# joey

Most popular questions and responses by joey
1. ## Vince

Please show work for Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? thank you very much for your help

2. ## physics

A uniform solid sphere rolls down an incline. (a) What must be the incline angle if the linear acceleration of the center of the sphere is to have a magnitude of 0.20g? 1° (b) If a frictionless block were to slide down the incline at that angle, would its

3. ## physics

Extreme-sports enthusiasts have been known to jump off the top of El Capitan, a sheer granite cliff of height 910m in Yosemite National Park. Assume a jumper runs horizontally off the top of El Capitan with speed 5.0m/s and enjoys a freefall until she is

4. ## American Government

The question in every case is whether the words used are used in such circumstances and are of such a nature as to create a clear and present danger that they will bring about the substantive evils that Congress has a right to prevent. –Schenck v. United

5. ## Precalculus

The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of -0.4 . Suppose that the height of the candle after 13 hours is 24.8 centimeters. What

6. ## math

The area of the base of a rectangular juice box is 4 1/2 square inches. If the volume of the box is 18 cubic inches, how tall is the box?

7. ## statistics

Determine the sample size required to estimate a population proportion to within 0.032 with 95.7% confidence, assuming that you have no knowledge of the approximate value of the sample proportion. Sample Size = B. Repeat part the previous problem, but now

8. ## Calculus

A construction company wants to build a rectangular enclosure with an area of 1000 square feet by fencing in three sides and using its office building as the fourth side. Your objective as supervising engineer is to design the enclosure so that it uses the

Hershey and Chase used the 35S isotope to label proteins. How does this isotope differ from the 32S isotope found in greatest natural abundance, and why did they choose 35S instead of 32S? A)35S has more protons than 32S; Hershey and Chase used it because

10. ## Calculus (optimization problem)

A cyclinderical tank with no top is to be built from stainless steel with a copper bottom. The tank is to have a volume of 5ð m^3. if the price of copper is five times the price of stainless steel, what should be the dimensions of the tank so that the

11. ## Biology- check my answer (diff one)

Which of the following are true concerning living things? Check all that apply. A)They contain a vital force absent in nonliving things. B)They are composed of molecules that contain carbon-carbon bonds. C)They undergo chemical reactions to use energy they

12. ## Chemistry

1- Determine the [OH-] and pH of a solution that is .250 M in HCO-3 2- Calculate the [H3O+] and pH of each polyprotic acid solution: a) .125 M H2CO3 b) .125 M H3C6H5O7

13. ## Geometry

the steps that you would follow to recreate a triangle using a protractor, a string, and the AAS Congruence Theorem, written out in words. I'm lost know that you need two angles and a side.No clue how to explain. Please help I've been sitting here all day

A chocolate bar is separated into several equal pieces. If one person eats 1/4 of the pieces, and a second person eats 1/2 of the remaining pieces, there are six pieces left over. Into how many pieces was the original bar divided?

15. ## physics

A plum is located at coordinates (-4.0 m, 0.0 m, 6.0 m). In unit-vector notation, what is the torque about the origin on the plum due to force F whose only component is indicated by each of the following equations? (a) Fx = 8.0 N ô = N · m (b) Fx = -5.0

16. ## Chemistry Dimensional analysis

A cyclist rides at an average speed of 18 miles per hour. if she wants to bike 212km, how long in hours must she ride? What I have so far.. 212km(10^3 miles

17. ## Algebra

Find the sum of the following series. 14 n=1 (2n+1) A. 448 B. 256 C. 240 D. 224

18. ## Pre-Algrebra

Two cell phone companies have different rate plans. Runfast has monthly charges \$10 plus \$4 per gig of data. B A &D’s monthly charge is \$6 plus \$6 per gig of data. Your task, is to determine under what circumstances each company has the better pricing.

19. ## science

Suppose that the 1.3 km span of the golden gate bridge had no expansion joints. Calculate how much longer the bridge would be if the temperature of the bridge increases by 35 degrees celsious

20. ## @elena

You helped me with this question earlier today, the answer you got was incorrect, i tried looking through your calculations but i cant find the mistake. the program wont let me see the right answer just tells the answer i put in was wrong. can you please

21. ## History

What do colonialism and imperialism both require

22. ## math

A standard deck of cards has had all the face cards (Jacks, queens, and kings) removed so that only the ace through ten of each suit remains. A game is played in which two cards are drawn (without replacement) from this deck and a six-sided die is rolled.

