# Questions Asked onSeptember 15, 2013

1. ## chemistry

To what pH should you adjust a standard hydrogen electrode to get an electrode potential of -0.124V V ? (Assume that the partial pressure of hydrogen gas remains at 1 atm.)

2. ## physics

A copper wire has a resistance of 0.425 at 20.0°C, and an iron wire has a resistance of 0.455 at the same temperature. At what temperature are their resistances equal?

3. ## physics

A battery of emf and negligible internal resistance is connected to two resistances R1 and R2 in series. What is the potential difference across R2?(a)E(R1+R2)/R2(b)E(R1+R2)/R1(c)ER2/R1+R2(d)ER1/R1+R2

4. ## science

An astronaut of mass 120 kg recedes from her spacecraft by activating a small propulsion unit attached to her back. The force generated by a spurt is 30 N. Show that her acceleration is 0.25 m/s2.

5. ## chemistry

The pKb of pyridine is 8.75. What is the pH of a 0.205M solution of pyridine?

6. ## math

There is something wrong with this definition for a pair of vertical angles: “If AB and CD intersect at point P, then APC and BPD are a pair of vertical angles.” Sketch a counterexample to show why it is not correct. Can you add a phrase to correct it?

7. ## Geometry

The running track at the right is a rectangle with a half circle on each end. FI and GH are diameters. Find the area insidevthevtrack to the nearest tenth.

8. ## physics

As part of a class project you are given 0.900 g of nichrome and asked to fabricate a wire with uniform cross-section. You use up 95% of the nichrome and make a wire with a resistance of 0.840 Ω. The resistivity of nichrome is 1.00 10-6 Ω · m and its

9. ## Physics

Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building

10. ## Physics

If you simultaneously drop a pair of tennis balls from the top of a building, they strike the ground at the same time. If one of the tennis balls is filled with lead pellets, will it fall faster and hit the ground first? Which of the two will encounter

11. ## physics

(a) What is the hot resistance of a 24 W light bulb that runs on 120 V AC? (b) If the bulb's operating temperature is 2700°C, what is its resistance at 2570°C?

12. ## Physics

A map suggests that Atlanta is 730 miles in a direction 5.00° north of east from Dallas. The same map shows that Chicago is 560 miles in a direction 21.0° west of north from Atlanta. The figure below shows the location of these three cities. Modeling the

13. ## physics

(a) What is the hot resistance of a 24 W light bulb that runs on 120 V AC? (b) If the bulb's operating temperature is 2700°C, what is its resistance at 2570°C?

14. ## math

how many four letter words can be made fro the letters p,a,y,m,e,n,t with no repetition of any letters?

15. ## trg

A plane flies in a direction of N70°E for 80 km and then on a bearing of S10°W for 150 km. a How far is the plane from its starting point? b What direction is the plane from its starting point?

16. ## Algebra 2

The air resistance R(in pounds) on a racing cyclist is given by the equation R=0.00829s^2 where s is the bicycle's speed (in miles per hour). a. What is the speed of a racing cyclist who experiences 5 pounds of air resistance? b. What happens to the air

17. ## physics

Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0 V batteries of a 740 kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 200 m high hill in 2.00

18. ## History

2.What sensory imagery can you use to describe the Taino perspective on the encounter with the Europeans? Does anyone have examples on this?

19. ## English

Which sentence is in the active voice? The girl jumped on the trampoline. The cake will be served to the queen. Is it the first one? But, if so, then how can the second sentence be written in the active voice?

20. ## Physics

A tennis ball is struck and departs from the racket horizontally with a speed of 29.1 m/s. The ball hits the court at a horizontal distance of 19.0 from the racket. How far above the court is the tennis ball when it leaves the racket?

21. ## Physics

At the 18th green of the US Open, Tiger Woods needs to make a 20.5 ft (6.25 m) birdie putt to win the tournament. When he hits the ball, giving it an initial speed of 1.57 m/s, it stops 6.0 ft. (1.83 m) short of the hole. Assume the deceleration caused by

22. ## chemistry

Suppose there are two known compunds containing the genetic elements X and Y. You have a 1.00-g sample of each compounds. One sample contains 0.33 g of X abd the other contains 0.42 g of X. Identify plausible sets of formulas for these two compounds.

23. ## physics

Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0 V batteries of a 740 kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 200 m high hill in 2.00

24. ## MATH

What is the smallest integer that can possibly be the sum of an infinite geometric series whose first term is 9?

