# Daniel

Popular questions and responses by Daniel
1. ## Math

A cylindrical water tank is 70cm in diameter to begin with it is full of water a leak starts in the bottom so that it looses 10 litres every 1 hour how long will it take for the water level to fall by 20cm.

2. ## Math

A fuel oil tank is an upright cylinder, buried so that its circular top 12 feet beneath ground level. The tank has a radius of 6 feet and is 18 feet high, although the current oil level is only 13 feet deep. Calculate the work required to pump all of the

3. ## College Physics

A uniform horizontal rod of mass M and length l rotates with angular velocity w (omega) about a vertical axis through its center. Attached to each end of the rod is a small mass m. Determine the angular momentum of the system about the axis. Write you're

4. ## Physics

A rubber ball filled with air has a diameter of 25.0 cm and a mass of 0.540 kg. What force is requiered to hold the ball in equilibrium immediately below the surface of water in a swimming pool? Start equation out by using sumF = ma Answer is 74.9 N I just

5. ## mathematics

find the perimeter of a rectangular field which is 10m by 5m

6. ## social studies

institutions that promote national unity

7. ## physics

A convex mirror in an amusement park has a radius of curvature of 3.00m. A man stands in front of the mirror so that his image is half as tall as his actual height. At what distance must the man focus his eyes in order to see his image? I calculated the

8. ## math

given that 2x^2-kx+18 is a perfect square,find k and hence solve the equation 2x^2-kx+18=0

9. ## Math

The 3rd and 9th term of a g.p are 54 and 39,336 respectively.find the 6th term,sum of 4th term,sum of 4th and 7th term and product of 2nd and 5th term

10. ## Chemistry

Calculate the energy change associated with the transition of an electron from the n=2 shell to the n=5 shell in a Bohr hydrogen atom.

11. ## Pysics

Realizing that she often doesn't have her students' full attention during class, a professor devises an elaborate device on which to stand while she lectures. The pulley is placed so that the string makes a 45.0-degree angle with the beam. The beam is

12. ## Electrochemistry

Ag2CrO4(s) + 2e- 2Ag(s) + CrO42-(aq) A chemist wishes to determine the concentration of CrO42- electrochemically. A cell is constructed consisting of a saturated calomel electrode (SCE; which has a reduction potential of 0.242 V relative to the SHE) and a

13. ## physics

a spring of force constant 1500N/m is acted upon Hy a constant force of 75N .calculate the potential energy stored in the spring

14. ## calculus

-find the equation of the tangent line to the curve y=5xcosx at the point (pi,-5pi) -the equation of this tangent line can be written in the form y=mx+b where m= and b= -what is the answer to m and b?

15. ## mathematics

D is partly constant and partly varies with V=40,D=150 and when V=54,D=192 I) find the formula connecting V=54 D=192 ii) find D when V=73

16. ## English

As the headboy of your school write a speech on the send forth party of the principal of your school.

17. ## physics

A 2.44 kg object is subjected to three forces that give it an acceleration vector a = -(8.00 m/s2)i hat + (6.00 m/s2)j hat. If two of the three forces are vector F1 = (30.7 N)i hat + (17.0 N)j hat and vector F2 = -(12.0 N)i hat + (8.00 N)j hat, find the

18. ## math

Suppose the mean length of time that a caller is placed on hold when telephoning a customer service center is 23.8 seconds, with standard deviation 4.6 seconds. Find the probability that the mean length of time on hold in a sample of 1,200 calls will be

19. ## Algebra 2 A

A jet ski company charges a flat fee of \$26.00 plus \$3.25 per hour to rent a jet ski. Another company charges a fee of \$24.00 plus \$3.50 per hour to rent the same jet ski. Using a graphing calculator, find the number of hours for which the costs are the

20. ## Physics

A 821-kg car stopped at an intersection is rear-ended by a 1810-kg truck moving with a speed of 11.5 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of both vehicles after the

21. ## math

A tree casts a shadow of 28 feet. At the same time, a biologist who is 7 feet tall casts a shadow of 2 feet. How tall is the tree?

22. ## Physics

A liquid (density = 1.65 g/cm^3) flows through two horizontal sections of tubing. In the first section the cross-sectional area is 10.0 cm^2, the flow speed is 275 cm/s, and the pressure is 1.20 x 10^5 Pa. This tubing then rises 50 cm to the second

23. ## Math

How many positive 3-digit integers contain only odd digits?

