# Brian

Popular questions and responses by Brian
1. ## Science

Please help A Brick is resting on smooth wooden board that s at a 30 angle, What is one way to overoome the state tuition that is holding the brick in plece? (i pot) Raise the board to her angle press down on the brick in a direction that perpendicular to

2. ## Science

which statement about friction is true? A. Static friction and kinetic friction in a system always act in the same direction as each other and in the same direction as the applied force. B. Static friction and kinetic friction in a system always act in

3. ## calculus

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at the rate of 10 cubic feet per minute. The diameter of the base of the cone is approx­ imately three times the altitude. At what rate is the height of the pile changing

4. ## Math

Postal regulations specify that a parcel sent by priority mail may have a combined length and girth of no more than 96 in. Find the dimensions of a rectangular package that has a square cross section and the largest volume that may be sent via priority

5. ## Chemistry

Which element listed should have chemical properties similar to fluorine (F) A.Li B.Si C.Br D.Ne Br, along with F, a halogen (column 7 of the periodic table) Look at the periodic table. The columns are called groups. Elements in the same group have similar

6. ## statistics

A college professor decides to run for Congress in a district with 450,000 registered voters. In a survey she commissioned, 58% of the 4000 registered voters interviewed indicated that they plan to vote for her. The population of interest is the: A.

7. ## Drug Abuse and Addiction

I need research sources for drug abuse and addiction. Thank you. Check these sources -- http://www.nida.nih.gov/ http://teens.drugabuse.gov/ (Broken Link Removed) http://www.drugabusestatistics.samhsa.gov/

8. ## Math

One model of Earth's population growth is , where t is measured in years since 1990, and P is measured in billions of people. Which of the following statements are true?

9. ## algebra

Write an equation that expresses the following relationship. P varies directly with the cube of D and inversely with U. In your equation, use K as the constant of proportionality.

10. ## Bus. Math 123

Problem: Invoice-Nov. 27. Date goods recvd. ? Terms- 2/10 EOM. Last day of discount- ? Final day bill is due ? Complete above.

11. ## math/statistics

In the Numbers Game, a state lottery, four numbers are drawn with replacement from an urn containing balls numbered 0-9, inclusive. Find the probability that a ticket holder has the indicated winning ticket. The first three digits in exact order.

12. ## Chem

what kind of intermolec forces are in NH4Cl i thought it was london dispersion, dipole dipole, and hydrogen bonding and nottttt ionic. what am i doing wrong?

13. ## Calc I

if f(t)=sqrt(4t+1) find f''(2) I got the first derivative to be: 1/2(4t-1)^-1/2 * 4t^3 and i'm trying to figure out if i need the product rule again to find the second derivative -1t^3(4t-1)^-3/2 * 4t^3 The answer if -4/27 and I'm not sure how to get that

14. ## programming

create the logic for a program that calculates and displays the amount of money you would have if you invested \$5000 at 2 percent simple interest for one year. create a separate method to do the calculation and return the result to be displayed.

15. ## Chemistry

What is the C-C-H bond angle in the molecule H2CCO?

16. ## algebra

translate into algebraic expression 24 more than twice Greg's age

17. ## math Question

Find an equation that models a hyperbolic lens with a=12 inches and foci that are 30 inches apart. assume that the center of the hyperbola is the origin and the transverse axis is vertical.

18. ## health

Identify at least five indicators of project failure that manifest themselves in this case study. Are these right ? these are a few i have came up with: organized inertia lack of clarity of pupose lack of landor project status report insufficient

19. ## Calculus

All edges of a cube are expanding at the rate of 3 centimeters per second. How fast is the volume chang­ ing when each edge is (a) 1 centimeter and (b) 10 centimeters?

20. ## Chemistry

How many ml of water must be added to 40.0 ml of 2.50 m koh to prepare a solution that is 0.212 m?

21. ## Calculus I, differentiation

The number, N, of people who have heard a rumor spread by mass media by time, t, is given by N(t)=a(1−e−kt). There are 6 million people in the population, who hear the rumor eventually. If 5% of them heard it on the first day, find the percentage of

22. ## Math

the thirteenth term of an arythmeticprogression is 27. given that the seventh term equals to three times the second term, find: the first term nd the common difference of the progression

23. ## Calculus II

A cable that weighs 1.5 lb/ft is used to lift 700 lb of coal up a mineshaft that is 400 ft deep. Find the work done.

24. ## MATH

A photograph has been enlarged to three times its previous size. By what percentage has the size of the photograph increased?

25. ## Chemistry

What is the wavelength of an electron traveling at 7.59% of the speed of light?

