# Questions Asked onSeptember 10, 2011

1. ## Chem

What is the amount of energy of calories to heat 8.5g of water from 15 C to 36 C? I think you take 8.5g x 21 degree C, but then I am stuck. Thank you

2. ## chemistry

calculate the amount of 95% marble required to obtain 11.2Litres OF CARBON DIOXIDE

3. ## physics

The figure shows the velocity of a solar-powered car as a function of time. The driver accelerates from a stop sign, cruises for 20 at a constant speed of 60 , and then brakes to come to a stop 40 after leaving the stop sign.

4. ## Chem

A mass spectrum of phosporus atoms shows only a single peak at a mass of 31 what can you conclude from this observation?

5. ## Chem

What are the Kilojoules needed to melt 24.0g of ice at O degrees C, warm the liquid to 100 degree C and change it to steam at 100 degree C?

6. ## MATH

solve the system of linear equations using the Gauss- Jordan elimination method x1- x2+ 4x3 = 15 x1+ x2 = X3 = 4 -3X1-X2 + X3 = -2

7. ## physics

A meter stick lies on the bottom of a 100 cm long tank with its zero mark against the left edge. You look into the tank at an angle of θ = 24°, with your line of sight just grazing the upper left edge of the tank, and h = 32 cm. (a) What mark do you see

8. ## finance

The Blinkelman Corporation has just announced that it plans to introduce a new solar panel that will greatly reduce the cost of solar energy. As a result, analys now expect the company’s earnings, currently (year 0) \$1 per share to grow by 50 percent per

9. ## Chemistry

What is the Wavelength( in nm) of the least energetic spectral line in the infrared series of the H atom? I don't understand how to find the least energetic spectral line?

10. ## physics plzz

In a game against the White Sox, baseball pitcher Nolan Ryan threw a pitch measured at 40.4 m/s. If it was 18.7 m from Nolan's position on the pitcher's mound to home plate, how long did it take the ball to get to the batter waiting at home plate? Treat

11. ## Physics

An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.1 km?

12. ## Psychology

Why is problem solving considered the highest level of mental activity? What makes an individual good at problem solving?

13. ## Home school community

what is three issues related to role confusion that a teacher may feel communicate?

14. ## math

solve the equation by factoring. 3x(x-5)=6x^2-16x

15. ## Chemistry

What are the joules needed to melt 50.0g of ice at 0 degree C and to warm the liquid to 65.0 degree C? Thank YOu

16. ## physics

A car moving with constant acceleration covered the distance between two points 60.0 m apart in 6.00 s. Its speed as it passed the second point was 15.0 m/s. (a) What was the speed at the first point? (b) What was the magnitude of the acceleration? (c) At

17. ## algebra

find the slope if it exists of the line containing the pair of points (7,1) and (10,-8) I have a slope of -3 is this correct?

18. ## math

the price of a jacket was reduced by10%. during a special sale, the price was discounted another 10%. what was the total percentage discount from the original price of the jacket

19. ## GEOMATRY

CONSTRUCT ANGLE ABC WHERE AB=AC=10cm AND BC=9cm .MEASURE AND WRITE DOWN THE SIZE OF ABC

20. ## Finance

Sports Novelties, Inc., has experienced an explosion in demand for its feathered football novelties. The firm currently (time 0) pays a dividend of \$0.25 per share. This dividend is expected to increase to \$0.75 per share 1 year from now. It is expected to

21. ## algebra

What is the value of x and KL if K is between J and L? JK=6x, KL=3x, and JL=27

22. ## Algebra

How to write an equation for this problem: A boat rental company charges a \$5 usage fee and \$10 an hour to rent a canoe. How long did you rent the canoe if you were charged \$45?

23. ## Algebra

How to write an equation for this problem: A boat rental company charges a \$5 usage fee and \$10 an hour to rent a canoe. How long did you rent the canoe if you were charged \$45?

24. ## algebra

5m+n=34 m-2n=9

25. ## College Algebra

It takes Todd 3 hours longer than Tom to paint a 4x5 feet bedroom. Working together, both can complete the job in two hours.How long does it take each one to complete the painting job working alone?

26. ## astronomy

the radius of earth is 4000 miles, how far would you travel in going around the equator?

27. ## physical science

A boy with a mass of 30 kg stands motionless at the end of a diving board 3 m above the floor. The boy has: Answer no energy. kinetic energy only. potential energy only. both kinetic and potential energy.