23. ## chemistry

Your body deals with excess nitrogen by excreting it in the form of urea, NH2CONH2. The reaction producing it is the combination of arginine (C6H14N4O2) with water to give urea and ornithine (C5H12N2O2). C6H14N4O2 + H2O  NH2CONH2 + C5H12N2O2 [Molar

24. ## Chem 400

Direct reaction of solid iodine (I2) and gaseous chlorine (Cl2) produces an iodine chloride,(IxCly), a bright yellow solid. 0.678 g of iodine (I2) is mixed with 0.851 g of chlorine (Cl2). After the elements react, some chlorine is left over along with a

25. ## Trigonometry

Mountain officials want to build a new ski lift from B to C as shown in the figure below. The distance from A to C is 1480 feet. They measure angle DAC to be 32 degrees and angle DBC to be 18 degrees. What is the distance A from to B? Round your answer to

26. ## Geometry

7. What is the surface area of a conical grain storage tank that has a height of 24 meters and a diameter of 16 meters? Round the answer to the nearest square meter. (1 point) 837 square meters 848 square meters 1,991 square meters 1,923 square meters 8.

27. ## Physics

A 55.0kg cheerleader uses an oil-filled hydraulic lift to hold four 130kg football players at a height of 1.20m. If her piston is 19.0cm in diameter, what is the diameter of the football players' piston?

28. ## Physics help!!

A Styrofoam bucket of negligible mass contains 1.60 kg of water and 0.425 kg of ice. More ice, from a refrigerator at -14.8 degree C, is added to the mixture in the bucket, and when thermal equilibrium has been reached, the total mass of ice in the bucket

29. ## Physics

Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the

30. ## phyics

A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 1.1 m/s. Determine the amplitude A of the motion.

31. ## Calculus

The management of the UNICO department store has decided to enclose an 870 ft2 area outside the building for displaying potted plants and flowers. One side will be formed by the external wall of the store, two sides will be constructed of pine boards, and

32. ## physics'

A 100 kg hoop rolls along a horizontal floor so that the hoop's center of mass has a speed of 0.230 m/s. How much work must be done on the hoop to stop it?

33. ## Physics

Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the

34. ## Calculus

The volume V of a growing spherical cell is V =4/3πr^3, where the radius is measured in micrometers (1 µm = 10^−6m). Find the average rate of change of V with respect to r when r changes from 3 to each of the following. i)3 to 6µm ii)3 to 4µm

35. ## physics

An automobile traveling at 50.0 km/h has tires of 100.0 cm diameter. (a) What is the angular speed of the tires about their axles? 1 rad/s (b) If the car is brought to a stop uniformly in 25.0 complete turns of the tires (without skidding), what is the

36. ## geometry

FIND A POINT E ON CD SUCH AS THE RATIO OF CE TO CD IS 1/4.' ANSWER CHOICE A. -7 B. - 5 C. -3 D. -1

37. ## physics

A bullet of mass 8 g strikes a ballistic pendulum of mass 2.0 kg. The center of mass of the pendulum rises a vertical distance of 10 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.

38. ## Physics: Vectors

A hiker walks 10.0 km[NE], 5.0 km[W], and then 2.0 km[S] in 2.5 h. (a) What is the hiker's displacement? (b) In what direction must the hiker set out, in order to return by the most direct route to the starting point? (c) If the hiker walks at a constant

39. ## chemistry

how many grams of NaOH must be added to 0.250 litres of water to form a solution of PH=10.0?

40. ## physics

The figure below gives the speed v versus time t for a 0.510 kg object of radius 5.90 cm that rolls smoothly down a 30° ramp. What is the rotational inertia of the object? 1 kg·m2

41. ## Math

The cost of admission to the State Fair changed from \$8.50 last year to \$10.00 this year. Round to the nearest tenth. Show your work a.) What is the percent of change from last year to this year? b.) Is this a percent of increase or decrease? c.) If you

42. ## journalism

You have recently been hired as the news director for a local news station. It’s time to prep for your first newscast. Your newscast will have five blocks and will be 60 minutes long. You need to cover the following in your newscast: Scores from last

43. ## Math

how would you solve this problem? Adult tickets to a play cost \$12 and children's tickets cost \$5. If 220 tickets were sold and \$2542 was collected, how many of each kind of ticket was sold? There are 500 seats in the theater and 280 seats are already

44. ## Chemistry

How many molecules are in 5.2L of carbon dioxide gas?

45. ## phyics

When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 5.0 x10-7 m and a maximum speed of 3.3 x10-3 m/s. (a) What is the frequency (in Hz) of the eardrum's vibrations? (b)

46. ## biology

In guinea pigs, the allele for a rough coat (R) is dominant over the allele for a smooth coat (r). A heterozygous guinae pig (Rr) and a homozygous recessive guinea pig (rr) have a total of nine offspring. The punnett square for this cross shows a 50

47. ## American Governent

1. What type of power does the Constitution grant to the Supreme Court? (1 point) executive power federal power judicial power legislative power 2. Which are examples of judicial restraint in the Supreme Court? Select all that apply. (3 points) The verdict

48. ## Statistics

A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution, with a population standard deviation of 5.10 gallons. A random sample of 60 days shows

49. ## Pre Calculus

A cylinder shaped can needs to be constructed to hold 200 cubic centimeters of soup. The material for the sides of the can costs 0.02 cents per square centimeter. The material for the top and bottom of the can need to be thicker, and costs 0.06 cents per

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2,

51. ## Physics

Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the

52. ## Mathematics

Does anyone have an idea? A jazz band sells 31 large boxes of fruit and 74 small boxes of fruit for a fundraiser. a. Write and simplify an equation using distributive property to find the profit. b. A large box of fruit costs \$9 and a small box of fruit

53. ## Math 120

Write 4logb(X)-1/3logb(y)+2logb(z)as a single logarithm Its log base b.

