# Rick

Popular questions and responses by Rick
1. ## Maths

An aeroplane is flying horizontally directly towards the city at an altitude of 400 metres. At a given time the pilot views the city lights of Melbourne at an angle of depression of 1.5 degrees. Two minutes later the angle of depression of the city lights

2. ## Chemistry

What volume of 0.716M KBr solution is needed to provide 10.5g of kBr?

3. ## Algebra

The Oliver Company plans to market a new product. Based on its market studies, Oliver estimates that it can sell up to 4,500 units in 2005. The selling price will be \$2 per unit. Variable costs are estimated to be 20% of total revenue. Fixed costs are

4. ## english 1

What is one way that “The Maori: Genealogies and Origins in New Zealand” contrasts with “The Raven and the First Men: The Beginnings of the Haida”?

5. ## Physics

A 1kg pigeon sits on the middle of a clothesline whose supports are 10m apart. The clothesline sags by 1 meter. If the weight of the clothesline is negligible, find the tension in it.

6. ## physics

A piece of copper wire has a resistance per unit length of 6.45*10-3 /m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.140 m. The ends of the wire are connected to a 12.0 V battery. Find the magnetic field strength at the

7. ## psychology

Much research is being conducted on repairing faulty sensory organs through devices such as personal guidance systems and eyeglasses, among others. Do you think that researchers should attempt to improve normal sensory capabilities beyond their

8. ## trig

please simplify sin (7pi/6 -x) + cos (2pi +x)

9. ## Physics

A boy with a mass of 40kg is seated a distance of 3.0m from the fulcrum of a seesaw. a. Calculate the load force exerted by the boy (Hint: What force is pulling him down?) b. Calculate the torque exerted by the boy. c. If his sister with a mass of 24 kg

10. ## Math

Question: Name a fraction between 1/4 and 5/16

11. ## Math

Find the length of the curve r(t)=sqrt(2)ti + e^tj + e^-tk, 0

12. ## physics

A 3Kg projectile is fired straight upward from earth's surface with a speed that is one-fourth the escape speed. Neglecting air resistance. a) What is the Kinetic energy of this projectile when it is launched? b) what is the gravitational potential energy

13. ## math

The average middle-distance runner at a local high school runs the mile in 4.5 minutes, with a standard deviation of 0.3 minute. The percentage of a runners that will run the mile in less than 4 minutes is %.

14. ## Busniness Finance

I am having some difficulties with week four lab. The explanation for problem skips a step and I do not know how to get the answer. (Weighted average cost of capital). As a member of the Finance Department of Ranch Manufacturing, your supervisor has asked

15. ## trig

If cos A =1/3 with A in QIV find cscA/2

16. ## Physics

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?

17. ## Physics Help..

The cable of an elevator of mass M = 1900 kg snaps when the elevator is at rest at one of the floors of a skyscraper. At this point the elevator is a distance d = 10.6 m above a cushioning spring whose spring constant is k = 8500 N/m. A safety device

18. ## Algebra

Find a linear equation whose graph is the straight line with the given property. HINT [See Example 2.] Through (2, −3) and (1, 1) Which formula do I use? y2-y1/x2-x1 or y-y1=m(x-x1)[

19. ## Chemistry(URGENT!)

determine whether the following salts will form acidic, neutral or basic solutions in water. Na2HPO4 CaNO2 NH4CH3COO Al2SO4 NaF Please, i need the answer to this question within 2 hours of when i post this!

20. ## Physics

A force vector F of magnitude 12N is applied to a FedEx box of mass m2=1kg. The force is directed up a plane tilted by theta=37 degrees. The box is connected by a cord to a UPS box of mass m1=3kg on the floor. The floor, plane, and pulley are frictionless,

21. ## physics

An electron and a positron each have a mass of 9.11*10^-31 kg. They collide and both vanish, with only electromagnetic radiation appearing after the collision. If each particle is moving at a speed of 0.55c relative to the laboratory before the collision,

22. ## trig

Use half-angle formulas to find the exact value for the following cot 75 degrees

23. ## trig

If sin = 4/5 with A in QII, and sin B = -3/5 with B in QIV find cos(A-B)

