# joel

Most 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. ## 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?

3. ## Social studies

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

4. ## Maths

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

5. ## 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.

6. ## 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 ?

7. ## 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.

8. ## Chemistry

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

9. ## 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

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. ## 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.

12. ## 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

13. ## Can't understand trig problem

An airplane left an airport and flew east 174 miles. Then it turned northward flying along a bearing of N22E. When it was 254 miles from the airport, there was an engine problem and it turned back to take the shortest route possible back to the airport.

14. ## History

which represents an aztec adaptation to their environment A. A surplus of farmed crops B.an accurate 365 day calendar C.a system of causeways D.farming in terraces

15. ## 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

16. ## Math

Help! Toshiro Hashimoto invested some money at 4.5% simple interest and \$1000 more than four times the amount at 6%. His total annual income for one year from interest on the two investments was \$801. How much did he invest at each rate?

17. ## 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.

18. ## 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.

19. ## Maths

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

20. ## 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

21. ## Maths

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

22. ## 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

23. ## 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

24. ## Maths

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

25. ## 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 ?

26. ## math

The sum of two decimal numbers is 3.9 Their difference is 0.9,and their product is 3.6 What are the two numbers?

27. ## lit

"One day I'm going to be an astronaut," Adelle told her sister. Did I punctuate correctly?

28. ## 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

29. ## 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?

30. ## lit

n 1946, Albert Einstein said if he had known the Germans wouldn't succeed in constructing the atom bomb, he "would never have lifted a finger." Did I punctuate correctly?

31. ## lit

Jocelyn asked her mom, "What was it like when you were a child?" Did I punctuate correctly?

32. ## lit class

we are really stuck on this one we searched the website that you suggested but are still stuck this is what we came up with is this correct punctuation? Jawaharlal Nehru, the first prime minister of independent India, said that, "culture is the widening of

33. ## 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.

34. ## 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

35. ## lit

When Marcos walked into the room, we turned on the lights and yelled, "Happy birthday!" is this correct punctuation?

36. ## lit

Antony invited us over to check out his, "awesome new board." is this correct

37. ## Chem

The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.

38. ## algebra

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -3x + 4y = -19.5 -3x + y = -10.5

39. ## 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

40. ## lit

"Maybe we should wait to begin until everyone is seated," Ana said to her band mates. did I punctuate this correctly?

41. ## Chemistry

If the temperature of 150.0g of water increased from 23.3C to 44.8C, how much heat was absorbed

42. ## 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

43. ## lit

"Ouch, that hurts!," Kadra said after stubbing her toe. is this correct?

44. ## Maths

A right circular cone is circumscribed about a sphere of radius a .If h is the distance from the centre of the sphere to the vertex of the cone. Show that the volume of the cone is 1/3pi a^2(a+h)^2/(h-a). Find the angle of a cone when the volume is minimum

45. ## lit

Ms. Sardelis said we must "absolutely and without delay" turn in our permission slips by tomorrow or we can't go on the class trip. is this correct

46. ## 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?

47. ## 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

48. ## 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

49. ## 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.

50. ## 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.

51. ## 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?

52. ## Statistics

The null hypothesis,H0:u=48,was tested against the alternative hypothesis,H1:u>48.A sample of 75 resulted in a calculated p-value of 0.102.if standard deviation=3.5,the value of the sample mean is?need help

53. ## 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.

54. ## 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

55. ## Geometry

Can you tell em if this is right? If not, can you tell me what words go where? A truth value statement can be written in the form “if P, then Q.” This “if, then” statement can be true or false. The “if” part is called the hypothesis, and the

56. ## physics

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

57. ## lit

My mom says "Never wear anything but a suit to a funeral or a wedding." is this correct punctuation?

58. ## 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

59. ## math

Write a missing addend addition sentence to help solve 78-49.explain how you would use it.

60. ## 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 =

61. ## Math

The Distributive Property: Find the product mentally. Show the steps you used. 8*34 I know that 8*34=272 but how you do it with Distributive Property? Thanks!

62. ## One SS Question!