25. ## Microscopes

Which part of the microscope should you use to carry it? a. the stage b. the eyepiece c. the focus knobs d. the arm Is it the arm?

26. ## Physical Education

What are the components of fitness? Are aerobic and anaerobic fitness, types?

27. ## math

if the expression(2ya)4 is equivalent to 16y8 what is the value of a

28. ## programming

where are the errors the pseudocode debugging exercise // This application reads student typing test data // including number of errors on the test, and the number // of words typed per minute. Grades are assigned based // on the following table: // Errors

29. ## Physics

A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.96 m to the north, d2 = 2.06 m northeast, and d3 = 1.13 m at 30.0° west of south (see the figure). Starting at the same initial point,

30. ## Classical Mechanics

During a track event two runners, Mary, and Alice, round the last turn and head into the final stretch with Mary a distance d = 2.0 m in front of Alice. They are both running with the same speed of v0= 5.0 m/s. When the finish line is a distance L= 45.0 m

31. ## Physics

A rocket is launched at an angle of 50.0° above the horizontal with an initial speed of 105 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 32.0 m/s2. At this time, its engines fail and the rocket proceeds to move

32. ## Math

Lin ride her bike 20 miles in 15 minutes. If she rode at constant speed what is the unit rate and how do you know ?

33. ## pelling

list of long a spelling words for a second grade student

34. ## statistics

Suppose scores on the mathematics section of the SAT follow a normal distribution with mean 540 and standard deviation 120. ACT math scores are normally distributed with a mean of 18 and a standard deviation of 8. What score on the ACT is equivalent to a

35. ## physics

A pellet gun is fired straight downward from the edge of a cliff that is 13.4 m above the ground. The pellet strikes the ground with a speed of 26.1 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?

36. ## Chemistry

When 25.302 is divided by 56.743, the answer should be reported to ____ significant digit(s). The result of the division, 25.302 / 56.743, reported to the correct number of significant digits is _______ When 56.743 is subtracted from 25.302, the result

37. ## Mechanics

Calculate the average horsepower required to raise a 200-kg drum to a height of 20 in a time of 1:0 minute. Show the solution and answer

38. ## Physics

A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 20.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a

39. ## Physical Science

a rocket moves through outer space at 11,000 m/s. At this rate, how much time would be required to travel the distance from Earth to the Moon, which is 381,000 km?

40. ## US History - Explorers

What tool did Henry Hudson use to help him explore? E.x. a compass, etc. What were his parents' names?

41. ## Calculus

Find k such that the line [y=5x-4] is tangent to the function : x^2-kx

42. ## physics

A police car is traveling at a velocity of 19.0 m/s due north, when a car zooms by at a constant velocity of 49.0 m/s due north. After a reaction time 0.600 s the policeman begins to pursue the speeder with an acceleration of 6.00 m/s^2. Including the

43. ## Physics

An astronaut of mass 120 kg recedes from her spacecraft by activating a small propulsion unit attached to her back. The force generated by a spurt is 30 N. Show that her acceleration is 0.25 m/s2.

44. ## Math

Alpha writes the infinite arithmetic sequence 10, 8, 6, 4, 2, 0... Beta writes the infinite geometric sequence 9, 6, 4, 8/3, 16/9,... Gamma makes a sequence whose n^th term is the product of the n^th term of Alpha's sequence and the n^th term of Beta's

45. ## understanding observation and behavior

answer to exam 405476RR penn foster

46. ## physics

A boat crosses a river of width 120 m in which the current has a uniform speed of 2.04 m/s. The pilot maintains a bearing (i.e., the direc- tion in which the boat points) perpendicular to the river and a throttle setting to give a constant speed of 2.58

47. ## psychology

•Why is determining abnormal behavior or a mental disorder so difficult

48. ## dma 040

42 inch cut into 3 pieces. Piece 2 is twice as long as 1st and 3rd piece. Piece 3 is three times as long as piece 1. How long are the pieces 1st board 2nd board 3rd board

49. ## chemistry

A 47kg sample of water absorbs 3.40×10^2kJ of heat. Part A If the water was initially at 21.5∘C, what is its final temperature?

50. ## trg

An earth embankment is 27 m long and has a cross-section shown in the diagram. Find the volume of earth needed to build the embankment.

