Ruth

Most popular questions and responses by Ruth
1. Pre calc

evaluate the expression under the given conditions. cos(θ − ϕ); cos(θ) = 5/13, θ in Quadrant IV, tan(ϕ) = − square root15,ϕ in Quadrant II Anyone know how to do this I have never been this confused in my life

asked on April 11, 2017
2. Maths

Two boats A and B left a port C at the same time on different route .B travelled on a bearing of 150 degree and A travelled 8km and B had travelled 10km ,the distance between the Two boats was found to be 12km .calculate the bearing of A's route from C.

asked on June 13, 2017
3. chemistry

What separatation method used to separate silver chloride (solid))and sodium trioxonitrate

asked on January 12, 2018
4. Econ/stats

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) \$34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line

asked on April 29, 2012
5. Geography

What is the relation between geography and chemistry

asked on October 19, 2011
6. maths

Three bags of wheat,two bags of corn, and one bag of oats weigh the same as one bag of wheat,one bag of corn and five bags of oats,if two bags of corn and one bag of oats weights 25 pounds and one bags of corn weights 10 pounds,How much does one bag of

asked on October 8, 2016
7. physics

a galvanometer has a resistance 60 ohm and is of 5mA full scale deflection.how would you modify it so as to get 0-10V voltmeter

asked on March 6, 2016
8. Chemistry

Hydrazine has the formula N2H4 and is used as a rocket fuel (e.g. for the Apollo moon rockets). It burns in the following reaction for which the enthalpy change is -583 kJ/mol. N2H4(g) + O2(g) → N2(g) + 2 H2O(g) Calculate the N-N bond enthalpy in

asked on November 15, 2017
9. Chemisty

How do i convert 0.0024 to scientific notation

asked on January 11, 2010
10. maths

A straight highway leads to the foot of a tower of height 50m. From the top of the tower, the angles of depression of two cars standing on the highway are 30 degree and 60 degree. What is the distance between the two cars and how far is each car from the

asked on October 17, 2013

The height y (in feet) of a baseball thrown by a child is y = -1/10 x^2 + 3x + 6 where x is the horizontal distance (in feet) from where the ball was thrown. Will the ball fly over the head of another child 30 feet away trying to catch the ball? (Assume

asked on September 25, 2014
12. geography

what factors account for the similarities and differences between the subdivisions in tropical climate zones?

asked on September 9, 2012
13. Chemistry

Describe the manner in which ketohexose acts as a reducing sugar in the Benedict test.

asked on September 16, 2008
14. History

Is this ok? The Industrial Revolution was a period from the eighteenth to the nineteenth century during which major changes in agriculture, manufacturing, mining, and transport had a massive effect on the social, economic,and cultural conditions starting

asked on March 4, 2010
15. physics

A stunt flier is moving at 15m/s parallel to the flat ground 100m below,how large must the distance x from plane to target be if a sack of flour released from the place is to strike the target?

asked on October 8, 2017
16. Algebra

How do I answer this? Robert needs to cut four shelves from a board that is 2.5 meters long. The second shelf is 18 centimeters longer than twice the length of the first shelf. The third shelf is 12 centimeters shorter than the first shelf. The remaining

asked on April 13, 2015
17. math

A limited access highway had an access reduction and lost 1/13 of its exits. If 264 of its exits were left after the reduction how many exits were there originally?

asked on May 9, 2013
18. chemistry

calculate the total vapour pressure of mixture of methanol(64g) and ethanol(92g) at 298K given that the pure vapour pressure of methanol is 90mmHg and ethanol is 45mmHg (C=12, H=1, O=16)

asked on May 24, 2019
19. physics

1)a galvanometer has a resistance of 40 ohm and is of 3 mA full-scale deflection.how would you modify it to act as a 0-5 A ammeter? 2)the galvanometer described in question 1 is to be converted into a 0-5 V voltmeter. a)when the voltmeter is connected to a

asked on March 2, 2016
20. chemistry

what are the limitations of depression of freezing point

asked on May 25, 2019
21. Chemistry

Give a acid-base pairs which produce Na2CO3 as a salt

asked on October 8, 2014
22. writing

The cost of new homes is high today. Many people are purchasing older homes in need of renovation. the most effective combination of sentences 1 and 2 would include which of the following groups of words? 1) although many homes need renovation 2)although

asked on June 10, 2011
23. life orientation

how can i advise a friend who response to a conflict avoidance that is not a healthy for sustaining positive relationship

asked on February 3, 2019
24. pre calc

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 600 m away measures the angle of elevation to the spot of light to be 45°. Find the height h of the cloud

asked on March 27, 2017
25. Pre calc

sin(θ − ϕ); tan(θ) = 5/12 θ in Quadrant III, sin(ϕ) = − sqaure root10/10 ϕ in Quadrant IV. I used the sin equation sin(a)cos(b)-sin(a)cos(b) However I am still getting the wrong answer

asked on April 11, 2017
26. writing

Still, do-it-yourself renovations is usually a source of pride for new homeowners, no matter how hard or how frustrating. what correction should be made to this sentence? 1)remove the comma after still 2)change is to are 3) change the spelling of usually

asked on June 10, 2011
27. Math

2500 students take a college entrance exam. The scores on the exam have an approximate normal distribution with mean u = 52 points and a standard deviation o = 11 points. Estimate the percentage of students scoring 52 points or more. ^ How would you do

asked on May 7, 2013
28. Physics

A driver in a car traveling at a speed of 21.8m/s see a cat 101m away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 90m?