26. ## AP CHEM

Complete and balance the reaction Al(s) + Pb2+(aq) ! using the smallest possible integers. I got: 2Al(s) + 3Pb2 ==> Al2Pb3 Calculate the standard free energy. Faraday’s constant is 96485 J V · mol Answer in units of kJ/mol. I know the formula is -nFE

27. ## Math

The length of a rectangular board is 10 cm longer than its width. The width of the board is 26 cm. the board is cut into 9 equal pieces. What is the area of each piece? What are the possible dimensions of each piece?

28. ## Chemistry (Electrochemistry)

The standard potential for the following galvanic cell is 1.72V : Be(s)|Be2+(aq)||Pb2+(aq)|Pb(s) The standard reduction potential for the Pb2+/Pb half-cell: E = -.13V Calculate the standard reduction potential for the Be2+/Be half-cell. What I know: Be is

29. ## physics

5. A bomber is flying at a height of 9 km at 800 km/h. How far in front of the target should he drop his bombs? show formulas*

30. ## Statistics

A random sample of forty-eight 200 meter swims has a mean of 3:12 minutes and a standard deviation of .09 minute. Construct a 95% confidence interval for the population mean time. I know u: 3.12, sx: .09, n:48, c:.95 What is the formula I use to find the

31. ## Precalculus

Every point in the plane has exactly two polar coordinates. A)The statement is true because every point in the plane has a unique polar representation. B)The statement is false because left parenthesis r comma theta right parenthesis equals left

32. ## Accounting

It is stand accounting procedures, or GAAP, to make an adjusting entry to remove the current year’s principle from the long-term liabilities. This entry reduces the long-term liabilities and increases the current liabilities. You are the bookkeeper for

33. ## English

Which literary term is used in the following sentence: polite reciprocal curiosity out of a wan, charming, discontented face. It occurred to me that I had seen her, or a picture of her, somewhere before.

34. ## Physics

How does the electric potential energy (EPE) between two point charges depend upon their separation s? a. EPE ∝ 1/s b. EPE ∝ s c. EPE ∝ 1/s2 d. EPE ∝ s2 I want to say it's a. since it's part of the formula UE = kq1q2/s but I'm not too sure if that

35. ## Pre-Calculus

How do I solve the equation: 3 = 2.1 sin[(pi/6)t - 5pi/6] + 3.2

36. ## Chemistry

6Li(s) + N2(g) 2Li3N(s) a) What mass of lithium is required to produce 0.575 g of Li3N in the balanced reaction? b) What mass of nitrogen is required for the reaction? ------------------------------------------- I tried dimensional analysis in a couple

37. ## Chemistry, HELP!!

a) If the volume of a flask is 165 mL and the mass of the vapor in the flask is 0.2136 grams, what is the density of vapor in the flask? b)If the temperature of the vapor is 25 degrees Celsius, what is the molecular weight of the vapor? (Assume the gas

38. ## physics

A rocket is used to place a satellite in orbit about a planet. The velocity of the satellite is 534 m/s and the radius of orbit is 1.21×108 m. What is the mass of planet?

39. ## Chemistry

A compound containing only carbon, hydrogen and oxygen is subjected to elemental analysis. Upon complete combustion, a .1804g sample of the compound produced .3051g of CO2 and .1249g of H2O. What is the empirical formula of the compound?

40. ## Physics

Visible light is incident perpendicularly on a diffraction grating of 200 rulings/mm. What are the (a) longest, (b) second longest, and (c) third longest wavelengths that can be associated with an intensity maximum at theta=30 degrees?

41. ## calculus

A projectile is launched from a platform 20 feet high with an initial velocity of 72 feet per second, The height h of the projectile at t seconds after launch is given by h = –16t2 + 72t + 20 feet. (a) How many seconds after launch does the projectile

42. ## Math

In a game, 5 points are awarded for each game and 2 points are deducted for each game lost,Kyler attempted 15 games,if he got 68 points,how many gamesvdid he lose?

43. ## History

Which adjective best describes Ming China’s position toward European trade? a.diplomatic b.equivalent c.inviting d.restrictive

44. ## Math

On a ruler that measures both metric and English units, we see that 1m=39.37 in. This implies that 2m = 78.74 in. Use this information to write an equation to convert x in. to y meters.

45. ## Physics

Which of the following is correct for the two coherent light waves to produce zero light? The light waves should travel in perpendicular directions. The light waves are in phase with each other. The light waves are out of phase with each other. The light

46. ## math

Use the formula t = (0.25) s1/2 to find the time t in seconds it will take a stone to drop a distance s of 200 feet. Round your answer to the nearest tenth of a second.

47. ## science

a person weighs 815 N on the earth, what is the persons weight on the moon?