28. ## Algebra

The technology cewnter bought a fax machine for \$625.00 and it depreciates at a rate of \$25.00 a month. Find a function(f) that can be used to determine the value of the fax amchine (t) months after purchase. Would it be F(t)=25(t)-625

29. ## Physics

A plane flies from base camp to lake A, a distance of 300 km at a direction of 20.0° north of east. After dropping off supplies, the plane flies to lake B, which is 210 km and 30.0° west of north from lake A. Graphically determine the distance and

30. ## social studies

Although the Chesapeake and New England colonies differed in many ways, relations with Native Americans followed a similar course in both regions. Why? What were the biggest factors in relations between the two sides? Did relations change over time and

31. ## calculus

given that f(x)=x^11h(x) h(-1)=4 h'(-1)=7 find f'(-1)

32. ## Physics

A rocket starts from rest and moves upward from the surface of the earth. For the first 10s of its motion, the vertical acceleration of the rocket is given by a_y =( 2.70m/s^3)t, where the +y-direction is upward. 1) What is the height of the rocket above

33. ## biology 12

what is the best method useful for estimating the populations of eagles, and why? i orginally thought counting the number of nests. but i don't know why its the best way of estimating the population. can you plesae correct me if im wrong and help me with

34. ## maths P5

There were 335 children in a hall. 1/4 of the girls and 2/5 of the boys are swimmers. There are 110 swimmers in all. How many boys are there in the hall? (need non-algebra or model to solve, pls)

35. ## p6maths(non-algebra)

There were 1000 students at the parade ground and indoor sports hall. 40% of the 600 students at the parade ground were girls. 60% of the students at the indoor sports hall were girls. After some students in both venues moved from one venue to the other,

36. ## Mechanics

A tension test was performed on a steel specimen having an original diameter of 12.5 mm and gauge length of 50 mm. Using the data listed in the table, plot the stress–strain diagram, and determine approximately the modulus of toughness. Use a scale of 20

37. ## English

I used your synonym link. I included the words I found in parentheses. Can you check if they are appropriate, please? Thank you. ) The festival is held in Park City, Utah and represents one of the world’s premier showcases (synonym: main settings?) for

38. ## Algebra

graph the equation using the slopeand y intercept Y=1/6x +6 is the answer I graph at 0, 6 and 6, 0?

39. ## Finance

Zabberer Corporation bonds pay a coupon rate of interest of 12 percent annually and have a maturity value of \$1000. The bonds are scheduled to mature at the end of 14 years. The company has the option to call the bonds in 8 years at the premium of 12

40. ## gcse geography

suggest ways modern civilizations depend upon energy resources. fuel for cars , electricity for the house and for buildings. do you think these are right? can`t think of anything else. thankyou :-)

41. ## Physics

A ball is thrown straight up and passes point B(at a height of 45.6m above its starting point O) in 4.9s What was its initial speed? The acceleration of gravity is 9.8m/s^2 Answer in units of m/s. I think the answer is -14.7m/s but im not sure since you

42. ## AP Calculus AB

how do you solve limit approaching 0 of (sin^2x) / (x)

43. ## economics

According to the rule for optimal input usage, a firm should hire a person as long as his or her marginal revenue product is greater than his or her marginal cost to the company. It is well known that many companies have management training programs in

44. ## english

Which one is correct? 1) The distance between New Delhi to Mumbai is 600kms. 2) The distance between New Delhi and Mumbai is 600kms.

45. ## Physics

Tom the cat is chasing Jerry the mouse across the surface of a table 1.4 m above the floor. Jerry steps out of the way at the last second, and Tom slides off the edge of the table at a speed of 5.8 m/s. Where will Tom strike the floor?

46. ## Biochemistry

What volumes of 25 mM CH3COOH and 25 mM NaCH3COO are required to prepare 300 mL of a 0.25 M buffer of pH = 5.0? (pKa = 4.76) I keep getting something along the lines of 19ml for the conj. base..I know that's way wrong. help please!

47. ## physics

A man pushing a mop across a floor causes the map to undergo two displacements. The first has a magnitude of 200 cm and makes an angle of 120° with the positive x axis. The resultant displacement has a magnitude of 240 cm and is directed at an angle of

48. ## English

Can you please tell me if the word choice is correct? Thank you. 1) Marcus Shawcross believes that television has turned the average person into a mindless lump (synonym:a stupid mob?) 2) If he wore a shirt and a tie, he would look more suitably dressed.

