jungle

132. ## Math

Explain why the expression (x^2￼+ 6) ------- (x^3+3) , which seemingly can be simplified, actually cannot be simplified.

133. ## English

This is for "When Grizzlies Walked Upright" explain? How did the bears lived in relation to each other? How did the bears lived in relation to each other before and after the introduction of the female into their clan How did both the bears and the female

134. ## Finance

What happens to the cash flow statement for a company operating on a calendar year when a sale is made in December but the firm isn’t paid until the following January?

135. ## history

In the Seven Years’ War, Spain fought on the side of France right? Native Americans were unable to resist successive waves of European immigrants at least partially because they were divided among themselves. this is true right?

136. ## Math

1.) Find (f - g)(x) if f(x) = 2x - 5 and g(x) = 4. 2.) Given f(x) = 4 and g(x) = 2x - 1, find (f - g)(x). Thanks so much! :)

137. ## Health

What are positive attributes?

138. ## Simplify Practice.

Write the difference 30 – (–12) as a sum, then simplify. Evaluate the following expression. Show all steps. 18 + 6m for m = 2

139. ## Algebra 2

y-1 ____ x+3 = -3/4 (equivalent ratio) can you explain the steps which you use to get this answer and why you use them . I am sorry I am a disable student and it hard some time to grasp this math fo rme.

140. ## chemistry

230Th+He____223Po+2 2H+----- please complete this equation

141. ## math

what does this question mean : Sketch a graph to show four graphs in each family. a) y=(x-3)(x+6) b) y= (x+1)(x+1)

142. ## algebra

1 cm to the third of aluminum weighs 2.7 grams if a sheet is 0.003 8 find the weight

143. ## algebra

on an expressway, the recommended safe distance between cars in feet is given by 0.019v^2+v+14, where v is the speed of the car in miles per hour. Find the safe distance when the following takes place( round answer to three decimal places). v=35 mph

144. ## math

The sides a,b,c of a triangle are such that a^2+b^2+c^2=ab+bc+ca.What type of triangle is it?

145. ## Algrebra

A rectangular field is 3 yards longer than twice its width. If the perimeter is 156 yards. How wide is the field? 3*2=6 6*2=12 6*2*12=156 ??

146. ## English

What's the difference between the phrase: "It is not about you", and "It has nothing to do with you" Or do they necessarily mean the same?

147. ## physics

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.75 104 m/s, and the radius of the orbit is 5.15 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has

148. ## Pre-Calc

Help please Find f(2) and f(a+h) when f(x)=3x^2+2x+4

149. ## Math

explain why the expression (x^2+6) / (x^2+3) which seemingly can be simplified, actually cannot be simplified.

5pi over 4

151. ## Math problems.

Use the order of operations to simplify the expressions in the next two questions. 15 – 6 • 9 ÷ 2 + 10 16. 4 • (6 + 3) + 5

152. ## Algebra 2

Please help me with this problem and can you write down the steps. y-1 ____ x+3 = 3/4 (equivalent ratio)

153. ## Health

What are example of a psychosomatic response, when talking about stress?

154. ## Math one question?

A scuba diver descends 350 ft and then another 225 ft. Express the diver’s final depth as an integer. –525 ft –575 ft 525 ft 575 ft

155. ## math

Identify the solution(s) of the system of equations, if any. x + 5y = 6 6x - 15y = 18

156. ## history

Roosevelt addressed the struggles of industry with the National Industrial Recovery Act (NIRA). Which of the following was not one of the main components of this effort? African American labor assistance Public works projects National Recovery