24. ## solving two-step inequality

Translate the following inequality into written language. 5x-6

25. ## math

Look at the numbers below. 75, 74, 72, 69, 65 A: describe the pattern

26. ## Statistics

Hello. I would like to ask a college statistics question. Q. One hundred draws are made at random with replacement from the box [1,2,2,5]. The draws come out as follows:17 's, 54 's, 29 's. Fill in the blanks, using the options below; show work.

27. ## Chemistry

For the reaction of hydrazine (N2H4) in water, Kb is 3.0 10-6. H2NNH2(aq) + H2O(l)--> H2NNH3+(aq) + OH-(aq) Calculate the concentrations of all species and the pH of a 1.6 M solution of hydrazine in water. [OH-] = [H2NNH3+] = [H2NNH2] = [H+] = pH =

28. ## ellipses

If the major axis is vertical and has a length of 10 units,the minor axis has a length of 8 units,and the center C=(4,-2).Fill in the missing denominators for the equation and determine the distance from C to the foci (c).

29. ## Set Theory

Let the Universal Set, S, have 136 elements. A and B are subsets of S. Set A contains 34 elements and Set B contains 98 elements. If Sets A and B have 22 elements in common, how many elements are in A but not in B?

30. ## Math

A river flows at the speed of v from west to east. How should a man who is at a point A of the southern bank of the river, which is d meters away from the river, and wants to reach a point B on the northern bank of the river, which is 2d meters away from

31. ## physics

a projectile is thrown from the ground with an initial velocity of 20.0m/s at an angle of 40 degrees above the horizontal, find the maximum height,the time required to reach its maximum height,c) it velocity at the top of the trajectory.d) the range of the

32. ## Chemistry (Electrochemistry)

Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced

33. ## Chemistry

An EDTA solution is standardised against high-purity CaCO3 by dissolving 0.4835 g CaCO3 in HCl, adjusting the pH to 10 with ammoniacal buffer and titrated with an EDTA solution. If 35.18ml were required for the titration, what was the molarity of the EDTA

34. ## physics

In a water park, people walk up a ramp before diving into the water below. If they cover a horizontal distance of 100 meters before diving down 50 meters, what is the angle made by the ramp with the ground?

35. ## physics

A steel section of the Alaskan pipeline had a length of 65 m and a temperature of 22° C when it was installed. What is its change in length when the temperature drops to a frigid -37° C?

36. ## algebra

all two-digit numbers whose units digits is half the tens digit?

37. ## Chemistry

When 0.100 mol of CaCO3 (s) and 0.100 mol of CaO (s) are placed in an evacuated container with a volume of 10.0-L and heated to 385 K, PCO2 = 0.220 atm after equilibrium is established: CaCO3(s) ⇌ CaO (s) + CO 2 (g) An additional 0.300 atm of CO2 (g) is

38. ## arithmetic

The sum of the first 10th term of an a.p is 255,the sum of the first 20 term is 1010.find the next 2020 term of the progression

39. ## Physics

A cheetah running at 30 m/s is pursuing a zebra going in a straight line at 14 m/s. If the zebra has a 35 m head start, how much time does it take for the zebra to catch up? (Please show all work. I know the answer, but I need the step by step instruction

40. ## calculus

Anti Derivative of F''(x) = 4 + 6x + 24x^2, f(0) = 3, f(1)=10 Not sure how to find the value of the constant for F'(x).

41. ## math

Suppose a white dwarf star has a diameter of approximately 1.6692x10^4 km. Us the formula 4pie^2 to find the approximate surface area of the star

42. ## Science

What letter represents the nucleus of a cell?

43. ## math

In a school, 156 students passed geography or history. There were 75 students who passed in both subjects. If 9 more passed Geography than history, find how many were taking each subject

44. ## pre-algebra

the scale on a map is 1 cm: 7 km. if two cities are 15 cm apart on a map, what is the actual distance in the cities?

45. ## maths

a bicycle wheel has a diameter of 42 cm.how many revolutions will it make to cover a distance of 13.2km

46. ## age question

A man is 24 years when his son was born. Now he is three times as old as his son. Find the age of the son.

47. ## science help needed quick fools

how do the circulatory and endocrine systems work together to help maintain homeostasis

48. ## math last one help

sally drew a factor tree of a composite number and ended up with 4x4x5x5x3 as the prime factorization. explain what is wrong with this factorization 1. what is the correct prime factorization? 2. what is the composite number that was factored?

