1. physics

a flute is essentially a pipe open at both ends. the length of a flute is approximately 66.1 cm. what is the third harmonic of a flute when all keys are closed, making the vibrating air column approximately equal to the length of the flute?

2. Chemistry

Knowing that delta h vaporization for water is 40.7 kj/ mol calculate p vaporation of water at 37 degress

3. Trigonometry

Please review and tell me if i did something wrong. Find the following functions correct to five decimal places: a. sin 22degrees 43' b. cos 44degrees 56' c. sin 49degrees 17' d. tan 11degrees 37' e. sin 79degrees 23'30' f. cot 19degrees 0' 25'' g. tan

4. derivatives

If the derivative of f is given by f'(x)=ex-3x2, at which of the following values of x does f have a relative maximum value?

5. PreCalculus

Cone Problem Beginning with a circular piece of paper with a 4- inch radius, as shown in (a), cut out a sector with an arc of length x. Join the two radial edges of the remaining portion of the paper to form a cone with radius r and height h, as shown in

6. Trigonometry

Sketch a height versus time graph of the sinusoidal function that models each situation. draw at lease three cycles. assume that the first point plotted on each graph is at the lowest point: a girl lying on a an air mattress in a wave pool that is 3 m

7. math

suppose you are drinking root beer from a conical cup. the cup has a diameter of 8 cm and a depth of 10 cm. as you suck the straw, root beer leaves the cup at the rate of 7 cm^3/second. at what rate is the level of the liquid in the cup changng when the

8. Pharmacy Tech

Rx: Prostaglandin E 10mcg/mL If the stock container of prostaglandin E is 100 mg/mL, how many 9-mL dilutions are required to prepare the ordered concentration?

9. geometry

Triangle ABC, AB=8, BC=10, and AC=12, M is the midpoint of AB, and N is the midpoint of BC. What is the length of MN?

10. physics

Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this:

11. math

how much money would have to be invested in an account at 3.98% annual interset to achieve a balance of 25,000 in 17 years if a. The account pays simple interest b. the account compound interest qrtly c. the account compounds interest continuously

12. Geometry

5. What theorem do Exercises 1-4 prove? (1 point) Triangle Inequality Theorem Converse of the Angle Bisector Theorem Angle Bisector Theorem Triangle Midsegment Theorem

13. Math

A baseball player hits a pitch when the ball is 2 feet off the ground. Two hundred feet from the plate, the ball reaches its maximum height of 82 feet. Will the ball clear the home run wall that is 10 feet high and 380 feet from home plate?

14. Physics

Consider the diagram of the box and bucket. If the coefficient of static friction is 0.5 and the coefficient of kinetic friction is 0.3, find the maximum mass of the bucket in order for the system to be in static equilibrium. If the block was given a

15. pre-calc

How do you find coterminal angles between 0 and 2pi for angles given in pi radians?

16. math

Bacteria are growing in a circular colony one bacterium thick. the bacteria are growing at a constant rate, making the area of the colony increase at a rate of 12mm^2 per hour. How fast is the radius changing when the radius is 3mm?

17. English

Please help me find these words in the book hatchet. These words are located in chapter 13-16 and all I need to knnow is where these words are located. I have found the book online and I have posted it underneath. I have done a couple of words all ready so

18. math

A baseball player hits a line drive to center field. As he rounds second base, he heads directly for third, running at 20 ft/sec. How fast is the distance from the rnner to home plate changing when he is halfway to third base?

19. Pre-Algebra

Can someone show me how to solve this problem step by step?Here is the problem, 26cm/s= m/min,how to solve it by convert rate suing dimensional analysis.

20. physics

Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this:

21. Trigonometry

Using exact values, find the value of: a. 12 sin 30 degrees ¨C 6 tan 45degrees + sec 45degrees / 52 12-1/2-6*(1) + ¡Ì2/52=¡Ì2/52 12-1/2-6+¡Ì2/52 what should i do next?? b. Sin2A + tan3A/2 - cos A + sec(a+ 15) Sin2A + tan3A/2 - cos A + sec(a+ 15)=

22. science

Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would

23. physical science

what physical law/s were used during the "burns" of Apollo 13 to adjust its path/trajectory and get it home? I know the thrusters used Newton's third law. What else?

24. physical science

Helium has the lowest boiling point of the elements. The slightest change in temp can cause it to vaporize and expand. To prevent pressure explosions, a line from the tank has a "burst disk" in case a of sudden pressure increse. then the diaphragm would

25. Pre-Algebra

Can anyone show me step by step how to solve this problem? 26cm/s = m/min convert this problem using dimensional analysis.What is the answer and how did you get it?Thanks,kj

26. physics

Three spheres, each with a negative chrge of 4.0x10^6C, are fixed at the vertices of an equilateral triangle whose sides are 0.20 m long. Calculate the magnitude and direction of the net electric force on each spehere. i used this:

28. Biography

What was Louis Armstrong's goals?

29. math

A ship is 400 miles directly north of the tahiti and is sailing south at 20mi/hr. another ship is 300 miles east of tahiti and is sailing west at 15mi/hr. at what rate is the distance between the ships changing?

