Questions Asked onJanuary 11, 2014

1. Amaths

prove sin(A+B)/sin(A-B)=(tanA+tanB)/(tanA-tanB)

2. Geometry

Stephanie casts a shadow of 1.2m and she is 1.8m tall. A wind turbine casts a shadow of 10m at the same time that Stephanie measured her shadow. Draw a diagram of this situation and then calculate how tall the wind turbine is.

3. Physics

Two uniform solid spheres have the same mass of 3 kg, but one has a radius of 0.25 m while the other has a radius of 0.8 m. Each can rotate about an axis through its center. (a) What is the magnitude τ of the torque required to bring the smaller sphere

4. Chemistry

What would be the temperature change if 3.0g of water absorbed 15J of heat?

5. Honor's English

Which of the following describes the underlined phrase in the sentence below? The local softball team won the championship (against all odds). A) prepositional B) participial C) gerund D) infinitive Process of elimination: It cannot be C since a gerund

6. algebra

An exam consists of two parts, Section X and Section Y. There can be a maximum of 95 questions. There must be at least 20 more questions in Section Y than in Section X. Write a system of inequalities to model the number of questions in each of the two

7. English

Which of the following is a phrase fragment? A) Since the weather forecast is beautiful this weekend. B) Let's ask our parents if we can go tubing. C) Did you just say that? D) A great dog, thatâ€™s what we have! I can't determine if it's A or C.

8. math

Zoe, Minh, and Jake sold some tickets for a school fundraiser. Each ticket cost \$2. Zoe sold 1/2 of the tickets. Minh and Jake sold the remaining tickets in the ratio 1:3. If Zoe sold 36 more tickets than Minh, how much money dis the 3 students collect

9. Atomic Model/Science

A particular neutral uranium atom has 92 protons,143 neutrons, and an atomic mass of 235. How many electrons does the atom have?

10. Statistics

Students are being surveyed about the weight of books and supplies they are carrying as they attend class. a. Identify the variable of interest b. Identify the type of variable c. List a few values that might occur in a sample

11. Pre-Calculus

Solve sin (pi/4(x-6))=0.5, 0

12. algebra

use the binomial theorem to expand the binomial (s+2v)^5

13. Physics

A train traveling at a speed of 110 km/h uniformly decelerates for 20 seconds. During that time it travels 450m. A) What is the acceleration? (m/s^2) B) What is its speed after deceleration? (km/h) A ANS = -.805m/s^2 B ANS = 52km s = 450m t = 20 seconds u

14. Science

Which of the following would not be affected by a loss of vacuole function? The export of unwanted substances The production of ATP>>>>>>? The regulation of cellular pH The storage of food materials

15. Calculus

The following table displays the number of HIV diagnoses per year in a particular country. Year 1997 1998 1999 2000 2001 2002 2003 2004 2005 Diagnoses 2512 2343 2230 2113 2178 2495 2496 2538 2518 a) Using Curve Expert or another curve modelling program,

16. Science

The bacterium Caulobacter crescentus is able to form long cell envelope extensions that increase the surface area-to-volume ratio when placed in adverse environments. What is the likely function of these envelope extensions? To acquire nutrients To aid in

17. Science

Which of the following best describes an aspect of a membrane's molecular structure that causes it to be selectively permeable? Carrier proteins on either side of the membrane slow the traffic of large molecules into the cell. Nonpolar molecules cannot

18. physics

A small cube of mass m1= 1.0 kg slides down a circular and frictionless track of radius R= 0.4 m cut into a large block of mass m2= 4.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table. The cube and the block

19. algebra

Identify a pattern and find the next number in the pattern -0.8,-3.2,-12.8,51.2

20. maths

A large pipe has a diameter of 9.8×10^2cm.Water flows in the pipe at a speed of 5m s^-1.Find the volume in m^3,of water that flows out from the pipe every second,correct to 2 significant fogures.[Take pai as 3.142]

21. physics

A pelican ﬂying along a horizontal path drops a ﬁsh from a height of 4.3 m. The ﬁ!@#\$%^&ravels 8.3 m horizontally before it hits the water below. What was the pelican’s initial speed? The acceleration of gravity is 9.81 m/s 2 . Answer in units of

22. math

If the area of a circle increases by a factor of 9, by what factor does its circumference increase ?

23. chemistry who helps me step by step

25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. calculate the percentage of fe204 7h20 in the sample.