49. ## bio 105

what describe one environmental issue/problem/challenge

50. ## science

sugar is one of the main sources of what for cells

what is WCA?

52. ## chemistry

The osmotic pressure of a solution containing 5.00 mg of an unknown protein per 10 mL of solution was 2.73 torr at 25 °C. Find the molar mass of the unknown protein.

53. ## physics

a room which is h = 9.0 feet tall and r = 12.0 feet wide. Attached to the ceiling is a piece of glass (with unknown index of refraction) which is 2.5 feet thick. A laser pointer in the bottom left corner is aimed so that the ray which reflects off the

54. ## trig

2x+5y+3=0 what is the value of sin theta

55. ## physics

Samantha is 1.32 m tall on her eleventh birthday and 1.57 m tall on her twelfth birthday. By what factor has her height increased? Isnt the answer 0.189?! because that doesn't seem to be the write answer

56. ## STRAYER

If \$795 is invested in an account that earns 11.75%, compounded annually, what will the account balance be after 27 years?

57. ## Algebra 1A

Find the slope intercept of equation of the line that has the given characteristics. Slope 3 and y interceot 0,7

58. ## science

sugar is one of the main sources of what for cells

59. ## Chem

Energy needed to keep a 75w bulb burning for 1 hour = 270kj Calculate energy neede to keep it burning for 3 hours? In J and kcal? I got the J: It is 270kj x 1000/1 x 3/1 = 810000=8.1 x 10^5J But How Do I get the kcal? Thank you

60. ## math

Trying to convert 465 litres of trunk space to inches or sq. feet. Need to know how many suitcases will fit

5(h-4)=8

62. ## geometry

A rectangle has sides of 22 ft and 30 ft you need to pour concrete 1ft wide and 4 ft deep how many cubic feet of concrete will you need?

63. ## maths

What are the steps to solve it? lim (x^2+y^2)/(sqrt(x^2+y^2+36)-6) as (x,y) approaches (0,0)

64. ## applied maths

A tram starts from rest atone station and comes to a stop one minute later at the next. It accelerates uniformly at 2m/s2 until it reaches a speed of 20m/s. It travels at this constant speed for a certain time until it decelerates back to rest at 4m/s2.

65. ## Math

find an equationof the line containing the given pair of points (2,4) (6,5)

66. ## geometry

If you have a circle in a square and r is the radius of the cicle and x is the measurement outside the square what would the formula be to find the area of the whole square using x and r?

67. ## physics

The speed of a point on a rotating turntable, which is 0.264 m from the center, changes at a constant rate from rest to 0.902 m/s in 1.94 s. At t1 = 0.64 s, find the magnitude of the tangential acceleration. Answer in units of m/s2 I assumed the velocity

68. ## English

I need to analyse the poem "At the Lunch Counter" by Alden Nowlan. Can anyone help me. It is for a year 8 exam.

69. ## World History Honors

What is it about Greco-Roman culture that creates positive feelings in people?

70. ## Earth/Space Science

Explain why scientific ideas that have been subject to many tests are still considered theories and not scientific laws.

71. ## cjs 220

what is the purpose of major crime reporting

72. ## ECON 405

As of July 26, 2011, the interest rate for a 20 year, A-rated Municipal bond was 5.0%. Assuming that your marginal tax rate is 25%, what would be the tax free equivalent rate on an A-rated, 20 year corporate bond?

73. ## ECON 405

10. As of this morning, the New Mexico Lottery power ball jackpot was reportedly worth \$111 million. The \$111 million dollar value is based on an annuity paying \$5.55 million per year for 20 years. Using a discount rate of 3%, what is the present value of

74. ## geography

Why are lines of latitude and longitude important? My answer--- They are important because they help you locate exactly where a certain location is. Do you think this is the answer my teacher is looking for?

75. ## geography

This is concerning Rotation. If it is dawn in the eastern United States, what is it in the western United States? Why? My answer --- It is nighttime. This is because the sun rises in the East and sets in the West. Is this correct?

76. ## geography

One more. If you are a resident of Canberra, Australia, are you a resident of an island or a continent? Is this a trick question? Because my answer is -- You are a resident of both an island and a continent. Is that right?

77. ## Science

At 518 degress celsius that rate of decomposition of a sample of acetaldehyde, initially at a pressure of 363 torr, was 1.07 Torr/sec when 5% had reacted, and 0.760 torr/sec when 20% had reacted. What is the order of the reaction?

