# Joel

Popular questions and responses by Joel

An ice cube that is 3 cm on each side is melting at a rate of 2 cm cubed per minute. how fast is the length of the side decreasing?

2. ## physics

A cage descends a mine shaft with an acceleration of 0.5 m/s2. After the cage has travelled 25 metres, a stone is dropped from the top of the shaft. Determine : 1. the time taken by the stone to hit the cage, and 2. distance travelled by the cage before

3. ## Mathematics

calculate the tax paid by a single person earning #110 600per annum

4. ## physics

A flywheel is making 180 r.p.m. and after 20 seconds it is running at 140 r.p.m. How many revolutions will it make, and what time will elapse before it stops, if the retardation is uniform ?

5. ## geometry

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radii and altitudes is 4:3?

7. ## Math

A doctor orders a dosage of 5 ml of medicine every 4 hours for 8 days how many fluid ounces of medicine should be purchased Help sole

8. ## Principles of Management

Question 1 of 20 5.0 Points Which of the following is NOT a benefit of planning? A. Helps you check on your progress B. Helps you think ahead C. Helps you cope with uncertainty D. Helps you compare your results to a standard Reset Selection Question 2 of

9. ## maths

Prove that in any triangle ABC Sin2A+Sin2B+Sin2C/SinA+SinB+SinC=8Sin(A/2)Sin(B/2)Sin(C/2)

10. ## math

A stunt motorcyclist makes a jump from one ramp 20 feet off the ground. The jump between ramps can be modeled by y= -1/640x^2 + 1/4x +20 where x is the horizontal distance (in feet) and y is the height above ground (in feet). I think a is 20 feet, but I

11. ## Maths

Cynthia’s afternoon train normally arrives at her station at 5:30 pm each day, where she is picked up by Alan and driven home. One day she was on an earlier train which arrived at 5 pm, and she decided to walk in the direction Alan was coming from home.

12. ## Chemistry

What is a photon? Several selections may be correct. Has an energy of equal to hν. Is a unit of electromagnetic radiation. Is a part of the electromagnetic spectrum. Is usually called visible light. None of these.

13. ## Statistics

The amount of fill(weight of contents)put into a glass jar of spaghetti sauce is normally distributed with mean=850g and standard deviation=8g.the probability that a random sample of 24 jars has a mean weight greater than 848g is?need help

14. ## math

I am a 2-digit number. My ones is 3 more than my tens and the sum of my digits is 11. What number am I ?

15. ## Maths

Prove That Sin2A+ Sin2B +SIN2C/sinA+SINB+SINC=8sinA/sinB/2COSC/2

16. ## Maths

Prove that cos3x/cosx-cos6x/cos2x=2(cos2x-cos4x)

17. ## geometry

Write a two-column proof. Given: 7y = 8x – 14; y = 6 Prove: x = 7

18. ## english

Which of the sentences below is an excerpt taken from "In Another Country" by Ernest Hemingway is an example of irony? A. My knee did not bend and the leg dropped straight from the knee to the ankle without a calf, and the machine was to bend the knee and

19. ## Chemistry

2. In a calorimeter, 40.0g water at room temperature (20.4 C) was mixed with 60.0 g of water that was initially 48.9 C. The resulting mixture reached a maximum temperature of 37.3 C. Calculate each of the following. a) The heat released by the hot water.

20. ## math

if i have a book of 30 pages and i want to number each pages what will be the digit for the thirty pages

21. ## college trig word problem

A Ferris wheel has a radius of 25 feet.The wheel is rotating at two revolutions per minute.Find the linear speed, in feet per minute, of a seat on this ferris wheel.

22. ## lit

What did the philosopher Aristotle mean when he said, "To perceive is to suffer"? Did I punctuate correctly?

23. ## History

A more unified African American culture began to emerge in the early decades of the nineteenth century because? the Gullah dialect spread to the new slave territories in the Old Southwest. the rapid transfer of slaves from other regions into the Lower

24. ## Maths

Prove By induction that sinx + sin3x + sin5x +.... Sin(2n-1) =sin^2(nx)/sin3x

25. ## science

light that has a frequency of 1.5 x 1015 Hz.