asked on October 25, 2010
29. physics

Helium gas occupies a volume of 0.04 m 3 at a pressure of 2 x 10 5 Pa (Nm -2 ) and temperature of 300 K. Calculate (i) the mass of the helium. (ii) the r.m.s. speed of its molecules. (iii) the r.m.s. speed at 432 K when the gas is heated at constant

asked on October 24, 2016
30. physics

an electron moves in the plane of paper toward the top of the page .a magnetic field is also in the plane of the page and directed toward the right .what is the direction of the magnetic force on the electron ?

asked on March 10, 2016
31. writing

Doctors in the field of preventive medicine concentrate on "preventing disease and to encourage" good health practices. Best way to write the portion? 1) preventing disease and to encourage 2)prevent disease and to encourage 3)to prevent disease and to

asked on June 10, 2011
32. Math

An arc of lemgth 28cm subtends an angle at the centre of a circle. In the same circle, what angle does an arc of length 35 subtend

asked on March 9, 2018
33. Organic Chem

Write a balanced equation showing the reaction of trimyristin and aqueous NaOH

asked on October 10, 2011
34. English Criticism

POEM FOR ELSA by Michael Roberts THAT day the blue-black rook fell pitifully dead You wept and stormed, tossing your lovely head, Hurling commiseration into broken skies That wept and wept, vainly as any eyes. You pitifully wept, nor would be comforted

asked on November 22, 2008
35. writing

They emphasized the importance of good maternal and child health care, including the administering of vaccines. what correction should be made to this sentence? 1) replace they with it 2) change emphasized to emphasize 3) change the spelling of importance

asked on June 10, 2011
36. mathematics

in a class of 50 student,18 offered mathematics, 21 offered chemistry while 16 offered biology, 7 student offered mathematics and biology, 9 student offered chemistry and biology while 5 student offered the three subject combination. a) find the numbers of

asked on May 29, 2019
37. maths

The shadow of a tower standing on a level ground is found to be 2x meters longer when sun's altitude is 30 degree than when it was 45 degree.Find the height of the tower.

asked on October 17, 2013
38. writing

Sentence 10: Finally, friends whom you haven't seen in years, long-lost relatives, and even mere acquaintances will begin calling in february to plan a lengthy visit with you in the summer. what correction should be made to this sentence? 1)change friends

asked on June 10, 2011
39. introduction to oorganisational psychology

conflict has always been a part of our lives, especially in the decision making processes. write down a case of multiple approach-avoidance conflict that you have experienced personally. how did you react? do not forget to include all the variance of this

asked on March 4, 2016
40. mathematics

perform the indicated operation and express your result In a standard form i) (4+3i) + (6+4i) ii) 3 + 4i/6+3i

asked on May 29, 2019
41. Math

A bucket when a fifth full holds 10 litres .How many litres will it hold when it is full?

asked on October 29, 2018
42. Algebra

Martina hits a volleyball with a velosity of 13 m^s. When she hits the ball it is 1m above the ground. How long will ot take for the ball to hit the ground.

asked on January 15, 2016
43. physics

A man of mass 67.1 kg stands on a scaffold supported by a vertical rope at each end. The scaffold has a mass of 24.6 kg and is 3.6 m long. Suppose the man stands to the right from the middle of the scaffold that is a distance one sixth of the length of the

asked on November 15, 2011
44. History

Hello. I am doing an essay on the impact of the industrial revolution. I have done the intoduction and two paragraphs. Please can you give me some feedback. thanks What was the impact of the Industrial Revolution The Industrial Revolution was a period from

asked on March 3, 2010
45. math

The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires every year. This year, 50 new hires took the test and scored a mean of 111.6 points with a standard deviation of 14.3. Last year,

asked on December 14, 2018
46. Statistics

Let X1;X2;X3;...;X6 be a random sample from a distribution with the following probability desity function: Fx(x) = (1+4x)/3 for 0

asked on August 10, 2006
47. physics

describe the force board experiment to show how to obtain the resultant of two non-parallel coplanar forces acting at a point.

