jeff

Most popular questions and responses by jeff

In American society, romantic love is considered the main reason for people to marry. On the other hand, in some societies, romantic love is considered a form of obsession or madness. In fact, even in many societies where "true love" is not considered a

2. physics

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.10s later. What was the rocket's acceleration?

3. Math Algebra

The coordinates of quadrilateral VXY Are given below. Find the coordinates of its image after a dilation with the given scale factor V(6, 2), W(-2, 4), X(-3, -2), Y(3, -5) scale factor of 2 This question is confusing me and is worth 3 points please help :)

4. language arts

what are some examples of benign foods

5. Operations Management

Joe Henry's machine shop uses 2,500 brackets during the course of a year. These brackets are purchased from a supplier 90 miles away. the following information is known about the brackets. annual demand 2,500 holding cost per bracket per year \$1.50 order

Using the numbers 5, 8, and 24, create a problem using no more than four operations (addition, subtraction, multiplication, division, square, square root, cube, cube root) where the solution will be an irrational number. Explain why the result of your

7. Microeconomics

Four roommates are planning to spend the weekend in their dorm room watching old movies, and they are debating how many to watch. Here is their willingness to pay for each film: Orson Alfred Woody Ingmar Frist film 7 5 3 2 Second film 6 4 2 1 Third film 5

8. English

Which type of figurative language is found in lines 6 and 7? (1 point) symbol metaphor personification* (my awnsor) simile What can you conclude from the figurative language you identified in the previous question? (1 point) The flowers’ smell was too

9. Physics

Two airplanes leave an airport at the same time. The velocity of the first airplane is 730 m/h at a heading of 44.6 degrees. The velocity of the second is 610 m/h at a heading of 100 degrees. How far apart are they after 2.3 h? Answer in units of m.

10. HISTORY

To rule his empire successfully, Hammurabi instructed his own governors A to teach local rulers B to rule distant cities C to train his sons to rule. B to cut off communication with the outside world

11. Math-probabilities

The table below shows the number of deaths in the U.S. in a year due to a variety of causes. For these questions, assume these values are not changing from year to year, and that the population of the United States is 312 million people. Cause Deaths

A right triangle has an area of 24 ft^2 the dimensions of the triangle are increased by a scale factor of 6 A.48ft^2 B.72ft^2 C.144ft^2 D.864ft^2

13. calculus

7. A cardboard box manufacturer wishes to make open boxes from rectangular pieces of cardboard with dimensions 40 cm by 60 cm by cutting equal squares from the four corners and turning up the sides. Find the length of the side of the cut-out square so that

Jamie is a salesperson in a shoe store and earns \$95 per week, plus 20% of her weekly sales. If Jamie makes \$475 in one week, what are her sales for that week?

15. algebra

Andrea is making a sandbox.She has made a wooden frame in her backyard that is 6 feet long, 6 feet wide, and 2 feet deep. She can purchase sand for \$30 per cubic meter. How much will it cost for her to purchase sand? Hint: 1 foot equals 0.3048 meters.

16. Chemistry

Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after the following volumes of HNO3 have been added. a)0.0 mL b)20.0 mL c)25.0 mL d)40.0 mL e)50.0 mL f)100.0 mL

17. spanish

Help with spanish!!!! Have to put correct words in the banks. 2 of them will not be used.? Querida Beth: 1) (blank) esta todo bien y esperamos que 2) (blank) tambien lo este. 3) (blank) lo pensemos y lo conversemos, tu padre y yo no estamos contentos con

18. math

Sara drives 72 miles on 3.2 gallons of gas. She uses this information to calculate how many miles per gallon she can drive. Using this result, how many miles can Sara drive on 13.3 gallons of gas?