26. ## chem

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.10 of sodium carbonate is mixed with one containing 4.43 of silver nitrate. How many grams of silver nitrate are

27. ## Chemistry

You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 379.0 ppm and is initially uniform through the thickness of the

28. ## Maths

Mr Zubir bouught a pair of pants, a shirt and a coat. The pair of pants and shirt costs \$100.90. The pants and coat costs \$244.50. The coat costs 5 times as much as the shirt. How much did Mr Zubir pay for his coat?

29. ## LIT

Dresden was a German city destroyed by the allies in WWII. Which of the following most likely describes the allusion to Dresden? A Dresden was the center for the production of weapons that supported the German war effort. B Dresden was a city rich with old

30. ## Calculus - Related Rates

Bacteria are growing in a circular colony one bacterium thick. The bacteria are growing at a constant rate, thus making the area of the colony increase at a constant rate of 12 mm sq. per hour. Find an equation expressing the rate of change of the radius

31. ## Algebra

6x²y³ + 9x²y³ 15x²y³ ------------- = ---------- 3x²y² 3x²y² = (15/3) (x²/x²) (y³/y²) = 5y Just want it to know if is correct, but don't y³ + y³ = 2y³? I'm confused now. Can someone please help? yes, the answer is 5y and yes, y³ + y³ =

32. ## CHemistry

Which one of the following is expected to be the strongest Lewis acid? Fe, Fe+, Fe2+, Fe3+ Which do you think would accept electrons the easier? Fe(s) or Fe^+? Do that same kind of logic on the others one by one.

33. ## Algebra 1

how do i graph x + y = 1 put y on one side y=-x+1 im doing an online test and its asking me to find the equation that matches the graph. But im not sure how to figure it out. well the graph should have a negative slope with 1 as y-intercept look for a

34. ## Social Studies

What is Nunavut's nickname and motto? Scroll down to the weather section of this site for Nunavut's nickname. (Broken Link Removed) This site has its motto. http://homeschooling.about.com/library/blcanumotto.htm

35. ## Math

I bought a new Keurig coffee pot for \$130.00, which include 6% sales tax. What was the original price of the Keurig?

36. ## Chemistry

For the following reaction,determine the amount of agcl formed (collected in laboratory) when 10.24 g of kcl react with excess agno3 to produce agcl and kno3 with a 77.24% yield.

37. ## math

how many numbers are greater than 22 but less than 32?

38. ## math

c. What do the slope and y-intercept mean in the context of this problem? Hint: What do you pay when you step into the cab?

39. ## Math

Let y=e^(cos^-1x) for modx

40. ## Social studies

why does the cartoon from the bank war 1832 portrat president jackson as a king

41. ## Math

Parmjit has 8 base ten blocks. She has at least one of each type of block. The value of her blocks is between 400 and 600. What blocks could she have? Find the possible answers using an organized list.

42. ## Maths

Prove That Sin2A+SIN2B+SIN2C/SINA+SINB+SINC=8SinA/2SINB/2SINC/2

43. ## physics

A locomotive is running at a constant speed of 100 km/ h. The diameter of driving wheels is 1.8 m. The stroke of the piston of the steam engine cylinder of the locomotive is 600 mm. Find the centripetal acceleration of the crank pin relative to the engine

44. ## Physics

1 Angstrom = how many Coulombs?

45. ## Physics

An infinitely long thin metal strip of width w=12cm carries a current of I=10A that is uniformly distributed across its cross section. What is the magnetic field at point P a distance a=3cm above the center of the strip? I have tried using the integration

46. ## math (Algebra)

(c+x)squared ----------------- 2y c= -8 x= 10 y= 6

47. ## math

if i have abook of 30 pages and i number each pages, how can i figure the digit number

48. ## graphing question

how do i get the slope formula of: (4,-1) and (3,-1)? Then the Point slope form:Slope=4,passes through (1,3)?

49. ## Chemistry

How do I calculate the mass of sodium carbonate required to neutralize 15-20 mL of 0.25M HCl at the stoichiometric point?

50. ## physics

How much kinetic energy does a 2000 kg traveling 70 mph have?