54. ## physics

A 1000 kg car has four 20 kg wheels. When the car is moving, what fraction of its total kinetic energy is due to rotation of the wheels about their axles? Assume that the wheels have the same rotational inertia as uniform disks of the same mass and size. 1

55. ## chem

A 250 mL sample of oxygen is collected over water at 25 degrees Celcius and 760.0 torr pressure. What is the pressure of the dry gas alone?

56. ## Marh

the volune if a right circular cylinder is 22 cubic what us the volume in cubic cemimters of a rught cubic cylande with twice the radius and half the height

57. ## Math-Calc

Water is leaking out of an inverted conical tank at a rate of 14000.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8 meters and the diameter at the top is 6.5 meters. If the

58. ## Calculus

A light is hung 15 ft above a straight horizontal path. If a man 6 ft tall is walking away from the light at the rate of 5 ft/sec, how fast is his shadow lengthening and at what rate is the tip of the man’s shadow moving?

59. ## phyics

An object on a vertical spring oscillates up and down in simple harmonic motion with an angular frequency of 25.1 rad/s. Calculate the distance d by which the spring stretches from its unstrained length when the object is allowed to hang stationary from

60. ## physics

In the figure below, a constant horizontal force !@#\$%^&p of magnitude 17 N is applied to a wheel of mass 8 kg and radius 0.70 m. The wheel rolls smoothly on the horizontal surface, and the acceleration of its center of mass has magnitude 0.75 m/s2. (a) In

61. ## physics

A hollow sphere of radius 0.30 m, with rotational inertia I = 0.072 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at 25° to the horizontal. At a certain initial position, the sphere's total kinetic energy is

62. ## calculus

A car braked at a constant deceleration of 45 ft / s2, producing a skid mark measuring 115 feet before coming to a stop. How fast was the car travelling when the brakes were first applied?

63. ## Math

A woman drove her car on a road running due north at a given rate for 6 hours. She continued her trip on an unsaved road due east for 5 hours at a rate of 4mph slower. Had she been able to go to her destination in a straight line from her starting point

64. ## phyics

An object on a vertical spring oscillates up and down in simple harmonic motion with an angular frequency of 25.1 rad/s. Calculate the distance d by which the spring stretches from its unstrained length when the object is allowed to hang stationary from

65. ## trig and geometry

bernhardt and julia are observing an eagles nest in a tree. Julia is 75m from the tree, and sees it at an angle of elevation of 42 degrees A)How high up the tree is the nest B)Bernhardt is standing 30m behind julia. At what angle of elevation does he see

66. ## Math 111

This is a question that deals specifically with WebWork. Here is the question: Write the set of points from -2 to 4 but excluding -1 and 4 as a union of intervals my solution to this would be: [-2,4]U(-1,4) my reasoning: The first set includes -2 and goes

67. ## math

cindy is making a punch for a party. the recipe calls for 3 bottles of cranberry juice in order to make enought punch to serve 40 guests. how many bottles of cranberry juice wil cindy need in order to make enough punch to serve 100 guest?

68. ## math

according to some student,what is the true purpose homework

69. ## math

In rolling a pair of dice, suppose you win \$5 if the sum is 10 but lose \$2 if the roll is "doubles." If the price to play is \$1, would it be a fair game? Justify your answer.

70. ## Algebra

A ladder is placed against the side of the house. The top of the ladder is 12 ft above the ground. The base wof the ladder is 5feet away from the house. Find the length of the ladde.

71. ## Physics

Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the

72. ## Physics

A wheel rotating initially at an angular velocity of 1.0 rad/s, accelerates over a 10 S interval at a rate of 0.1 rad/s^2. What angular displacement does the wheel undergo in this 10 S interval, in terms of revolutions?

73. ## math

The volume inside a rectangular storage room is 2,025 cubic feet. The room is 9 feet high. Find the area of the floor.