51. ## Physics

When nitrogen(atomic mass=14,atomic number=7) is bombarded with neutrons, the collision resulted in disintegrations in which alpha particles are produced. Represent this transmutation in symbolic equation .

52. ## Stressed out!

I know this site is about homework help but I was wondering if you can kind of help me make a "decision" so I'm a freshman and I'm taking honors history this year. I'm so stressed out from taking notes every night and studying. I have a C in that class

53. ## algerbla

if the square of a postive number is decreased by five times the number , the result is 14. Find the number

54. ## English

1. A lot of studens are studying in the study room. (Can we use the term 'study' room' as a big place where students can study together? Do you have some other expressions for that?) 2. He is in the reading room with his friends to read books. (Is it

74. ## Math

Help on subtracting integers

75. ## Heeeeeeeelp

Read the following instructions in order to complete this assignment and review the example of how to complete the math required for this assignment: Use the properties of real numbers to simplify the following expressions: 2a(a – 5) + 4(a – 5) 2w –

76. ## dma 040

Area of a certain state(state1) is five times the area of another state(state2). If the sum of their area is 6,000,000 square miles, find the are of each state state1 state2

77. ## dma 040

Sports competition, France won more medals than Italy who won more medals than Korea. The total number of medals won by three countries is three consecutive integers who sum is 37, find the number of medals won by each France Italy Korea

78. ## Finance question

Suppose CAPM is true. You are considering investing in an equally weighted portfolio of two stocks, A and B. The betas of these stocks to the market factor are 1.10 and 0.80, respectively. The total return volatilities of stocks A and B are σA=0.20 and

79. ## Boston Tea Party

With the Boston Tea Party was it a group of British colonists who boarded the ships and destroyed the tea by dumping it in the Boston Habor?

80. ## math

Data collected from those who reported their credit card debt showed that the lowest average annual percentage rate on its credit cards was 0.019. Represent this as a percent. The lowest APR on its credit cars was __% ?

81. ## Physics

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 9.40 m/s and angle of 23.0° below the horizontal. It strikes the ground 6.00 s later. Initial velocity components: vx = 8.65 m/s vy = -3.67 m/s

82. ## math

Write the mixed number as a percent 6 ¾ Would it be 6(0.75) = 45% ?

Our large companies seem to be largely run by hired managers who work for salaries and who are not owner-entrepreneurs. How then do we get the profit motive into large companies?

84. ## chemistry

If a gas is made up of 3 parts hydrogen and 2 parts nitrogen...how much percentage of hydrogen is the gas made up of? The answer says 60%, but I don't understand how the came up with the answer

85. ## Math

5x/7+1/7-2x/4-6/4

86. ## chemistry

A 20.9 g sample of nitrogen gas combines completely with 4.5 g of hydrogen gas to form ammonia. What is the mass of ammonia formed? A 12.7 g sample of X combines with a 24.4 g sample of Y to form the compound XY2. What is the mass of the reactants?

87. ## chemistry

A 18.2 g sample of an unknown compound contains 0.7 g of oxygen. What is the percent by mass of oxygen in the compound?

88. ## chemistry

So I did an experiment at school in which we had to form 2.00 grams of precipitate by mixing 2 hydrated compounds. So for the products, obviously one of it is water, and the other 2 products are compounds, one of which, is insoluble. So when I measured the

89. ## physics

From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial SPEED of the pebble is 9.7 m/s and it was thrown DOWN (watch your signs).

90. ## Science

which of the following correctly identifies an SI unit and the tool that is used to measure it? a. meter, ruler b. degrees Fahrenheit, thermometer c. gram, scale d. millimeter, meniscus I can't decide between a and c.

91. ## Chemistry

A 18.2 g sample of an unknown compound contains 0.7 g of oxygen. What is the percent by mass of oxygen in the compound?

92. ## Pysch

______is to biological factors as ___________ is to cultural factors? a. Race; ethnicity b. nurture; diversity c. Individualism; collectivism d. Ethnicity; race

93. ## biology

what are the differences between a vein and an artery? Give your answer with reference to specific examples. I don't know how to refer to specific examples...please help me..