24. ## physics

The coil of a generator has a radius of 0.12 m. When this coil is unwound, the wire from which it is made has a length of 5.5 m. The magnetic field of the generator is 0.10 T, and the coil rotates at an angular speed of 25 rad/s. What is the peak emf of

25. ## Pseudocode programming

I need a currency conversion application. It does not have to be written in an actual programming language, just the pseudocode as well as the elements listed below. Complete requirements analysis Design Verification Validation and test documentation The

26. ## Math

How can I calculate the exact value of cos(1/2alpha) if alpha=arcsin1/3.

27. ## math

Is 499.79 million = 499,790,000? Is 15,099 million = 15,099,000,000?

28. ## Maths

The training of a football team involves running up and down a sandhill 25 times. If the hill is 30 m high and inclined at an angle of 35 degrees to the horizontal, how far does the team run during the training? Answer to the nearest 0.1 km.

29. ## geometry

The degree measures of the angles of triangle ABC are represented by 2x+8,x-8 and 2x-20,state the measure of each angle

30. ## physics

A ball is thrown 107 m upward and then falls back to earth. Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s

31. ## Algebra

A goldsmith has two gold alloys. The first alloy is 20% gold; the second alloy is 60% gold. How many grams of each should be mixed to produce 40 grams of an alloy that is 30% gold? amount of 20% gold_____g Amount of 60% gold_____g

32. ## chemistry

which metal react most vigorously? metals aluminum, copper, magnesium, lead, tin, zinc 1. which metal will react most quickly? 2. which will take the longest time to react? 3. which will react most vigorously and least vigorously? 4. list metals from order

Need help to explain to my daughter: A horsepower is the power needed to lift 33,000 pounds 1 foot in 1 minute. It is equivalent to 746 watts. Express 525 watts as a portion of a horsepower both as a fraction and a decimal rounded to the nearest

34. ## math

Gemma has to complete her chores for the week. She must finish 10 hours of chores to receive her allowance. She can work on landscaping for 2 to 8 hours. She can also do laundry for 4 to 6 hours. Determine the graph that correctly represents this system of

36. ## chem

what volume of 1M NaOH is needed for the reaction with 1L of 1M HCl?

37. ## math

Solve the following polynomial inequalities. a) 4x - 5 ≤ 2(x - 7)

38. ## Pre-Cal

This exercise is based on the following table, which lists interest rates on long-term investments (based on 10-year government bonds) in several countries in 2008. Assuming that you invest \$12,000 in the Japan(1.5%), how long (to the nearest year) must

39. ## trig

If theta is an angle in standard position, state in what quadrants its terminal side can lie if theta is equal to -415 degrees?

40. ## College Algebre

Here is the math problem: The height of an object in free fall, or otherwise thrown into the air near the earth's surface, with initial vertical velocity v0 in feet per seconds, and from the initial height h0 in feet, at any given time t in seconds is

41. ## Chemistry

If you place a white tablet in 10 ml of water that is 21 degrees celsius, the tablet bubbles. When it is done the water is now 20 degrees celsius. What reaction occured?

42. ## Physics

The head of a golf club exerts a force of 350N on a golf ball for 0.3m. The golf ball has a mass of 85g. What speed should the golf ball have when it leaves the club head?

43. ## math

At noon, ship A is 50 nautical miles due west of ship B. Ship A is sailing west at 16 knots and ship B is sailing north at 21 knots. How fast (in knots) is the distance between the ships changing at 3 PM

44. ## physics

A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 320 km/h in a semicircular arc with a radius of 190 m. 1.) Determine the tangential acceleration of the car when it is halfway through the turn, assuming constant

45. ## statistics

14. Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking—even if they are not exposed to the usual

46. ## Physics

Vector A has a magnitude 12m and is angled at 60 degrees counterclockwise from the positive direction of the x axis of an xy coord. system. Also. Vector B = (12m)i + (8m)j on that same coord system. Rotate the system counterclockwise about the origin by 20

47. ## math

Can someone show me the steps necessary to simplify the expression by combining like terms? 1/4(6b+2) – 2/3(3b-2)

48. ## geometry

okay, if I have a square, and know the square footage-how can I find the middle of that square? I can't figure this out for the life of me.