74. ## Chemistry

Catalytic cracking is an industrial process used to convert high-molecular-mass hydrocarbons to low-molecular-mass hydrocarbons. A petroleum company has a huge supply of heating oil stored as straight chain C17H36, and demand has picked up for shorter

75. ## johnglenn

Discuss some of the advantages to having a cycle that partially replenishes itself. In the Calvin cycle, what would happen to the cycle if there was no carbon dioxide available

76. ## phyics

An object in simple harmonic motion has an amplitude of 0.202 m and an oscillation period of 0.620 s. Determine the maximum speed of the motion

77. ## physics

Two cars both start from rest and have the same constant acceleration. When radar is used to measure the velocity of each car, car A is found to be moving twice as fast as car B. At the instant the radar is used, car A has a displacement that is ______

78. ## PHYSICS

A circular curve of highway with radius 200m is designed for traffic moving at 100km/h, and is banked so that cars can make the curve even without friction at that speed. What is the correct angle of banking for this curve? Show steps, please.

79. ## Physics!!

A 4.9 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.81 m/s2 . If the upward acceleration of the bucket is 3.3 m/s2, find the force exerted by the rope on the bucket of water. Answer in units of N.

Jack went to the store to buy eggs. He thought "i ned enough eggs to last me all week. I eat two eggs for breakfast each day and i need six eggs to give back to my neighbor because i borrowed some." When Jack asked the store clerk for his eggs, he was told

81. ## mathemarics

Given the point m(-3,-4) is the midpoint of XY and that X(7,4)answer the following ; A Find the coordinates of Y . B Find the distance between X and Y ?

82. ## Chemistry

A 0.200 g sample of carbon dioxide, CO2, has a volume of 525 mL and a pressure of 473 mmHg . What is the temperature of the gas in kelvins?

83. ## physics

A bicycle wheel has a diameter of 57.7 cm and a mass of 2.66 kg. The bicycle is placed on a stationary stand and a resistive force of 156 N is applied tangent to the rim of the tire. Assume that the wheel is a hoop with all of the mass concentrated on the

84. ## Physics

Florence who weighs 120lb stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is accelerating upward at 4.0 m/s^2 a) 120lb b) 135lb 3) 105lb d) 90lb

85. ## Economics

A nations capital goods wear out over time, so a portion of it's capital goods become unusable every year. Last year, its residents decided to produce no capital goods, It has experienced no growth in its population or in the amounts of other productive

86. ## Social Studies

I have to write a poem about life in Carribien South America today. But the problem is I can't find any good sources and credible sources, and even if I did have some I don't know how to start writing a poem. Could you give me some sources for it, and an

87. ## Physics

A 1 kg mass attached to a 1 m string is rolled around in a horizontal circular path with an angular velocity of 100 RPM what is the tension of the string? Please show how you got your answer.

88. ## Physical

A motor car travelling at 14m/s on dry flat surface should be able to stop in 14m.Assuming the deceleration to be uniform. Given: its value and the corresponding bracking time is -7m/s^2 , 2 sec Calculate the distance travelled during the first second

89. ## physics helpppp!!

The 2nd harmonic of a string of length 40cm and linear mass density 1.11g.m has the same frequency as the 5th resonance mode of a closed pipe of length 1.4m. Find the tension in the string. use 340 for speed of sound

90. ## analytic geometry

fin the center ,principal axis vertices, sketch the graph of 4x^-y^2 +56 x +2y+195=0

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2,

92. ## english (gurublue or anyone)

I'm stumped on what seems to be a fairly easy question that has been asked of me after reading about "Mike Rose". I will summarize the story and provide the question that has given me the mental block. Simple story... Mike Rose as a kid didn't do well in

93. ## Pre Calculus

A piece of cardboard measuring 13 inches by 11 inches is formed into an open-top box by cutting squares with side length x from each corner and folding up the sides. a. Find a formula for the volume of the box in terms of x b. Find the value for x that

94. ## Physics

A 250g wood block firmly attached to a horizontal spring slides along a table with a coefficient of friction of 0.40. A force of 30.N compresses the spring 20cm. If the spring is released from this position what will be the block's speed when it passes

95. ## math

express each answer in exponential form using the indicated bases 4x4x4x4,base 2

96. ## English

How do these develop theme of these allusions from Hamlet? 1. "I would have such a fellow whipped for o'erdoing Termagant" (II,ii,14) So basically Hamlet is telling his actors not over act during the play. 2. “For O, For O, the hobbyhorse is forgot”

97. ## Math

Juan bought 2 tires for his bike. His bike cost \$65. How much did he spend on the 2 tires?

98. ## Math (Fraction Word Problem)

You have three-fifths of a pizza leftover, and you plan to eat half of it for lunch. How much of the original pizza do you have left over? If I have 3/5 of a pizza leftover and I plan to eat 1/2 of it for lunch doesn't that mean you have to divide? This is

99. ## Physics

An object with a net charge of 20 µC is placed in a uniform electric field of 627 N/C, directed vertically. What is the mass of the object if it floats in the electric field?