51. ## geometry

the amount of metal in the nut?

52. ## maths

16 similar writing pads and 24 similar jotter books are stacked in a pile. their total thickness is 14.4cm.Each writing pad is 3x as thick as each jotter book. what is the thickness of the pile of jotter books? Please show me a non-algebraic method of

53. ## Math

Abdul and his brother weigh 15.25kg. Abdul and his father weigh 72.25kg. What is Abdul's weight?

54. ## english

what is the allusion. Last year our school’s finances were in shambles. Overspending and little control over money has resulted in a situation where there is no money for new books or supplies. School officials are even wondering where they will find the

55. ## Lit class

Did I punctuate this correctly? "Daddy, why is the sky blue?" Martinique asked her father. the quotation mark goes behind the question mark right?

56. ## Physics

A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what

57. ## Physics

A 3kg mass moving initially to the right along the x axis with a speed of 8m/s makes a perfectly inelastic collision with a 5kg mass initially at rest at the origin.what fraction of the initial kinetic energy of the system is lost in the collision.what

58. ## Maths

is 10*10exponent -3 a scientific notation?

59. ## Physics

Two points charges of 2uC and -6uC are located at the position(0.0)m and (0.3)m.Calculate the total electrical potential at the point (4.0)m due these two charges.

60. ## Physics

A proton is released from rest in a uniform electric field which is directed along the x axis and of magnitude E=2*10exponent5 V/m.The proton undergoes a displacement from point A at the origin to point B at x=0.2m.What is the change in the potential

61. ## Physics

if a ball is thrown straight upward and is caught 5s after being thrown,how fast must it have been going when it left the person s hand?help

62. ## Physics

A gas is taken though a single process in which its volume decreases by .25 m^3 as the temp of the gas rises 2deg C. Which of the following people are more likely to have reached the correct conclusion? a. Bob Identifies this process as adiabatic b. Jill

63. ## Math

Two sides of a triangle have the same length. The third side measures 4 meters less than twice the common length . The perimeter of the triangle is 16 meters. What are the lengths of the three sides?

64. ## calculus

find the integral of square root of 1+x^3 dx or sqrt(1+ x^3)dx

65. ## Macro Economics

Can it be considered acceptable to policy makers to have about 7 million people classified as unemployed in the U.S.? Explain.

66. ## Algebra

Ann sells apples and Beth sells oranges. Today, half the number of apples than Ann sold was fifteen less than thrice as much the number of oranges that Beth sold. I just want it to know; how do I convert it into an algebraic expression or equation? Is

67. ## Chemistry

If an equal number of moles of the weak acid HOCN and the strong base KOH are added to water, the resulting solution will be acidic, basic or neutral? There is a complicated answer and a sensible answer. Both arrive at the same answer. But here is the

68. ## Physics

Find the force of attraction b/w two equal but opposite charge of 2*10micro, if the distance between them is 25cm

69. ## math

7500 grams to the nearest gram

70. ## Math

I want to find a more efficient way for finding LCM's (Lowest Common Multiple) Can someone tell me a better way instead of trial and error? Thank you.

71. ## Math

A water tank can hold 56 5/7 litres of water. How much water is contained when it is 2/5 full?

72. ## Math

A water tank can hold 56 5/7 litres of water. How much water is contained in the tank when it is 2/5 full?

73. ## Chemistry

× a 25cm³ aliquot of ammonium iron(ii) tetraoxomanganate(vii) containing 32.9g of its salt in 250cm³ solution, needed 25cm³ of potassium tetraoxomanganate(vii) solution for a colour change to occur. what is the concentration of the potassium

74. ## chemistry

× a 25cm³ aliquot of ammonium iron(ii) tetraoxomanganate(vii) containing 32.9g of its salt in 250cm³ solution, needed 25cm³ of potassium tetraoxomanganate(vii) solution for a colour change to occur. what is the concentration of the potassium

75. ## math

prove dat Cos(18°) = 1/4√10+2√5

76. ## Math

Complete the table Yards is blank Feet= 29 Inches= 348 Help find yards Help solve