Your decision to pursue a higher-level degree is based on investment in human capital. What are the marginal costs and benefits of pursuing additional education and the inherent risks associated with this decision?

79. ## Physics

In a total time of 25s, a field hockey player runs 25 m [26 degrees N of E] and then runs 32 m [18 degrees S of E] determine her average velocity.

80. ## chemistry

At 518 degress celsius that rate of decomposition of a sample of acetaldehyde, initially at a pressure of 363 torr, was 1.07 Torr/sec when 5% had reacted, and 0.760 torr/sec when 20% had reacted. What is the order of the reaction?

81. ## AP US History

To what extent would it be accurate to say that the New England, Middle, and Southern colonies had merged to create a single American Society by the outbreak of the revolution?

82. ## math

a theater seating 300 charges \$1 for children \$2 for students and \$5 for adult half as many adult and children and students areceipt totaled \$800 how many children aattend

83. ## Math

determine whether the system of alinear equqtion has one and only one solutions or no solutions find all solutions whenever they exits 3x- 4y =12 6x -8y =24

84. ## Information literacy

Which of the following is an article from a popular magazine?

85. ## com/155

write a paragraph to explain how purpose, audience, tone, and content impact academic writing.

86. ## BAF 260

How to find the after tax earnings on \$12,000 for corporate rates?

87. ## Pre-Calc

Find the area of the region between the graph of y=1/x, the x-axis, and the vertical lines x = 1 and x = 4.

88. ## physics

A locomotive is accelerating at 2.0 m/s2. It passes through a 20.0-m-wide crossing in a time of 2.8 s. After the locomotive leaves the crossing, how much time is required until its speed reaches 36 m/s?

89. ## Russian

Russia's historical roots date back to the? A)400s B)600s C)800s D)1000s

x

91. ## math

on the third weekly examination, the class average was 78. If the average had increased at the rate of p points perweek, the class average on the first examination was...

92. ## social study

suppose the president vettoed a bill passed by congress according to the information which of the following actions by congress would most likely ensure that the bill will become law?

93. ## biology

how do I draw a food web for a dog and a horse? arent they both primary consumers I have to answer this.

94. ## World Lit

A dialog between dead men by jorge luis borges. the guy who says "how grievous it is to see such a distinguished soldier brought low by the instruments of perfidy!" is this guy rosas or quiroga?

95. ## Physics

An airplane must reach a speed of 240.5 mi/h in order to take off. If the runway is 571.5 m long, what is the minimum value of the acceleration that will allow the airplane to take off successfully?

96. ## Physics

A rock is dropped from a tree of height 36.5 m into a lake (depth 9 m) below. After entering the water, the rock then floats gently down through the water at a speed of 12.5 m/s to the bottom of the lake. What is the total elapsed time?

97. ## Chem

Calculate the amount of heat required to heat a 3.8 gold bar from 30 to 67. Specific heat capacity of gold is 0.128 .

98. ## Pre-Calculas

The voltage E of an alternating current electrical circuit can be represented by the sinusoidal function E = 220 cos( t), where E is the measured in volts and t is measured in seconds. How long does it take the alternating current to complete one full

99. ## Statistics

Given the list 10,7,5,3,-6 find by hand, mean,meadian, midrange, mode(s), range, popvar, and sample standard deviation. (seven problems)

100. ## science

i need to make a taxonomic key for fruite apple orange strawberry banana can you help me with that

101. ## physics

a woman walks 2 km due east and then walks 4 km in the direction 30 degrees north of east. what is her magnitude of displacement from her starting point?

102. ## Math Gr. 9

a) Evaluate each power 3^1, 3^2, 3^4, 3^5, 3^6 b) Examine the final digit of each of your answers. What pattern do you notice? c)Use the pattern you found in part b) to determine the final digit in the number 3^3234. Explain. please & thankyou !

Do you think that in the Post-Washington Consensus the developing world will be better off economically and politically

104. ## algebra

Name the units in each rate.Then write a unit rate. 442 mi in 8.5 hr

105. ## Chem >Jai

Posted by Connie on Saturday, September 10, 2011 at 10:36am. What is the amount of energy of calories to heat 8.5g of water from 15 C to 36 C? I think you take 8.5g x 21 degree C, but then I am stuck. Thank you Chem - Jai, Saturday, September 10, 2011 at

106. ## french

What is le PMU in france and what graph could I use to represent it? i tried looking up information but am a little confused. Is it like betting on certain games?