49. ## ushistory

the assembly line production of henry ford's model t automobile resulted in what? my answer: it resulted in development of a large interantional marekt for american automobiles but im not sure if it was a sharp decrese in railroad passenger traffic or a

50. ## history

What did George Washington and Thomas Jefferson contribute in establishing a stable government after the adoption of the Constitution? For Washington I have: 1) He became first president for 8 years 2) Proclamation of Neutrality protected Americans from

51. ## trig

Prove the identity sin(3 pi /2 + x) + sin(3pi/2 -x) = -2cosx

52. ## trig

Graph the following from X = 0 to x = 2 pi 2cos 6x cos4x + 2 sin 6x sin 4x

53. ## physics

A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing. What is the total charge (in coulombs) that this battery can provide? Determine the maximum

54. ## physics

An electron and a proton are initially very far apart (effectively an infinite distance apart). They are then brought together to form a hydrogen atom, in which the electron orbits the proton at an average distance of 5.11 10-11m. What is EPEfinal -

55. ## algebra

find the average weight in pounds of a type of bird of your choice. Use the rational exponent equation L = 2.43 * W^0.3326 to estimate the wingspan L in feet of the bird that weighs W pounds show the average weight. How do I show the calculations necessary

56. ## Math permutations

pi=(245)(1354)(125) 1) Write as a product of disjoint cycles. Ans: (14)(253) Is this correct? 2) Solve : pi^2, pi^5,pi^(-1) 3) What's the order of pi? and why?

57. ## history

after world war II why did russia's stance toward europe become dominant and the united states' stance became one that they felt that they should be an influence in europe?

58. ## science

Labels for Illustration of the Life Cycle of an Average Star You are making an illustration of the life cycle of an average star and the life cycle of a massive star as part of a computer animation. Drag each item to indicate whether it is a label for an

59. ## math

A rectangular box has a length of 12 inches and a width of 4 inches. The length of the three-dimensional diagonal of the box is 14 inches. What is the height of the box? I would like to see how to get this answer so I would like a formula or a equation for

60. ## English

Should there be a comma? "I am tall and you are short." (A) Yes, after "you." (B) Yes, after "tall." **** (C) Yes, after "I." (D) No comma is needed.

61. ## Algebra

Cynthia wants to buy a rug for a room that is 25 ft wide and 34 ft long. She wants to leave a uniform strip of floor around the rug. She can afford to buy 630 square feet of carpeting. What dimensions should the rug have?

62. ## Maths

Two ships sail from port P. One sails 14km due south while the other sails 17km on a bearing of 120 degrees. Calculate to one decimal place the distance between the ships.

63. ## Maths

A square is transformed into a recatangle of perimeter 30 cm, by increasing one side by 3 cm and reducing the adjacent side by 2 cm. Find the length of the square's side.

64. ## Maths

Find a if a is between 0 degrees and 180 degrees, and: a. Sin a = cos a b. sin^2 = 3/4 c. tan^2 = 1/3 I have no clue on where to start any help would be much appreciated.

65. ## Maths

The median for a set of 10 numbers is 10. An even number is added, and the median is now 11 and the range is now 4. What number was added?

66. ## Mathematics question

Three pieces of fruit have an average weight of m grams. After another piece of fruit is added, the average weight doubles. Find the weight of the extra piece of fruit in terms of m.

67. ## Math

How do I convert improper fractions into proper fractions?

68. ## Physics

a 50 kg block is being pulled up a 37 degree incline with a force of 450 N applied parallel to the incline. The block moves at a constant velocity. What is the kinetic friction? power if the velocity is 1.5 m/s? acceleration if the applied force increases

69. ## Math

Ms. Jones is baking a cake for her students. She needs 2/3 cup of brown sugar to make the cake. Right now, she has 3/4 cup of brown sugar. Does she have enough to make the cake?