Chris and five of his friends go out to dinner. The total bill comes to \$124.29. They decide to leave a 20% tip. Each person will contribute an equal amount to the total tip. Estimate what each person should contribute. a\$29.00 b\$21.00 c\$5.00 \$4.15

20. College Physics

The only force acting on a 3.9 kg body as it moves along the positive x axis has an x component Fx = - 6x N, where x is in meters. The velocity of the body at x = 3.0 m is 8.0 m/s. (a) What is the velocity of the body at x = 4.0 m? (b) At what positive

21. Physics

An arrow is shot from a height of 1.5 m toward a cliff of height . It is shot with a velocity of 30 m/s at an angle of 60 deg above the horizontal. It lands on the top edge of the cliff 4.0 s later. (a) What is the height of the cliff? (b) What is the

22. AP Physics

15. A 3.0 kg block is pushed 3.0 m at a constant velocity up a vertical wall by a constant force applied at an angle of 30.0 with the horizontal, as shown in the figure. The acceleration of gravity is 9.81 m/s2. If the coefficient of kinetic friction

The area of a circle is 28.26 square centimeters. What is its diameter (use 3.14 for ð)?

24. math

A spring is attached to the ceiling and pulled 12 cm down from equilibrium and released. The amplitude decreases by 17% each second. The spring oscillates 16 times each second. Find an equation for the distance, D the end of the spring is below equilibrium

25. Organic Chemistry

How am I supposed to do these questions? I'm completely lost. A 0.120 M solution of an enantiomerically pure chiral compound D has an observed rotation of 0.12° in a 1-dm sample container. The molar mass of the compound is 130.0 g/mol. (b) What is the

26. Physics

Police find skid marks 60 m long on a road showing where a car made an emergency stop. Assuming that the deceleration was -10m/s2, how fast was the car going?

27. chemistry

A galvanic cell has an iron electrode in contact with 0.20 M FeSO4 and a copper electrode in contact with a CuSO4 solution. If the measured cell potential at 25 degrees Celcius is 0.61 V , what is the concentration of Cu2+ in the CuSO4 solution?

28. Science Help

4. When a fan is turned on, it changes electrical energy into ______ energy. A. motion*** B. magnetic C. gravitational D. electromagnet HELP ME

29. physics

Storms in the South Pacific can create waves that travel all the way to the California coast, which are 12,000 km away. How long does it take them if they travel at 15.0 m/s?

30. Algebra

I am getting ready to start an Algebra class for the first time and I was wondering what challenges people have with learning and using algebra concepts. Also what are the best ways to over come math anxiety? The best way? Learn the language of algebra.

31. geography

larger land area- california or missouri?

32. trig

solve equation for the exact solutions if possible put answer in degrees. 2tanx/3-tan^2x=1

33. Physics

The x component of vector is 5.3 units, and its y component is -2.3 units. The angle that vector makes with the +x-axis is closest to

34. Chemistry

In alcohol fermentation, yeast converts glucose to ethanol and carbon dioxide C6H1206 -----> 2C2H5OH + 2CO2 If 5.97 g of clucose are reacted and 1.44 L of CO2 gas are collected at 293 K and .984 atm, what is the percent yield of the reaction?

35. Physics

Charge A has a charge of +2 C. Charge B has a charge of - 3 C and is located 1 meter to the right of A. Charge C is located 1 m to the right of charge Band has a charge of -1C. If a fourth charge (Charge D) is placed 4 m to the right of Charge B, How much

36. chemistry

A sample of hydrogen gas was collected over water at 36°C and 855 mmHg. The volume of the container was 6.50 L. Calculate the number of moles of H2 collected. (Vapor pressure of water is 44.6 torr at 36°C)

37. Physics

Two events that are simultaneous in one frame of reference will be: A) simultaneous in all frames of reference B) simultaneous in another frame that is moving in the opposite direction C) simultaneous in another frame of reference that is moving in the

38. Calculus

The rate at which water flows into a tank, in gallons per hour, is given by a differentiable, increasing function R of time t. The table below gives the rate as measured at various times in an 8-hour time period. t (hours) 0 2 3 7 8 R(t) (gallons per hour)

39. Science

Dust mites are microscopic bugs that are too small to see with a dissecting microscope. To see the details of a dust mite’s skin, which of the following microscopes would you use? A. dissecting microscope B. compound microscope C. transmission electron

40. math

Carlos hiked 1 and 3/4 miles along a nature trail to a fork in the trial. He than hiked 2 and 1/2 along a path that led to a waterfall. When carlos reached the waterfall, how far had he hiked altogether?