What was one event that helped make the US a world power? a. The country experienced the Great Depression. b. The country fought in World War I *** c. The country the Peace of Paris. d. The country fought in the French and Indian War.

63. ## 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

64. ## Math

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

65. ## 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

66. ## 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

67. ## Physics

1 Angstrom = how many Coulombs?

68. ## lit

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

69. ## Statistics

Of 100 people who were given a vaccine,80 developed immunity to a disease.the 98% interval on the proportion of people developing immunity is?need help

70. ## math

Tyrell says \$750 is about \$800.Sara says \$750 is about \$700.who is correct?explain.

71. ## Chemistry

What is the pH of a 1.0E-8 M solution of HCl? Please note that you cannot simply add the contribution of H+ ions from the autoproteolysis of water and the contribution from the dissociation of HCl. You will need to use the quadratic equation to solve this

72. ## 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

73. ## math

If Matt filled a 2 1/5 cup container, how many 1/5 cups would he need to use??

74. ## Lit class

I'm going to be asking for the help for all of us does this have correct punctuation? two of us said no and the other two says yes My mom says "Never wear anything but a suit to a funeral or a wedding."

75. ## algebra

Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. x + 10y = 41 x + 9y = 37

76. ## 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?

77. ## 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

78. ## 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

79. ## Chem

You have a 46.0 G sample of H20 at a temperature of -58.0*C. How many joules of energy are needed to heat the ice to 95.3*C?

80. ## English

I really need help with my writing. I need some to proof read a paper that I wrote. Two Career Families versus One Career Families Back in the early days the traditional working family was a one career family. The roles of husband and wife were defined and

81. ## lit

Copán is one of the most impressive sites for ruins of the ancient Maya civilization. Situated in western Honduras, Copán is where the great Maya civilization flourished. Though other Maya ruins have been found in neighboring countries, no other quite

82. ## lit

The defendant stated that she was, "not guilty." is this correct punctuation?

83. ## Chemistry

a 23ml H2SO4 solution is titrated by 50 ml 0.10 M NaOH solution, what is the molarity of H2SO4 solution? (Note that H2SO4 is a diprotic acid)

84. ## Ohysics

An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b.

85. ## English

Could someone help with the main idea of this paragraph? Please and thank you Old Man Warner snorted. 'Pack of crazy fools," he said. "Listening to the young folks, nothing's good enough for them. Next thing you know, they'll be wanting to go back to

86. ## 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

87. ## maths

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

88. ## science

light that has a frequency of 1.5 x 1015 Hz.

89. ## Math

A bus makes 28 stops every 2 hours. How many stops does it make in 3 hours? in 4 hours? How do you get 42 stops; 56 stops? Thanks!

90. ## Literature & Writing

In Bless Me, Ultima I have some questions about the scenes where Antonio talk with Florence about sin and God in chapter 17. The page numbers are in the 190s in the small book or early 200s in the bigger book. I lots of ideas, but it's nice to have

91. ## Maths

The breadth of a rectangular plot of land is 85% of its length. The difference between the length and breadth is 18m. A) what is the length B) what is the area

92. ## lit

What is the historical allusion? For the last several months, Rebecca had been working with her team on raising money in her neighborhood to donate to the hurricane Katrina Relief Fund. They were having a competition with groups to see who could raise the

93. ## 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

94. ## Physics

A lightning bug flies at a velocity of 0.25m/s due east toward another lightning bug seen off in the distance. A light breeze blows from the east on the bug at a velocity of 0.25m/s. What is the resultant velocity of the lightning bug? Please direct me to

95. ## Language Arts

I need the complete predicate in this sentence? Ida B. Wells was born into slavery in 1862 in Holly Springs, Mississippi.

96. ## trig

what is the tan of 25 degrees and 01 minute

calculate the mass of 100 ppm of CO2 int the atmosphere if the atmospheres mass is 5.3x10^18 kg

98. ## math problem

The diameter of a circle is increased by enough to increase the circumference by 20%. By what % is the area of the circle increased ? ( Hint: Try a number like t=5.)

99. ## geometry

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