asked on September 12, 2018
48. Physics

7. In a meeting room, there are chairs, a table, and people. Which of these things has a temperature a) lower than, b) greater than, or c) equal to the temperature of the air?

asked on April 27, 2010
49. Biology

List 15 mechanical and 15 biological vectors and the diseases they transmit.

asked on November 13, 2018
50. College Algebra

Use rational root theorem and the factor theorem to help solve the following equation X4-2x3-13x2+38x-24=0

asked on November 6, 2011
51. physics

Suppose a person weighs 160 pounds on Earth. How much would that person weigh on a planet that was three times as massive as Earth and had a radius that was twice that of Earth's?

asked on September 29, 2011
52. Physics

A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?

asked on August 24, 2014
53. physics

Superman throws a boulder of weight 3800 N at an adversary. What horizontal force must apply to the boulder to give it a horizontal acceleration of 13.5 m/s^2?

asked on October 19, 2011
54. mathematics

find the modulus argument and principal argument of each of the following a) i b) -√5

asked on May 29, 2019
55. Econ/stats

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) \$34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line

asked on April 29, 2012
56. maths

jimush walks 40m eastward and 30m southward the angle made between the two distance is 90degree calculate the other angels

asked on October 13, 2019
57. statistics

Bellevue Hospital in New York City uses 100.6 degrees F as the lowest temperature considered to indicate a fever. a. What percentage of normal and healthy adults would be considered to have a fever? b. Does this percentage suggest that a cuttoff of 100.6

asked on May 9, 2010
58. math

Express 4.050505... as a fraction

asked on August 20, 2018
59. physics

What is quantity of heat required to melt down completely 1kg of ice at 30 degree celsius

asked on May 18, 2016
60. PYSICS

The upward normal force exerted by the floor is 600 N on an elevator passenger who weighs 610 N. What is the reaction force to the upward normal force exerted by the floor? What is the reaction force to weight of the passenger? What is the magnitude of the

asked on October 19, 2011
61. physics

a conducting loop consisting of a half circle of radius r=0.2m and three straight sections the half circle lies in a uniform magnetic field B that is directed out of the page the field magnitude is given by B=(4t^2 + 2t + 3)T .w/r t is in second. an ideal

asked on March 31, 2016
62. Math

Find the square root of 25xsquared-40xy+16ysquared

asked on September 15, 2017
63. History

This is my introductory paragraph. The Industrial Revolution was a period from the eighteenth to the nineteenth century where major changes in agriculture, manufacturing, mining and transport had a massive effect on the social, economic and cultural

asked on March 4, 2010
64. Chemistry

If 20g of NaCl was used to form a 250cm3 of saturated solution of NaCl at 25oC. Calculate the solubility of the salt in mol/dm3 at that temperature. (Relative density of solution-1).

asked on December 12, 2018
65. physics

what is the potential energy of 4 point charges each of value Q at the corners of a square of side length a.

asked on December 28, 2015
66. Pre calc

A 20-ft ladder is leaning against a building. If the base of the ladder is 7 ft from the base of the building, what is the angle of elevation of the ladder? (Round your answer to one decimal place.) How high does the ladder reach on the building? (Round

asked on April 4, 2017
67. physics

find the drift velocity of the electrons in the copper wire (there are 8.5*10^28 free electrons per m^3 in copper)

asked on February 18, 2016
68. Math

Determine the number of diagonals in a regular 40-gpn

asked on September 13, 2013
69. Algebra

Parking in a student parking lot costs 2.00 for the first half hour and \$1.75 for each hour thereafter. A partial hour is charged the same as a full hour. What is the longest time a student can park for \$9.00? Show your work.

asked on March 9, 2013
70. math

the radius r of a sphere is increasing at a rate of 3cm/min. find the rate of change of the area when r=3cm

asked on February 22, 2016
71. Math

Tanker boats cannot be in the bay when the depth of water is less or equal to 25 feet. Set up an inequality and solve it graphically to determine all points in time, t, on the interval 0 less than or equal to t less than or equal to 24 when tankers cannot

asked on August 22, 2012
72. Chemistry

Calculate ∆Hºf /mol for propane, C3H8(g), given the following reaction: (10 points) C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(ℓ ); ∆Hºrxn = -2219.9 kJ

asked on April 9, 2012
73. Algebra (Work Problem)

Susan's backyard has three faucets: A, B and C. If she turns on all three of them, it takes 380 minutes to fill the pool. If she turns on only A and B, it takes 570 minutes, and if she turns on only B and C, it takes 760 minutes. If she turns on only A and

asked on September 22, 2013
74. math

express 7.179179... as a fraction

asked on August 20, 2018
75. chemistry

the reaction A+3B->2C+D is first order with respect to reactant A and second order with respect to reactant B if the concentration of A is doubled the concentration of B is halfed and the rate of the reaction would -------by a factor of --------

asked on March 3, 2016
76. physics

a parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density

asked on February 15, 2016
77. Algebra

A 12' ladder leans against a wall at 68 degree angle of elevation. Find the distance from the ladder's base to the wall.