41. chemistry

6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?

42. Math

A manufacture has been selling 1400 television sets a week at \$450 each. A market survey indicates that for each \$14 rebate offered to a buyer, the number of sets sold will increase by 140 per week. a) Find the function representing the demand p(x) , where

43. trigonometry

the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65^ and 40^ respectively. Find the two legs

44. math statistics

create a null hypothesis on these research questions: a. what are the differences between emergency room shifts on medication errors? b. On a clinical trial of a new drug what will be the effects over a currently used drug?

45. Math

In how many ways committee of 4 people can be chosen if there are 10 men and 6 women and we require that we need 3 men and 1 woman be in committee?

46. Computers

Develop a use case diagram for a department store credit card system. Include at least two actors and four use cases.

47. Chem

Calculate ΔG∘ at 298 K for the following reactions. A) Ca(s)+CO2(g)+12O2(g)→CaCO3(s) B) 2KClO3(s)→2KCl(s)+3O2(g) C) CO(g)+H2O(g)→H2(g)+CO2(g)

48. Physics

A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. (C is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged

49. Chemistry

Nickel carbonyl has a formula: Ni(CO)4. Nickel carbonyl is produced by the reaction of solid nickel metal with carbon monoxide gas. 1. how do you write a balanced equation for this reaction? 2. How many liters of carbon monoxide gas must be provided to

50. math

Wilcorp has 50 employees who work 40 hours a week and earn \$20/hour. Fifteen employees each worked 4 hours of overtime at 50% above their hourly rate.

51. physics

Which of the following equations is dimensionally consistent? A. a3 = 1.2 (v/t)3 + 0.2 x3/t6 + 1.5 v4/x3 B. a3 = 1.2 (v/t)3 + 0.2 x2/t6 +3 v6/x3 C. a3 = 1.2 (v/t)3 + 0.2 x3/t6 - 1.5 v6/x3 D. a3 = 1.5 (v/t)2 + 0.2 x3/t6 - 1.5 v6/x3

52. calculus-differential equation

Consider the differential equation: (du/dt)=-u^2(t^3-t) a) Find the general solution to the above differential equation. (Write the answer in a form such that its numerator is 1 and its integration constant is C). u=? b) Find the particular solution of the

The answer to this question IS NOT "B". What is the answer to the following question. Inside the bus, in his summer Class-A uniform with its brass glitter and infantry-blue shoulder cordon, Jamie Sabin was going home. Fort Benning would be a fading dream;

54. Science help URGENT

Muscles located in the walls of the small intestine help push digested material along. Muscles located in the walls of arteries help push blood along. Based on this information and your understanding of muscle types, which of the following statements is

55. Chemistry

Consider the following reaction at constant P. Use the information here to determine the value of ΔSsurr at 398 K. Predict whether or not this reaction will be spontaneous at this temperature. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g); ΔH = -1267 kJ

56. calculus

The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 50t - 2t2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?