48. ## Physics

A 0.075 kg ball in a kinetic sculpture moves at a constant speed along a motorized conveyor belt. The ball rises 1.32 m above the ground. A constant frictional force of 0.350 N acts in the direction opposite the conveyor belt's motion. What is the net work

49. ## health

Case Study â€“ Memorial Health System CPOE Implementation Identify at least five indicators of project failure that manifest themselves in this case study. 2. For each of those indicators, describe what you might have done differently to eliminate or

50. ## MATH

The triangular numbers are the numbers 1, 3, 6, 10, 15, . . .; the square numbers are the numbers 1, 4, 9, 16, 25, . . . The pentagonal numbers 1, 5, 12, 22, 35, . . .. The geometrical language is justified by the following diagrams: a. What are the first

51. ## Trigonometry

How would you find the solutions to this problem? (cosx)(cscx)=2cosx

A college professor decides to run for Congress in a district with 450,000 registered voters. In a survey she commissioned, 58% of the 4000 registered voters interviewed indicated that they plan to vote for her. The population of interest is the: A.

53. ## health

Which one of the following groups has the highest incidence of diabetes in the U. S.? Hispanic Americans Native Americans Asian Americans White Americans I think it's white americans, but i'm not sure

54. ## probability

1. Busy people arrive at the park according to a Poisson process with rate λ1=3/hour and stay in the park for exactly 1/6 of an hour. Relaxed people arrive at the park according to a Poisson process with rate λ2=2/hour and stay in the park for exactly

55. ## math/statistics

In a survey of 400 individual investors regarding subscriptions to the New York Times (NYT), Wall Street Journal (WSJ), and USA Today (UST), the following data were obtained. 120 subscribe to the NYT. 146 subscribe to the WSJ. 68 subscribe to the UST. 36

56. ## math

A financier plans to invest up to \$500,000 in two projects. Project A yields a return of 8% on the investment of x dollars, whereas Project B yields a return of 13% on the investment of y dollars. Because the investment in Project B is riskier than the

57. ## math

Sam has twice as many books as Jim. If Sam gives 12 books to Jim, they will have the same number of books. How many books to they have altogether?

58. ## stats

If a student answers 40 multiple choice questions, each with four possible answers, by guessing randomly, the probability that she answers at least 15 correctly

59. ## Calculus

A spherical balloon is inflated with gas at the rate of 20 cubic feet per minute. How fast is the radius of the balloon increasing at the instant the radius is (a) 1 foot and (b) 2 feet?

60. ## physical science

A golfer on a level fairway hits a ball at an angle of 38° to the horizontal that travels 85 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 85 yd. At what

61. ## Calc I

Find an equation of the tangent to the curve at the given point. y=4(sinx)^2 point: pi/6,1) So I took the derivative of the original function to get: y' = 8cosx*sinx I then chose a point to plug in to find a point for the slope. i picked pi/6 because i

62. ## statistics

A simple random sample of students is selected, and the students are asked how much time they spent preparing for a test. The times (in hours) are as follows: 1.3 7.2 4.2 12.5 6.6 2.5 5.5 Based on these results, a confidence interval for the population

63. ## Chemistry, empirical formula

Determine the empirical formula for the following compounds with these compositions (by mass): a) Cr 47.7% F 52.3% b) Na 42.1% P 18.9% O 39.0%

64. ## Physics

Dry air will break down if the electric field exceeds about 3.0 × 106 V/m. What amount of charge can be placed on a capacitor if the area of each plate is 6.7 cm2?

65. ## Physics

Betty weighs 427 N and she is sitting on a playground swing seat that hangs 0.22 m above the ground. Tom pulls the swing back and releases it when the seat is 0.88 m above the ground. The acceleration of gravity is 9.8 m/s2. How fast is Betty moving when

66. ## Physics

We want to rotate the direction of polarization of a beam of polarized light through 90 degrees by sending the beam through one or more polarizing sheets.(a) What is the mini-mum number of sheets required? (b) What is the minimum number of sheets required

67. ## Physics

Some neodymiun-glass lasers can provide 100 TW of power in 1.0 ns pulses at a wavelength of 0.26 um. How much energy is contained in a single pulse?

68. ## geometry

Given --->VY bisects ZY bisects

69. ## English

this crime is holy-------what kind of literary device is this?

70. ## physics

a horizontal force of 290N is applied to a stationary wooden box in one direction, and a 800N horizontal force is applied in the opposite direction. What additional force is needed for the box to remain stationary?

71. ## geometry

f(x)=2x²-Bx+4 and f(3)=13, what is the value of B?