asked on September 14, 2013
78. math

write the opposite, reciprocal, and absolute value of each number . A: -1/2 #: 4 C: 0

asked on September 9, 2011
79. stats

If a random sample of size n = 65 is drawn, find ¦Ìx, ¦Ò x and P(24 ¡Ü x ¡Ü 26). (Round ¦Ò x to two decimal places and the probability to four decimal places.) ¦Ìx = Correct: Your answer is correct.

asked on March 3, 2014
80. Algebra

A sales force has 10 men and 10 women. A production unit of 7 people is set up at random. What is the probality that it will consist of 3 men and 4 women

asked on September 14, 2013
81. History

I live in The United Kingdom. And we do not do grades we do Year. I am in Year 8 in United Kingdom. What is that in the United States? No it is an essay. I have been completing it because it is due for tomorrow. If you can please read it and make

asked on March 4, 2010
82. Financial Management

The management of cooper Equipment is planning to purchase a new milling machine that will cost 160,000 installed.The old machine has been fully depreciated but can be sold for 15,000. The new machine will be depreciated on a straight-line basis over its

asked on March 15, 2008
83. Statistics

Suppose X1;X2;...;X5 is a random sample from a n(0; variance) distribution. define U = X1+X2+X3+X4; V = (X2)^2+(X3)^2+(X4)^2+(X5)^2 and W = U/sqrtV. (a) Name the distribution of U/4 and V/(variance) and give the values of their parameters. (b) (i) Compute

asked on August 10, 2006
84. Chemistry

Ethanol has a density of 0.789 g/ml what volume of ethanol in litres would have a mass of 500g

asked on September 30, 2019
85. physics

how many electrons drift past a point on for 10 minutes current is 0.2 A.the charge on one electrons 1.6*10^-1

asked on March 2, 2016
86. math

A rancher wishes to use 86 ft of fencing to enclose a rectangular paddock and subdivide the region into three smaller areas. If the total enclosed area is 225 ft2, find the dimensions of the enclosed region.

asked on November 4, 2013
87. maths

A straight highway leads to the foot of a tower of height 50m. From the top of the tower, the angles of depression of two cars standing on the highway are 30 degree and 60 degree. What is the distance between the two cars and how far is each car from the

asked on October 17, 2013
88. Pre Algebra

A wooden railing is 82 feet long. It is to be divided into 4 pieces. Three pieces will be the same length, and the fourth piece will be 2 feet longer than each of the other three. Find the length of each piece.

asked on February 18, 2013
89. PHYSIC

1)What must be the orbital speed of a satellite in a circular orbit 740 above the surface of the earth? 2)What is the period of revolution of a satellite with mass that orbits the earth in a circular path of radius 8000 (about 1630 above the surface of the

asked on November 8, 2011
90. math

write the opposite, reciprocal, and absolute value of each number . A: -1/2 #: 4 C: 0

asked on September 9, 2011
91. History

Can someone please proof read my essay! I am running out of time Please! edit,spell check,grammar please What was the impact of the Industrial Revolution The Industrial Revolution was a period from the eighteenth to the nineteenth century where major

asked on March 4, 2010
92. History

By the way. The sentences seem long because your box is not long enough. Thesis:If you do not know the impact of the Industrial revolution, you will not understand anything in this essay. This topic is very good to study because you know about the

asked on March 4, 2010
93. Physical Education

The smooth and effective working together of your muscles and bones is what? Some call it muscle tone.

asked on November 28, 2006
94. Statistics

A normal population has an expected value of 60 and a variance of 30. Use the central limit theorem to determine what the sample size should be such that the mean has a probability of 90% to fall between the values 58 and 62. One concept of the Central

asked on August 10, 2006
95. physics

consider a series R-C circuit consisting of a 30 ohm resistor and 20*10^-6F capacitor connected to a 100V,50Hz power supply.find the magnitude of the current and the angle by which the current leads the voltage.

asked on April 4, 2016
96. physics really stuck

A sprinter starts from rest and accelerates for 5s. He then travels at a constant velocity for 10s. Finally he slows down to a stop in 5s. Draw a distance time graph to represent his motion.

asked on September 17, 2014
97. Algebra

Find the equation of the circle having the given center and radius. center (-5,1), radius 6 squared.

asked on September 14, 2013
98. math

convert the numeral to a numeral in base 10

asked on May 9, 2013
99. Criminology

How does rational choice theory work when someone is commiting a crime

asked on July 21, 2012
100. Algebra

Students in an English class took a final exam. They took equivalent forms of the exam at monthly intervals thereafter. The average score S(t), in percent, after t months was found to be given by . a) What was the average score when they initially took the

asked on February 1, 2012

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