49. ## physics

a train's stopping distance even when full emergency brakes are engaged is 1.3 km. If the train was travelling at an initial velocity of 90km/h(forward), determine its acceleration under full emergency braking

50. ## Calculus

An animal population is increasing at a rate of 150+20t animals per year. By how much does the animal population increase between year 5 and year 8?

51. ## physics (Right Hand Rule Question)

A proton traveling due east in a region that contains only a magnetic field experiences a vertically upward force away from the surface of the earth. What is the direction of the magnetic field? a)North b)East c)South d)West e)Down I know I need to use the

52. ## Math

How many liters of water should be added to 20 liters of 40% solution of acid to obtain 30% solution?

53. ## Math

What is 2x + 6y = 12? I need to find y, the slope, and the y-intercept. Please help!

54. ## chemistry

Which of the following mixtures will result in the formation of a buffer solution when dissolved in 1.00 L of water? i) 0.50 mol HClO2 and 0.25 mol HCl. ii) 0.50 mol HClO2 and 0.25 mol NaOH. iii) 0.50 mol NaClO2 and 0.50 mol HClO2. iv) 0.50 mol NaClO2 and

55. ## Physics

Standing waves are set up on two strings fixed at each end, as shown in the drawing. The two strings have the same tension and mass per unit length, but they differ in length by 0.55 cm. The waves on the shorter string propagate with a speed of 41.8 m/s,

56. ## physcial science

When 1 kg of ice at 0 degrees Celsius absorbs 80 kilocalories of heat, the ice undergoes a) a change of state b) a loss of energy c) a rise in temperature d) an increase in volulme The heat of fusion of water is 80 kcal/kg. That means that 1 kg of ice will

57. ## english

Select the letter of the term that identifies the function of the phrase in parentheses in the following sentence: One goal is (to see potato-starch food boxes rather than Styrofoam ones). a. adjective e. object of a preposition b. adverb f. direct object

58. ## ICT

explain five uses of ICT in communication, timing and control and information processing and data storage

59. ## Physics

A wooden block of weight 24N lies on a horizontal table,when a force of 12N was applied to the block,it takes the block to "just slide "what is the coefficient of static friction between the block and the table

60. ## chemistry

what is the molar solubility of AgBr(s) in 3.0M NH3(aq)? Ksp of AgBr(s) is 5x10^-13, Kf of Ag(NH3)2+ is 1.6x10^7

61. ## Algebra 2 A

A candy store makes a 9-pound mixture of gummy candy, jelly beans, and hard candy. The cost of gummy candy is \$2.00 per pound, jelly beans cost \$3.00 per pound, and hard candy costs \$3.00 per pound. The mixture calls for two times as many gummy candy

62. ## visual basic

Write a visual basic program to calculate total pay of employee who get an additional pay of 10% to their basic salary if they worked for more than 10years for the company

63. ## Math

Peter has 4 more \$50 bills than \$10 bills in his wallet. If the total amount of money in his wallet is \$380, how many \$10 bills does Peter have? I know the answer but I don't know how to set up the equation.

64. ## Reposting chemistry help!!!

A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need the working.....

65. ## biology

what is the difference between an exergonic reaction and an endergonic reaction?

66. ## Math

My other number is even. My number is less than 300. Using 2,4,5

67. ## density and pressure

calculate the mass of air in a room measuring 5m*8m*10m if the density of air is 1.3kg/m cube

68. ## math last one help

a bead shop sells wooden beads for 3 dollars each and glass beads for 7 dollars each Write a function rule to represent the total selling price of wooden (w) and glass (g) beads.

69. ## math

A kayaker paddles across a river at a constant speed of 4 miles per hour and a bearing of N 60 degrees E. Which current vector results in the kayaker's actual speed being 5.9 miles per hour and the kayakers actual direction being N 70 degrees E.

A pentagonal prism has dimensions that are four times the dimensions of a similar pentagonal prism. So its volume is _____times the volume of the smaller prism. A) 64 B) 8 C)16 D)4 Would it be A) 64? Next Question: If the dimensions of a cylinder are

71. ## math

1) A rancher wants to enclose two rectangular areas near a river, one for sheep and one for cattle. There is 240m of fencing available. Express the area of the enclosures as a function of its dimension. No there is no common side (lets say.) Thanks

72. ## math

1) A rancher wants to enclose two rectangular areas near a river, one for sheep and one for cattle. There is 240m of fencing available. Express the area of the enclosures as a function of its dimension.