107. ## Chem

How many KJ are released when 75.0g of steam at 100 degree C condenses cools to 0 degree C and freezes at 0 degree C? I set it up like this but it is wrong, What am I doing wrong: 75g x 2260J/1g water x 1Kj/1000J =

108. ## trig

What's the general solution for 3sin^2x+sinxcosx=2

109. ## chemistry

When 1.0 of gasoline burns, it releases 11 kcal of heat. The density of gasoline is 0.74 How many megajoules are released when 9.0 of gasoline burns?

110. ## English

I realized I didn't check some of the missing words... I'm posting you the sentences again. 1) Photo B shows a check-out clerk and a customer standing at the counter of a clothes department (or shop). The customer may have just bought a present for a

111. ## english

i need to find variations of certain words. what does this mean?

112. ## math

find the slope of the y intercept y=1.7x-3? I have the answer as 1.7,3

113. ## Maths

A geometric progression has a third term of 20 band sum to infinity which is three times the first term. find the first term.

114. ## Chemistry 12

How to draw the structural diagram of 2,3 dichlorohexane

115. ## math

find an equation of the line having the given slope and containing the given point m=-4(1,2)

116. ## English

I urgently need you to check these descriptions I wrote myself, mailny grammar and word choice. Thank you. 1)Photo A shows people in a business environment. There three women and a man sitting at a desk while another man is standing. This is writing

117. ## English

I left out the following sentences. I hope you can have a look at them. I need you to check the word choice, please. 1) Photo B shows a and a customer standing at the. The woman is paying her gift by credit card. 2) In the background I can see different

118. ## Social Psychology

Explain altruism from your point of view. Do you believe true altruism exists? Why or why not? Give one example, of yours are from someone else’s, of altruistic behavior (real or perceived). Hi Jiskha, I was able to explain altruism from my point of

119. ## french

what is le PMU of france and do you know were I can get a graph to represent it?

120. ## Gr. 9 Math

a) Evaluate each power 3^1, 3^2, 3^3,3^4, 3^5, 3^6 b) Examine the final digit of each of your answers. What pattern do you notice? I noticed that it ends with 3,9,7,1,3,9... etc c)Use the pattern you found in part b) to determine the final digit in the

121. ## physics

The figure shows the velocity of a solar-powered car as a function of time. The driver accelerates from a stop sign, cruises for 20 at a constant speed of 60 , and then brakes to come to a stop 40 after leaving the stop sign.

122. ## World History Honors

Why do modern people glorify the ancient world??

123. ## Physics

Two trucks having equal speeds hit their brakes at the same time, but truck has three times the acceleration as truck . Question:If truck B stops in time T, how long (in terms of T) will it take for truck A to stop?

124. ## biochem

I need to create a 100ml buffer with a pH of 4.00 using 0.100M Benzoic acid (pKa = 4.20)and 0.180M sodium benzoate. What volume of each material do I need to make this buffer? I think I need to use pH=pKa + log(A/HA)but am not sure if that is correct. Any

125. ## Physicsss

A typical virus is a packet of protein and DNA (or RNA) and can be spherical in shape. The influenza A virus is a spherical virus that has a diameter of 85 nm. If the volume of saliva coughed onto you by your friend with the flu is 0.023 cm3 and 10−9 of

126. ## algebra

xy squared-3z all over 3

127. ## statistics

a sample of 120 men and women randomly divided into 3 groups with 40 people per group. group 1 members varied their workouts. group 2 performed the same exercise at each workout. group 3 had no set schedule or regulations for their workouts. by the end of

How do I solve for T? PI(67.2/2)^2*T*13.6g/cm^3= 5lb*435.6g

129. ## math

CREATE AN EXPRESSION USING ALL 4 OPERATIONS AND AT LEAST 1 EXPONENT THAT WILL HAVE A VALUE OF 20

130. ## History

What was unique about Native Americans 1600? I know that they were one of nature, they were in tribes and had lots of traditions but these don't really seam unique

131. ## Maths

Amy had 20% more money than John. After she spent 50% of her money, she had \$72 less than John. How much money had she left?

132. ## Algebra 2

Exponential Notation Evaluate the following: x^-4 for x=2 I understand the -(2x2x2x2) equals 16 but the answer in the book says 1/16 How do you get 1/16?

133. ## maths

There were 335 children in a hall. 1/4 of the girls and 2/5 of the boys are swimmers. There are 110 swimmers in all. How many boys are there in the hall?