94. ## Math

Find k such that the line [y=5x-4] is tangent to the function : x^2-kx

95. ## Statistics

The annual snowfall in a town can be represented by the Normal model N(46, 6.8). In about 2.5% of the years, the annual snowfall in this town will exceed: A) 46 inches B) 39.2 inches C) 52.8 inches D) 59.6 inches E) 66.4 inches I don't know how to set this

96. ## Park University

The number of arrivals per period is distributed according to the Poisson with an expected value of 0.75 unit per period. The cost of waiting per unit per period is $3.20. The facility cost for serving one unit per period is$5.15. What expected service

97. ## physics

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.49 m. If, in the course of an hour, the frog spends 32.5 % of the time resting and 67.5 % of the time performing identical jumps of that maximum length, in a straight

98. ## algebra

if f(X)=x^1/3+ 1/3x what is the value of f(27)

99. ## social studies

what is a culture and the types of culture

100. ## Research

Is it possible for someone to become deaf and mute at the age of ten while they were perfect before? If so, then what could be a reason that would lead them to lose both hearing and talking? Thank you in advance! All help is greatly appreciated :)

101. ## Chemistry help needed

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

103. ## algebra

how do i solve ã(x+4) =y+2 solve for x.

104. ## algebra

I need to find the x coordinate of the vertex of parabola defined by f(x)= -5x^2 + 9x + 2 Can you please show steps. Thank you

105. ## 104 cilivi history

the Indian ocean was largely spared large-scale warfare because

106. ## algebra

How do I solve this problem  ã2x -7+8=11

107. ## His 104 civilization 11

the Indian ocean was largely spared large-scale warfare because

108. ## ALGEBRA

HOW DO I SOLVE THIS PLEASE 5ãx =ãx -12

115. ## English

I'm embarrassed I can't figure this out on my own but I can't so here I am. I was giving these words and told to put them in " Letter by Letter Alphabetization " I'm confused by this and don't know how to figure out which word goes first and why. Please

116. ## algebra

can someone help me with this please 2/3 ãx =8

117. ## Physics

Two colliding objects exert equal and opposite forces on each other (Newton's Third Law). However, acceleration experienced by an object is inversely related to its mass: the smaller the mass, the larger the acceleration for a given force (pp. 49-50).

118. ## math

How do I write this decimal, 0.44 as a percent?

119. ## chem quantity

a sample of soil containing hydrated barium chloride potassium chloride plus inert material weighd 0.8076g. tha sample was then dissolvd in water n treated with silver nitrate.tha resulting precipitate was collectd n found to weigh 0.5846g. calculate tha

120. ## quantummechanics

The following circuit is designed for testing whether |u⟩=|v⟩. The three-qubit gate in the middle is called the controlled SWAP gate, which swaps the last two qubits if and only if the first qubit is 1 (a) If |u⟩=|v⟩=|+⟩, what is the probability

121. ## arithmetic

If I WALK FROM MARKER 8.8 MILE TO MARKER 11.8 MILE HOW FAR IS THAT?

122. ## physics

WHAT IS THE REASON BEHIND THE JISKHA"S TEACHERS TO BE NOTHING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(except Writeacher and STEVE) ARE THEY DAFT OR NUISANCE!!!!!!!!!!!!!!!!!! ANSWWER Me QUICKLY !!!!!!!!!!!!!

123. ## physics

I=0.5E0EO²C where E0 is the permitivity of the vacuum and C is the velocity of light. a)Show that the units of the equetion are consistant b)A certain helium-neon laser emits 0.20mW in a beam of cross sectional area 3.0mm.Determine the peak values of the

124. ## biology

Question: How many hydrogens are in this image? Image: oi43.tinypic[dot]com/2hxwql1.jpg (Replace [dot] with a period (.)) Oiriginal Question: (A) Enter the formula for Tamiflu by typing the number of each atom in the blanks. If Tamiflu does not contain any

50 compound

126. ## science

which of the following correctly identifies an SI unit and the tool that is used to measure it? a. meter, ruler b. degrees Fahrenheit, thermometer c. gram, scale d. millimeter, meniscus I can't decide between a and c.

127. ## physics

An electrical source with internal reistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?(a)R+r/R(b)R-r/R (c)R/R+r (d)R/r

128. ## Creative Writing

"I'm sorry," her voice was broken by her tears, "I'm so, so sorry!" Is that line written properly, or would you write it like [ "I'm sorry." Her voice was broken by her tears. "I'm so, so sorry!"]