24. Amaths

prove tanA+tanB=sin(A+B)/cosAcosB

25. Physics

The gravitational force of attraction between two students sitting at their desks in physics class is 2.35 ✕ 10-8 N. If one student has a mass of 46.2 kg and the other student has a mass of 62.6 kg, how far apart are the students sitting?

26. PHYSICS(HELP)

A pendulum of mass m= 0.8 kg and length l=1 m is hanging from the ceiling. The massless string of the pendulum is attached at point P. The bob of the pendulum is a uniform shell (very thin hollow sphere) of radius r=0.4 m, and the length l of the pendulum

27. math

A right circular cylinder is to be inscribed in a sphere of given radius. Find the ratio of the height to the base radius of the cylinder having the largest lateral area.

28. Science

Are Mosquito Larvae decomposers?

29. physics

The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?

Through the tunnel by Dory Lessing 2 questions? 1. Richard and Jerry share similar character traits. Identify two ways these boys are quite similar. Use details and examples from the text to support your inferences. 2. both narrative selections selections

asked by lilan smith
31. physics

Pls help me with this, The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?

32. Ashford

Once they arrived in the United States, immigrants experienced a life very different from what they imagined. Which was not something that was most immediately part of their experience?

33. Chemistry

25g of a sample of ferrous sulphate was dissolved in water containing dilute h2s04 and the volume made up to one litre. 25ml of this solution required 20ml of N/10 kmn04 solution for complete oxidation. Calculate the percentage of f2s04 7h20 in the sample

asked by Ken Hung
34. Physics

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.6 m long. His speed at the bottom of the swing is 7.4 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that

35. physics

The resistance of a platinum resistance thermometer is 30 ohms at the ice point, 40 ohms at the steam point and 34.5 ohms on a certain hot day, what is the temperature of the day on celcius temperature day?

36. biology

Given below is the sequence of the mRNA ready for Translation" 5' - AUG CUA UAC CUC CUU UAU CUG UGA - 3' a) what is the first codon technically known as and which amino acid does it code for? b) how many amino acid residues will make the polypeptide chain

37. Chemistry

Assuming that seawater has a total ion concentration (aka colligative molarity) of 1.10 M conc, calculate how many liters of seawater are needed to produce 68.7 L of fresh water at 20 C with an applied pressure of 51.0 bar.

asked by Michael Stoll
38. science check my answers?

A car travels around a circular turn of radius 50 meters while maintaining a constant speed of 15 m/s. Find the minimum value for the coefficient of friction necessary to keep the car on the road. I got .40 for the minimum value of friction. In icy

39. math

Rewrite the equation 4x + y + 2 = 0 in slope-intercept form.

40. Science

Ms.Sue would you mind checking my answer? Question~ What make sit possible for plants to complete photosynthesis? _________________________________________ My Answer~ For plants to complete photosynthesis they need water,carbon dioxide and light.

41. maths

The scale of a map is 1:25000.Find the actual length of a road,in cm,which is measured 7.8 cm on the map.Express the answer in standard form.

1. Which of the following are conserved in a totally inelastic collision? Only momentum Only kinetic energy Both momentum and kinetic energy Neither momentum nor kinetic energy

Which is not a way to accelerate an object? a. speed it up b. slow it down c. change its direction d. apply balanced forces

44. 8th Grade Algebra

Taylor's front porch is rectangular. The length is 3 feet more than the width. The perimeter of the porch is 14 feet. What is the width of the porch?

45. Pre-Calculus

Here is correct question: Solve sin (pi/4*(x-6))=0.5, 0

46. Physics

dT/dz=−α for z≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea

47. physics

Under what circumstances does a double convex lens produce an image that is reversed left to right?

48. math

Use synthetic division to find the quotient and remainder. (r^2-2r+2), (r-1)

49. Accounting

The total assets of Capp Co. are \$600,000 and its liabilities are equal to two-thirds of its total assets. What is the amount of Capp Co.’s owner’s equity?

50. statistics

. Consider a football team for whom the numbers on the active players’ jerseys are 29, 41, 50, 58, 79, and 10, (listed in order of the players’ names). Does it make sense to calculate the means of those numbers? Why or why not?