70. ## Physics

What is the ratio of the volumes for two black holes whose masses are 20 and 10 times the mass of the Sun, respectively? Assume the ’event horizon’ deﬁnes the edge of each black hole’s ’volume’

71. ## physics

A box slides down a frictionless 35 degree incline. Determine its acceleration. If the incline is 10.0 m long and the box starts from rest, how much time does it take to get to the bottom?

72. ## Physics

You must arrange three mystical stones in a line. They have masses 10.0 kg, 7.00 kg,and 3.00 kg. You place the 7.00 kg and 3.00 kg stones 5.00 m apart. Where do you need to place the 10.0 kg stone for the center of mass of the three stones to be 2.25 m

73. ## Physics

A wire with cross sectional area 1.00 cm2 stretches 0.500% of its length when it is stretched with a tension of 20.0 N. What is the Young's modulus of this wire?

74. ## Physics

You push a block of mass m up a plane inclined at angle θ at constant velocity v with a force F parallel to the inclined plane. The coeﬃcient of kinetic friction between the block and the plane is µk. Which is the correct equation for F? (g =

75. ## health

Which of the following is NOT a type of muscle? A. Skeletal B. Long C. Smooth D. Cardiac

76. ## math

How many gallons of water are in a tank with a diameter of 40' and 12' tall ?

77. ## Math

number of students in a class = 36 number playing cricket = 16 number playing football = 25 number playing both cricket and football = x write an equation for x how many students play both football and cricket

78. ## Algebra

(-5,3), (4,-5). Slope intercept form

79. ## Algebra

Y= 1/2x -5, (-3,-1)

80. ## Math

Y= -3x+2 (2,3)

81. ## math

4. A tree stands vertically on top of a hill whose angle of inclination is 30°. The top and base of the tree are 4√3 and 4 meters, respectively, from a point P at the foot of the hill. What is the angle of subtended by the tree at point P?

82. ## math

-4x-2 solve each inequality

83. ## math

a store manager is accipting applications for part time workers. He can hire no more than 14 people. So far he has hired 9 people. Write and solve an inequality to determine how many more people the manager can hire

-5+b

85. ## algebra

solve inequality and graph a-1/4 > 5 3/4

86. ## algebra

I need an example how to graph for an inequality solution. eq. 5

87. ## algebra

graph inequality k

88. ## algebra

Draw a rectangle to show that 5 (x + 2 ) and 5x + 10 are equivalent ?

89. ## math

Pat worked 43 hours and received \$7.25 per hour for regular pay and time-and-a-half for all hours over 40 hours. What were her weekly earnings?

90. ## functions

The estimated value of the Mona Lisa was about \$100 million in 1960. By the year 2000 its value had increased to approximately \$600 million. Write a straight line appreciation equation for the painting where y is the approximate value in millions of

91. ## Maths

A movie theatre seats 200 people. For any particular show, the amount of money, m, the theatre makes is a function of the number of people, n, in attendance. If a ticket costs \$12 and the cost to the theatre to run one show is \$120, state the domain and

92. ## math

a model rocket is projected straight upward from the ground level. It is fired with an initial velocity of 192 ft/s. How high is the rocket after 10 seconds? When is the rocket at a height of 432 feet? What is the maximum height of the rocket? When will

93. ## math

a model rocket is projected straight upward from the ground level. It is fired with an initial velocity of 192 ft/s. How high is the rocket after 10 seconds?

94. ## algebra

(x^-3+y^-1)/x^-2

95. ## algebra

x^2-9y^2/xy/1/y-3/x

96. ## geometry

Two sides of a triangle are 22 and 34.The length of the third side must be greater than ____ and less than ____.

97. ## statistics

A couple considering a mortgage of \$100,000 have a choice of loans. One loan is an 8% loan for 20 years, and the other loan is at 8% for 30 years. Find the amount of interest that the couple can save by choosing the 20-year loan.

98. ## second degree equation word problem

A theater that is rectangular in shape seats 720 people.The number of rows needed to seat the people would be 4 less if each row held 6 more people.How many people would then be in each row?

99. ## Calculus

400 feet of fencing is to be used to enclose four adjacent pieces of land. What dimensions will produce the largest area?