1. What is the product of (5.1 × 10^3) • (3.2 × 10^3)? (1 point) 16.32 × 10^6 1.632 × 10^7 16.32 × 10^9 1.632 × 10^10 2. What is the product of (7.28 × 10^-2) • (9.1 × 10^-2)? (1 point) 6.6248 × 10^-3 66.248 × 10^-4 6.6248 × 10^4 66.248 ×

58. Physics

A 0.62-mm-diameter copper wire carries a tiny current of 2.0 μA . The molar mass of copper is 63.5 g/mole and its density is 8900 kg/m3. NA=6.02×1023

59. Trig

Simplify: (cosx + cos2x + cos3x + cos4x + cos5x + cos6x) / (sinx + sin2x + sin3x + sin4x + sin5x + sin6x) into a single Cotangent function. Using the sum-to-products, I was able to get remove some of the addition in attempts to get full multiplication, but

60. chemistry

Greg reacts 5.0 moles of hydrochloric acid(HCL)with 1.5 moles of barium hydroxide(Ba(OH)2).Which reagent is the limiting reagent, and which is in excess?If the reagent runs to completion,how many moles of barium chloride(BaCl2)will be produced? CAN SOMEONE

61. physics

An arrow with a mass of 0.12 kg is pulled back in a bow. After being held still, it is let go, moving at 23m/s after the 0.51meters in which the arrow is in contact with the bow string? What work was done on the arrow by th bow string? What force was

62. science

An athlete throws a basketball through a hoop. The ball leaves his hands at a height of 2.5 m with a speed of 9.0 m/s. Calculate the speed of the ball when it “swishes” through the hoop. The hoop is at a height of 3.0 m and it is 5.0 m along the court

63. Physics

A 0.62-mm-diameter copper wire carries a tiny current of 2.0 μA . The molar mass of copper is 63.5 g/mole and its density is 8900 kg/m3. NA=6.02×1023 Estimate the electron drift velocity. Assume one free electron per atom.

64. Math - Ratio

A map scale is 1:10,000. Find the actual distance in centimetres represented on a map by 5cm. Convert your answer to metres and kilometres.

65. calculus

A ball of radius 10 has a round hole of radius 5 drilled through its center. Find the volume of the resulting solid.

66. Electrochemistry

Is it possible to separate platinum, palladium, and iridium as chloro-complex ions from an HCl solution through electrolysis if the solution is a constant 1.0 molarity in chloride ions and 0.020 molarity in each complex ion? The E values for the half

67. History

Upton Sinclair was a well-known muckraker who spent several months investigating the working conditions of the Chicago, Illinois, meatpacking industry. His findings became the basis of his 1906 serialized novel The Jungle. This book gave a fictionalized

68. Math

A triangle has an angle that measures 26°. The other two angles are in a ratio of 5:6. What are the measures of those two angles?

69. Physics

A 0.500 kg object is thrown vertically upward with an average applied force of 8.20 N by a student. The force is applied through a displacement of 1.50m. a. What is the average net force acting on the object? b. What is the velocity of the object when it

70. Science plz?

Identify the process that is necessary for sexual reproduction, explain why it is necessary, and identify how this process increases genetic variation.

71. calculus

A flag pole is 40 feet high and stands on level ground. a flag is attached to a 120 foot rope passing through a pulley at the top of the flagpole. The other end of the rope is tied to a car at ground level. If car was driving directly away from flagpole at

72. Physics

A gun is fired vertically into a 1.60 kg block of wood at rest directly above it. If the bullet has a mass of 21.0 g and a speed of 195 m/s, how high will the block rise into the air after the bullet becomes embedded in it?

73. chemistry

How many grams of oxygen are required to react with 0.128 lead(II) sulfide?

74. Math

Jeff is changing the shape of his sandbox from 10 feet long by 12 feet wide to a square that has the same area. What is the perimeter of the square sandbox, rounded to the nearest hundredth?

75. social studies

In the years after World War II, which of the following caused many people from Asian and African countries to migrate to Europe? A. the end of the Soviet Union B. new economic opportunities after colonialism ended C. the religious freedom found in Europe

76. Science? Help

Summarize the steps of sexual reproduction and explain how it increases genetic diversity.

77. Algebra Help

8x – 3 = 15x + 18 x = –3 x = 3 x = 2.1 x = .9 Can you show how you did it please?