129. ## Math

For what constant value a is the following function continuous at x= -10 ? f(x)= (1/x+1/10)/(x+10) when x is not -10 f(x)= a when x= -10

130. ## Algebra

Find the average speed Hike 52 miles in 3 days Drive 69 kilometers in 3/4 hour

131. ## integrated algebra ME 1

identify the sample and suggest a population from which it was selected. then classify the sample as sample, stratified, or systematic. explain your reasoning. 1} an insurance company checks every hundredth claim payment to ensure that claim have been

132. ## math

What is the fraction as a percent 7/800? I divided 7 by 800 and got 0.00875 and moved the decimal two places to the right, would that be right .875% ?

133. ## health care

This week, you will create a PowerPoint presentation to help you prepare for your Final Paper. Submit a 10-slide (excluding title and reference slides) PowerPoint presentation that provides an overview of your research thus far for your Final Paper.

134. ## math

i need to know how to work this problem out step by step..[-16*-11/(4-9)] thank you

135. ## grammar

my brother played some music

136. ## Physics

A ball is thrown upward from the ground with an initial speed of 23.2 m/s; at the same instant, another ball is dropped from a building 20 m high. After how long will the balls be at the same height?

137. ## algebra

R=ã(3V/ƒÎH) solve for V.

138. ## Calculus

f(x) = 4/5x i need to find the derivitave but i don't know how to start this one. I know the derivitave of 4 is just zero, and i know the derivative of 5x is 5. But the answer isn't 0/5. Help please.

139. ## Math

Y=2x^2 ;(1,2) ,(3,18)

140. ## math

write the verbal rule for the pattern 13, 14, 15, 16. Find the 15th term in each.

141. ## Math

(5x+1)/7-(2x-6)/4>_-4

142. ## English

1. What are you going to do for Chuseok? 2. What are you going to do on Chuseok? 3. What are you going to do during Chuseok? (Chuseok is a Korean Thanksgiving Day. What is the difference of the three sentences?)

143. ## Chemistry

Calculate the wavelength of a proton with energy 2.45 eV.

144. ## Flowers for Algernon

Explain Charlie's problems with women. Why does he have trouble getting close to them?

145. ## law

can any of the common law defenses be applied, or have been applied, to cases involving capital punishment

146. ## Chemistry

Moles of Cu in the copper sulfate salt: mass is 90. and there are 5g of copper sulfate

147. ## Flowers for Algernon book

Think about all the times knives or razors appeared in the story. How could they be symbolic?

148. ## chemistry

Express the following numbers in scientific notation. (c) 0.9589 (d) 745 (e) 74100 (f) 0.002031

149. ## math

a=(4.8km/h - 4.5km/h)/.5h

6/14=7/x-3

151. ## ALGEBRA

5x-3y=2x-xy solve for x

152. ## Algebra

Four times a number is eight more than twice the same number

153. ## food styles of catering

At which of the following events are you likely to serve only champagne as the wine

154. ## Physics

A rocket is fired at a speed of 96.0 m/s from ground level, at an angle of 35.0 ° above the horizontal. The rocket is fired toward an 15.2-m high wall, which is located 32.0 m away. The rocket attains its launch speed in a negligibly short period of time,

155. ## Math

Illustrate two real-life example of the fraction 0/6? I need help coming up with the second one. This is my 1st one "The amount of money of six business owners get if the business has a profit of \$0."

156. ## Chemistry

Expected number of moles of copper oxide (using the emprical formula of copper oxide and the starting moles of Cu)

157. ## World History

How are paintings similar to or different from public murals created today?

158. ## law

The insanity Defense can be used in cases involving capital punishment, correct?

159. ## maths

A truck rolls down a hill subject to acceleration due to gravity and resistance (including air resistance, rolling friction, etc) and the distance si (metres) travelled after ti seconds is observed. Classical mechanics predicts that the distance travelled

160. ## world geography

you are an investor in virginia compny.in order to make a profit,you must encourage people to leave england and move to jamestown.create an advertisement describing the advantages of living in virginia.

161. ## physics

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.25 m/s. The car is a distance d away. The bear is 39.8 m behind the tourist and running at 7.36 m/s. The tourist reaches the car safely. What is the

162. ## Science

To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

163. ## Chemistry

To determine v max and km of Beta-galactosidase for lactose, the same amount of enzyme (1 ug per tube) was incubated with a series of lactose concentrations under conditions where product concentrations remained negligible. At each lactose concentration,

164. ## Math

When is 15xy+9y^2+6x^2 divided by 2x+3y. Thank you

165. ## Math

When mn+m^2-30n^2 is divided by m-5n, what is the quotient. Thank you