51. math

Andrew has \$2.75 in nickels and quarters in his coat pocket. If he has a total of 15 coins, which system of equations could you use to find the number of quarters in Andrews coat pocket? 1)x+y=15 0.5x+0.25y=2.75 2)x+y=2.75 x+y=15 3)x+y=15 0.05x+ 0.25y=2.75

how do you explain the process and surrounding environment for the operational plan. I have a cleaning service

53. PHYSICS

dT/dz=−α for z≤11 km where α=6.5 K/km (Kelvin per km) and z is the height above the sea level. The temperature stays then approximately constant between 11 km and 20 km above sea level. Assume a temperature of 5 ∘C and a pressure of 1 atm at sea

54. math

What is the solution to x+5+x+1+x=3(x+2)+1 1)x=0 2)x=3 3)no solution 4) infinite I got #3 no solution x+5+x+1+x=3(x+2)+1 x+5+x+1+x=3x+6+1 3x+6=3x+7 -3x -3x 6=7 so no solution Is this correct? Thanks for checking over my work.

55. 8.01x Classical Mechanics

Sliding Blocks (14 points possible) A small cube of mass 1.0 kg slides down a circular and frictionless track of radius 0.6 m cut into a large block of mass 4.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table.

56. maths

The total population of the earth was estimated to be 6.42 billion people.Given that the total land surface area of the earth is about 1.5×10^8km^2.Find the average number of people living in 1 km^2 of land on earth,correct to 2 significant figures.Thanks

57. Chemistry

How is the high performance liquid chromatography column designed to ensure greater efficiency?

58. Chemistry

How can reaction intermediates in an organic synthesis be separated and recovered using thin layer chromatography?

59. Early child hood

what is formative assessment of progress

60. science

Is a bluegill both a decomposer and consumer?

61. math

solve algebraically and check y=8x+3 y=-4x-21 8x+3=-4x-21 +4x +4x 12x+3=-21 -3 -3 12x=-24 x=-2 y=8x+3 y=8(-2)+3 y=-16+3 y=-13 (-2,-13) check y=8x+3 -13=8(-2)+3 -13=-16+3 -13=-13 y=-4x-21 -13=-4(-2)-21 -13=8-21 so -13=-13 these check, so did I do this

62. Science

How does gravity keep the planets in motion around a star?

63. Literature Essay (Writeacher)

Writeacher, I truly need your help. I must finish this essay tonight but I am struggling. I read my thesis statement along with the first body paragraph, but it doesn't correspond whatsoever! I think I may need to rewrite the entire first paragraph. I

64. Math

y=1/2x+3 Slope? x-intercept y-intercept How do I graph this?

65. Chemistry

Draw condensed structural formula for... 2,3-dichloropropanoic acid

Okay, so I've figured this much out on my own, I just need help with the next part. It's a two block system with a friction of .20 a hanging mass of 7.5 kg and mass on the table at 10 kg. I got 3.08 m/s^2 for the acceleration and I got 22.8 N for the

67. math

what is 6/18 converted to a decimal?

68. Stuck on this Algebra 2 question!

what is the solution of the system of equations? 2x+2y+3z=-6 3x+5y+4z=3 2x+3y+4z=-10

A boy climbs to the roof of his house and drops a 0.40 kg rubber ball from the 7.5-meter peak of the house. How much energy was lost in the process? So I got 48 J is this correct? The bounce takes place over a 170 ms time interval. What is the impulse

70. writing

Emma is a leader in (who, whom) we have great confidence.

71. Math

Compute the Annual Percentage Yield (APY) for the investment in the previous question. (Round APY to the nearest hundredths of a percent.)

72. Math

The radiator of a car contains 20 liters of water. Five liters are drained off and replaced by antifreeze. Then 5 liters of the mixture are drained off and replaced by antifreeze, and so on. This process is continued until six drain-offs and replacements

73. Statistic

Consider a football team for whom the numbers on the active players’ jerseys are 29, 41, 50, 58, 79,…, 10 (listed in alphabetical order of the players’ names). Does it make sense to calculate the mean of those numbers? Why or why not? 2. The Fair

74. Math

the length of a rectangle is seven less than four times the width. Find the length if the area is 65 square units.

75. Science

Would Mosquito Larvae be considered an insect?

76. NEUROSCIENCE

freepdfhosting[dot]com/b75c984836.pdf replace " [dot] " with a period. HELP?

asked by Billy Jameson
77. Algebra

I need help understanding algebra

78. writing thesis statments

I am stuck on what would be a good thesis statement for my topic of, " How does drug addiction affect America as a whole?

79. Math

Select the x-coordinate of the vertex of the parabola defined by the function f(x) =-5x^2+7x+8

80. young child

A child have not learn the prerequisite fundamentals need for a combination of motor patterns is suffering from what

81. Fifth grade math

If a wom and a sail race who will it be