30. Algebra

factor trinomial This is what I have so far don't know where to go from here 4h^2 + 8h - 5 (4h^2-2h) + (10h-5) 2h(h-5) + -5(2h-1) cant figure out what to do next

31. Algegra 1

The value v of a shopkeeper's inventory software program is given by v=-1/3t+3, where t is the number of years since the shopkeeper brought the program. What is the program worth 9 years after it is first purchased? Plot the point with the given t value 9

32. math

a cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of 1\4 g, find the work done by the cord on the block ? FIND THE WORK DONE BY THE FORCE OF GRAVITT

33. chemistry

If a person was locked in a perfectly insulated room 8 ft by 8 ft by 10 ft how long would it take the room temperature to increase from 75 degrees F to 100 degrees F? A person's body heat output is 100 watts and their volume is 3 cubic feet. Also, it is

34. functional english

How can i describe three different scenarios where stress can build up and affect a person? Also i have no idea on how to start! please help?

35. English

Can you please check these few sentences, please? In particular, I'm not sure about the vocabulary related to skiing equipment. Thank you. 1)Yesterday night we burst (set off) some firecrackers in the garden. Then we watched the fireworks from the window.

36. Calculus

Hi, I'm absolutely stuck on this problem. This is for a newton's method/linearization unit. Find an equation for the curve in the xy-plane that passes through the point (1,-1) if its slope at x is always 3x^2+2.

37. science

what are the steps to the scientific method?

38. science

which one of these is a possible reaction? Cl2 + Br2 Br^-1 + I^-1 I2 + Cl^-1 Br2 + I^-1

39. math

In a factory of electronic items, the total cost of production, expressed in thousands of dollars, is given by the function C(x)= (x^2-x+2)/x+1 where x belongs to [0;5] and expressed in hundrends of items produced. 1) calculate in dollars the total cost of

40. Biology

List and describe the steps involved when a gene in person's genotype is expressed to create a biochemical or physical characteristics that is a part of the persons phenotype.

41. statistics

3. You obtain the following regression statistics for the relationship between defect rate and volume at one of your plants. You have a random sample of results from 160 shifts at the plant.

42. english

The poor woman had some _______(happy) days. Hari is the _____ (idle) boy in the class. The ______ (long) lane has a twining. Hunger is the ______ (good) sauce. I congratulated him on his ______ (good) fortune. There was not the ______ (slight) excuse for

43. Algebra 1

The value v of a shopkeeper's inventory software program is given by v=-1/3t+3, where t is the number of years since the shopkeeper brought the program. What is the program worth 9 years after it is first purchased? Plot the point with the given t value 9

what is the difference between comparative & international criminal justice systems? explain with examples

45. Math

What do you get when you solve this equation where t = time in hours log t = (0.576 log (72/526) -0.176 Would it matter if t were in minutes? Thank you

46. Algebra

factor and solve 6d^2 + 2d = 10d + 35

47. GRAMMAR

I used these in sentences, I just need to know if they are verbs? 1.Education is 2.have taken 3.will give 4.worked 5.will be leading

48. Algebra 1

The value v of a shopkeeper's inventory software program is given by v=-1/3t+3, where t is the number of years since the shopkeeper brought the program. What is the program worth 9 years after it is first purchased? Plot the point with the given t value 9

49. Pre-Algebra

Victoria you helped me with the last problem can you help me again with this one please? 26cm/s=m/min. Convert this using the dimensional analysis.Thank-you.kj

50. science

how come there is a blackout period when the space shuttle goes behind the moon? Is it because radio waves can be transmitted through a solid object or through a vacuum or why?

51. science

Whose responsibility is it to reduce our impacts on climate?

52. science

Which of the following properties increase with increasing atomic number for fluorine and chlorine? I. melting point of the elements (yes) II. boiling point of the hydrogen halides A) I only B) II only C) Both I and II D) neither I nor II I think it's A -

53. math

Fadi is in a boat 3 kilometers away from the nearest point A at the sea shore.5kilometers away from A is the home of fadi. knowing that he can row 6km/hr and run 10km/hr.the objective of this exercise is to find the position of point B on the sea shore

54. Global

How did the Scramble for africa impact people living back then & living today?

55. algebra

show me how to find a slope?

56. math

What terms is missing from this set of ordered pairs? (0, -2)(?, 0)(5,8)

57. math

how do i simplify [(x^3/y^3) -1]/[(x^2+y^2)+(x/y)+1]

58. math

if you have a bill of 1.354 pesos ( philippines money) how can you it equal to a three family. example .Daniel 2 children Rolando 4 children Dante 5 children. how much will he pay per head of the family in order to equal a bill of each children to a bill

59. com170

I would like to know if there are any errors . like comma uuseage question marks,quotation mark, and apostrophes, capitalization, colons,semicolons, andcommonly misuesd words Why are many students choosing to pursue their college degrees using their home

60. java refractor

Why am I getting error called that the renaming refractor cannot apply in this context when trying to change a name in the netbeans? And how should I solve it? Please tell me quickly. emergency I need to submit my project tomorrow

61. algebra 2

Q(x)= x^2-6x+3, find Q(-3) I REALLY DON'T KNOW WHAT THE HECK ITS ASKING FOR

62. Pre-Algebra

can someone show me how step by step to convert this problem 45 mi/h=ft/s using dimensional analysis?Thanks.kj