78. Physics

A ballistic pendulum was a device used in the past century to measure the speed of bullets. The pendulum consists of a large block of wood suspended from long wires. Initially, the pendulum is at rest. The bullet strikes the block horizontally and remains

79. physics

The driver of a car traveling at 60 ft/sec suddenly applies the brakes. The position of the car is s(t) = 50t - 2t2, t seconds after the driver applies the brakes. How many seconds after the driver applies the brakes does the car come to a stop?

80. Statistics

A sociologist is interested in the relations between x = number of job changes and y = annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information. x

81. CHEMISTRY

Explain why it is quantitatively not acceptable to titrate each of the vinegar samples with the NaOH titrant to the same dark pink endpoint?

82. science

When water mixes with carbon dioxide in the air, what is formed? H2O + CO2 --> H2CO3 carbonic acid I don't think this is correct because there is no aid in co2. It just ends up to be CO2 in liquid form. Basically water with air is carbonated water. that is

83. chemistry

net ionic equation for reaction between copper carbonate and the hydroiodic acid

84. Math

A licence plate starts with 3 letters. If possible letters are M, N, P, Q, R, S, T. How many different permutation of these letters can be made if no letter used more than once.

85. statistics

how can you reword these research hypotheses to null hypotheses: a. smoking during pregnancy increases the risk of a child being born prematurely. b. regular exercise in older adults decreases blood pressure levels.

86. history

How was the art of Mesopotamia different from that of earlier cultures? A. It included monuments that glorified the gods and showed religion in society. ** my answer B. It included pretend animals and showed human imagination. C. They showed people in

87. Physics HELP

You have two containers half full with liquid 1. You then fill the two containers respectively with a layer of liquid 2 and 3. A ray of light travelling through the bottom layer (liquid 1) and into the top layer experiences total internal reflection off

88. CHEMISTRY

DRAW LEWIS, KEKULE AND SKELETAL STRUCTURE OF: (CH3)2NCH2CH3

89. physics

A children's merry-go-round in a park consists of a uniform 200kg disk rotating about a vertical axis. the radius of the disk is 6 m and a 100kg man is standing on the outer edge when the disk is rotating at a speed of 0.20rev/s. how fast will the disk be

90. Physics HELP

In a downtown office building you notice that each of the four sections of a rotating door has a mass of 90 kg. What is the width of each section of the door if a force of 58 N applied to the outer edge of a section produces an angular acceleration of

91. Chemistry

Is it possible to separate platinum, palladium, and iridium as chloro-complex ions from an HCl solution through electrolysis if the solution is a constant 1.0 molarity in chloride ions and 0.020 molarity in each complex ion?

92. physics

Two stars X and Y travel counterclockwise in circular orbits about a galaxy. The radii of their orbits are in the ratio 4:1 . At some time, they are aligned making a straight line with the center of the galaxy. Five years later, star X has rotated through

93. Physics

A 3.0cm diameter crankshaft that is rotating at 2500 rpm comesto a halt in 1.5 s. a- what is the tangential acceleration of a ponit on thesurface? b-how many revolutions does the crankshaft make as itstops? For this question, what are the applicable

94. physics

A charge of -4.50 10-6 C is placed at a point in space where the electric field is directed toward the right and has a magnitude of 9.00 104 N/C. What are the magnitude and direction of the electrostatic force on this charge?

95. Science

What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?

96. chemistry

A sealed flask contains 0.40 g of water at 28 deg. celsius. The vapor pressure of water at this temperature is 28.36 mmHg

97. Chem1C

What is the pH of a 0.050M triethylamine, (C2H5)3N, solution? Kb for triethylamine is 5.3 x 10^-4 I have no idea how to start this, thanks.

98. Physics

What is the magnitude of the electric field at a point midway between a −8.3μC and a +5.4μC charge 10cm apart? Assume no other charges are nearby.