77. ## math

March 1- \$550 rent (check) March 2- \$286 tuition (check) March 3- \$200 paycheck March 4- 275 bookstore check March 5- \$60 withdrawn from ATM March 6- \$40 food (debit) March 7- \$45 date desert March 8- N/A March 9- \$40 gas March 10 - \$200 paycheck March 11

78. ## math

Week No 1 2 3 4 5 6 7 Weight change -2 -2 3 -2 -2 3 -2 Write her weight losses and gains using multiplications. Please help solve

79. ## math

. Bonita uses her debit card to withdraw \$40 from her savings account every week for 7 weeks. What is the change in her account balance at the end of 7 weeks? help solve

80. ## math

A cold front moves through your hometown in January, dropping the temperature an average of 3 F per day for 5 days. Write an expression that uses multiplication to describe the changes in temperature from the start to the end. Help solve

81. ## Math

The temperature in Minot, North Dakota registered 18 degrees F. The wind chill factor made it feel negative 10 degrees. What is the difference between the actual temperature and the perceived temperature? Help solve

82. ## Math

the question is to "rotate the line the given number of degrees a about the x-intercept and (b) about the y-intercept. Write the equation of each image" and the problem is y=2x+2 ; 90 degrees and i dont know what to do

83. ## geometry sem 2 APEX

Question 1 of 10 Multiple Choice: Please select the best answer and click "submit." A closet contains 8 pairs of pants, 10 shirts, and 4 pairs of shoes. How many leaves on a tree diagram would represent all possible combinations of outfits? A. 80 B. 22 C.

84. ## math

How many centavos are equal to P2.50?

85. ## math

.) Dino gathered 72 eggs from one poultry house and 48 from another. How many more eggs did he gather from the first house?

86. ## math

I am a 2 digits number. My ones is 3 more than my tens and the sum of my digits is 11. What number am I?

87. ## math

how many centavos are equal to P2.50

88. ## Maths

If The Roots Of The Equation X^2- bx+c are square root of alpha and square root of beta .show that alpa + beta = b^2- 2c and (alpha)^2 + (beta)^2 = (b^2 -2c - sqrt of 2c)(b^2 - 2c + sqrt of 2c)

89. ## Social Studies

in 3-5 sentences describe the apportionment system for state legislative districts I cant seem to think of any please help

90. ## math

use the method of substitution to solve the following pairs of simultaneous equation. 2m+n=0,m+2n=3

91. ## Social Studies

1. What was the landscape of the country prior to Imperialism? 2. What kind of resources made the country a commodity to the colonizers? 2. Who lived there? What was their daily life like? 4. What kind of leadership and hierarchy did the civilization

92. ## Maths

If X,y,a and b are real numbers and if x+yi = a/b+cosp+isinp , show that (b^2-1)(x^2+y^2)+a^2 =2abx

93. ## Math

Parmjit has 8 base ten blocks. She has at least one of each type of block. The value of her blocks is between 400 and 600. What blocks could she have? Find the possible answers using an organized list.

94. ## Maths

Thnx Reiny & Steve 4 d help rendered in per the past questions. Plse help in this, If the line through the point y=2x+c touches the hyperbola 4(x)^2-6(y)^2=24. Show that c=+-2sqrt5.

95. ## maths

A variable tangent to the ellipse (x/a)^2 +(y/b)^2 meets the parabola y^2=4ax at L and M. Find the locus of the midpoint of LM.

96. ## maths

A Variable Tangent To The Ellipse (x/a)^2 + (y/b)^2 =1 meets the parabola y^2=4ax at L and M. Find the locus of the midpoint of L M

97. ## History

what statement best describes the government relationship with England that was in the middle colonies A. Middle colonies were all established as royal colony B.each have a different system based on the charter agreed upon with the king of England C.The

98. ## Physics

Given Two parallel plate capacitors with a seperation d(metres) in free space connected to a dc supply of volts,v. A dielectric material of thickness b(metres) is inserted between the plates so that a distance (d-b)m remains without dielectric. Show that

99. ## Maths

Plse Help how do you obtain the maximum value and minimum value of a quadratic equation like for , 1/11+8x-2x^2