72. ## Chemistry

Which one of the following pairs of reactants would react together in a Lewis Acid/Lewis Base reaction? a. KOH and HNO2 b. NaOH and HCl c. CH3COOH and HF d. Ag+ and NH3 e. HClO and NH3

Charges of −4q are fixed to diagonally opposite corners of a square. A charge of + 5q is fixed to one of the remaining corners, and a charge of + 3q is fixed to the last corner. Assuming that ten electric field lines emerge from the + 5q charge, sketch

74. ## Math

How can the faces of two cubes be numbered so that when they are rolled, the resulting sum is a number 1 to 12 inclusive and each sum has the same probability?

75. ## Physics

A certain force gives mass m1 an acceleration of 10.0 m/s2 and mass m2 an acceleration of 4.0 m/s2. What acceleration would the force give to an object with a mass of (m2-m1)?

76. ## physics

A 24- kg monkey climbs up a massless rope that runs over a frictionless tree limb and back down to a 35- kg package on the ground. What is the magnitude of the least acceleration the monkey must have if it is to lift the package off the ground?

77. ## physics

A certain force gives mass m1 an acceleration of 10.0 m/s2 and mass m2 an acceleration of 4.0 m/s2. What acceleration would the force give to an object with a mass of (m2-m1)?

78. ## math

if three darts are thrown at the dart board and no darts hits a line what score is possible?

79. ## Math (Finance)

The analysis process for preparing adjusting entries involves two basic steps. Identify the two steps and explain why both are necessary.

80. ## physics

During a rockslide, a 520kg rock slides from rest down a hillside that is 500m long and 300m high. The coefficient of kinetic energy between the rock and the hill surface is .25. a) If the GPE energy U of the rock –Earth system is zero at the bottom of

81. ## Mathematics

In a shool,7/10 of the pupils like mathematics.Half of those pupils who like mathematics are girls.If there areither 240 pupIlsley altogether in the school,how many girls like mathematics.

82. ## Biology

The offspring of a cross between a plant with purple flowers and a plant with white flowers are 23 plants with purple flowers and 26 plants with white flowers. What are the genotypes of the parent plants

83. ## Science

A bullet of mass 20 g traveling Horizontally at 100m/s,embeds itself in the centre of a block of wood mass 1kg which is suspended by light vertical string 1metre length.calculate the maximum inclination of the string to vertical assuming g=9•8m/s

84. ## earth science

what are risks associated with human-caused extinction?

85. ## probability

When you enter your bank, you find that there are only two tellers, both busy serving other customers, and that there are no other customers in line. Assume that the service times for you and for each of the customers being served are independent

86. ## probability

Consider a Poisson arrival process with rate λ per hour. To simplify notation, we let a=P(0,1), b=P(1,1), and c=P(2,1), where P(k,1) is the probability of exactly k arrivals over an hour-long time interval. What is the probability that we will have “at

87. ## Calculus

assuming the population of the earth changes at a rate proportional to the current population further, it is estimated that at time t=0, the earth's population was 600 million, at t=300, it's population was 2.8 billion. find an expression giving the

88. ## Science - chemistry

Write the complete ionic equation for the reaction of magnesium phosphate with lead (II) nitrate. Include which ions will be aqueous and which compound will precipitate. (Valences: Mg=+2, PO4=-3, Pb=+2, NO3=-1)

89. ## math/statistics

In a survey of 200 employees of a company regarding their 401(k) investments, the following data were obtained. 150 had investments in stock funds. 78 had investments in bond funds. 60 had investments in money market funds. 46 had investments in stock

90. ## Math

Place grouping symbols to make the equation true: 3x5-8+7-3/6=13

91. ## calclus

A fish is reeled in at a rate of 1 foot per second from a bridge 15 feet above the water. At what rate is the angle between the line and the water changing when 25 feet of line is out? (Assume the fish stays near the surface of the water.)

92. ## calculus

A point is moving along the graph of y = x2 so that dx/dt is 2 centimeters per minute. Find dy/dt when (a)x = 0 and (b)x = 3.

93. ## Geometry

Explain why knowing a combination of four pairs of equal sides or equal angles guarantees one of the congruence relationships.

94. ## Math- Geometry

Explain why knowing a combination of four pairs of equal sides or equal angles guarantees one of the congruence relationships.

95. ## Math

Prove that an exterior angle of a triangle is equal to the sum of the non adjacent interior angles of that triangle. Use the following variables in your proof. Exterior angle=w Interior adjacent angle= x Interior non adjacent angle1= y Interior non

96. ## Chemistry

Calculate the total amount of heat that must be added to convert 15.7g of ice at its melting point to steam at 100.0°C

97. ## chemistry

A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 4.00 atm C. 0.500atm

98. ## Physics

Two charged particles have equal mass and carry charges of 2 nC and 3 nC respectively. They enter a magnetic field of strength 2 mT at the same velocity. Assuming that both particles exit the field parallel to each other and perpendicular to the field,