134. ## social studies

In what ways did English settlement patterns differ according to region and environmental factors?

135. ## math

what is the domain of the piecewise function f(x)={2x^2 -2,if x < or= 1 {x+1,if x>1?

136. ## earth

if the radius of the earth's orbit around the sun is 93,000,000 miles, what is the speed of the earth in it's orbit in miles per hour?

137. ## maths

Tickets for the Universal Studios amusement park are priced at \$32 for Senior Citizens,\$66 for adults and \$48 for children. There are 10 senior citizens in a tour group, the rest are adults and children. There were 2/3 as many adults as children. The total

138. ## Algebra 2

Exponential Notation Evaluate the following: x^3+y^-2 for x=-3 and y=4 I don't understand how to solve this equation. I solved it and got -11 as my answer but the books answer is -26 15/16 Thanks For Your Help

139. ## physics

A football is thrown upward at a(n) 23◦ angleto the horizontal. The acceleration of gravity is 9.8 m/s To throw a(n) 52 m pass, what must be the initial speed of the ball? Answer in units of m/s

140. ## Maths

Mdm P bought a tv set at a discount of 40%. GST(Goods and Services Tax)of 7% was charged for the purchase.She paid a down payment of \$433.35 which is 15% of the purchase price, inclusive of GST. What is the original price of the tv set?

141. ## physics

a roller whose diamater is 1.0m.weight 360N.what horizontal force is necessary to pull the roller over a brick 0.1m,heigh when the force is applied at the centre?

142. ## Physics

A jet plane lands with a speed of 110 m/s and can accelerate with a maximum magnitude of 7.00 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time interval needed before it can come to rest? (b) Can this

143. ## physics

How do you derive the equation for position vs. time from the velocity vs. time equation? For example let's say the velocity equation is v = 0.17t + -0.43 How would I go about figuring out the position vs. time equation with accurate numerical constants?

144. ## physics

plz anyway help me for the solution of this question. from the top of a tower P,a ball is thrown vertically upwards.when the ball reaches a distance h below P,its speed is double of what it was at height h above P.show that the greatest height attained by

145. ## Calculus

Let F(a) be the area between the x-axis and the graph of y=x^2cos(x/4) between x=0 and x=a, for a>0 (consider the area to be negative if the graph lies below the axis).

146. ## astronomy

what is the speed of a point on the equator in miles per hour as the earth rotates on its axis?

147. ## physics

A block of mass 1.4kg is placed on a rough surface. the coefficient of friction between the surfaces is 0.58. A constance force of magnitude 10N, making an angle of 37 degrees with the horizontal is acting on the block. the block is given an initial

148. ## Chemistry

the managing director of a well-known company on wall street thrives on a diet of fruit jam, bread, pasta, and coffee. She exercises intermittently. One day she decides to to her primary healthcare provider for a routine checkup. The healthcare provider

149. ## Science

Can someone please help me with these questions below thank you. 1. What do you think the impact of the earth's climate will be like if everyone enjoyed the same lifestyle? 2. What will it be like for The health of ecosystems and biodiversity? 3. What will

150. ## medical coding and billing

a patient is brought into the ER for attempted suicide and given iv drugs including glucagon and gastric lavage and aspiration and then transferred to psych facility what are the medical codes used for the facility services? i don't want answer i just want

151. ## Chemistry

differentiate alkenes and alkynes, cis isomers and trans isomers. Describe how cis-trans isomers are used for night vision

152. ## physics

A canoe has velocity of 0.40m/s southwest relative to earth.the canoe is on a river that is flowing 0.50m/s east relative to earth find the velocity (magnitude and direction) of the canoe relative to the river.

154. ## calculus

Evaluate h(x) for the following values of x? Consider the following function. h(x) = (tan(x)-x)/x^3 (a) Evaluate h(x) for the following values of x. (Give your answer correct to six decimal places.) x = a) 1 b) 0.5 c) 0.1 d) 0.05 e) 0.01 f) 0.005 what is

155. ## psycology

nisa has grown up in a small villegein the foothills. There was no electricity and water had to be hand pumped.they seldom saw people from the outside.when she entered school the bus had to pick her up

156. ## biology 12

what is the best method useful for estimating the populations of eagles, and why? i orginally thought counting the number of nests. but i don't know why its the best way of estimating the population. can you plesae correct me if im wrong and help me with

157. ## chemersty

Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter your answer with the correct number of significant figures. 885.75 g + 10.151 g - 25.50 g