73. ## math

1) A rancher wants to enclose two rectangular areas near a river, one for sheep and one for cattle. There is 240m of fencing available. Express the area of the enclosures as a function of its dimension. 2) A container company is designing on open-top,

74. ## Math

Function Table X. Y 0.5. 2 1. 1 2. 0.5 4. 0.25 5 10 What is the function rule that represents the relationship between x and y.

75. ## Physics

A small 0.499 kg object moves on a frictionless horizontal table in a circular path of radius 0.96 m. The angular speed is 6.37 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the

76. ## physics

A rectangle has a length of 2d and a height of d. Each of the following three charges is located at a corner of the rectangle: +q1 (upper left corner), +q2 (lower right corner), and -q (lower left corner). The net electric field at the (empty) upper right

77. ## calculus

Find an equation of the tangent(s) to the curve at a given point. Then graph the curve and the tangent(s). x = 6sin(t), y = t^2 + t; (0,0) How do I do this without the value of t? I don't see a way to eliminate the parameter.

78. ## calculus

I don't quite understand Cartesian equations. I am told to Eliminate the parameter to find a cartesian equation of the curve. X= 3 - 4t, y= 2 - 3t there is no inequality I don't understand what I am trying to find.

79. ## PHYSICS

A car traveling at a constant velocity of 30.0 m/sec passes an intersection at time t=0. 45 seconds later a second car passes the same intersection and its traveling in the same direction at a constant velocity of 55 m/sec. when does the second car

80. ## english

Identify the complete adjective clause and the word it modifies. Many Californians who own homes live on hillsides.

81. ## Trig

cos4x*cos3x + sin4x*sin3x

82. ## math

Which of the following is the equation of a direct variation that has a constant of variation equal to -? y = x - -y = x y = -2x y = -x

83. ## grammar

I have to write 1234.567 in English word form. How do I write this number?

84. ## statistics

Use the data given to test the following hupotheses. Assume the data are normally distributed in the population. Ho: M=7.48 Ha:m>7.48 xbar = 6.91, n=24, sigma=1.21,alpha=.01

85. ## math

what is the simplified form of the expression? (3c^2d^4)^3(2c^5d^8)^3

86. ## Statistics

As standard deviation increases, samples size _____________ to achieve a specified level of confidence. A. Increases B. Decreases C. Remains the same

87. ## math

four times the larger number of two numbers is equal to seven times the smaller.the sum of the numbers is 22.find the numbers

88. ## history of the arts

The Grand Tour was considered a feature of affluent men and women. true or false I am not sure, but reading through the text it says it was the large cultural visit to sites in southern europe. given that i believe it is true!

89. ## history of the arts

The Grand Tour was considered a feature of affluent men and women. true or false

90. ## George School

Ag2CrO4(s) + 2e- 2Ag(s) + CrO42-(aq) A chemist wishes to determine the concentration of CrO42- electrochemically. A cell is constructed consisting of a saturated calomel electrode (SCE; which has a reduction potential of 0.242 V relative to the SHE) and a

91. ## MATH

The Bainters purchase the \$150,000.00 home with a 20% down payment, a 30-year mortgage, and an interest rate of 4.2%. Annual property taxes are \$1920.00. Home insurance is \$750.00 per year, which is to be placed into an escrow account. What is the total

92. ## Math

The Bainters purchase the \$150,000.00 home with a 20% down payment, a 30-year mortgage, and an interest rate of 4.2%. Annual property taxes are \$1920.00. Home insurance is \$750.00 per year, which is to be placed into an escrow account. What is the total

93. ## Physics

A stone projected vertically upward with a speed of 30ms from the top of a tower of height 50m neglecting the air resistance.determine the maximum height it reach from the ground

94. ## science

calculate the mass of solute needed to preaqe 1000ml of 1.1M CuSO4

95. ## social studies

How is the government of Belarus different from those of other European countries? A. It is a theocracy led by religious leaders. B. It is a dictatorship with a ruler who has held power for many years. C. It is a monarch, in which power is handed down to

96. ## Physics

What is friction

97. ## life orientation

how can sports detract nation building

98. ## Physics

A green car with a mass of 900 kg is placed in the back of a yellow tow truck that has a pivot at one end. The car is held in place with a chain at the top end of the lift, as pictured below. The chain holding the car in place can withstand a maximum force