Popular questions and responses by amelia
  1. Physics

    An inventive child named Chris wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, Chris pulls on the loose end of the rope with such a force that the spring scale

    asked on October 22, 2012
  2. English

    Read the following sentences from "The Swimming Contest" "Who the hell fired that shot?" "My gun went off," one of the boys said. When he saw me coming up the officer said, "We've lost that information, damn it! They've killed that Arab of yours" "We've

    asked on June 3, 2017
  3. Algebra

    If a building contractor hires 5day laborers and 1 concrete finisher his payroll for the day is $935 if he hires 1day laborer and 4 concrete finishers his daily cost is $833 find the daily wage for each type of worker solve the problem using matrix

    asked on June 21, 2020
  4. Physics

    The Moon's period of revolution around the Earth is 27.3 d. How far away is the moon?

    asked on November 22, 2009
  5. physics

    (a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each. 1 cm (frequency = 900 MHz) 2 cm (frequency = 2560 MHz) (b) Which frequency would produce smaller hot spots in foods due to

    asked on May 29, 2012
  6. physics

    When serving a tennis ball, the player hits it when its velocity is zero (at the highest point of a vertical toss). The racket exerts a force of 560 N on the ball for 5.00 ms, giving it a final velocity of 45.0 m/s. Using these data, find the mass of the

    asked on December 19, 2011
  7. business

    What jobs require a helmet? I think construction workers hockey players but I cant think of anything else. Plz help me ASAP plz! Thank you !

    asked on May 7, 2015
  8. Math

    A scuba diver dives to a depth of 50 feet, then rises 15 feet, sinks 12 feet, then rises 20 feet. Write an expression to describe this situation. Then solve it.

    asked on September 3, 2015
  9. physics

    TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, as shown in Figure 23.24. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas

    asked on May 29, 2012
  10. physics

    During a workout, the football players at State U. ran up the stadium stairs in 61 s. The stairs are 145 m long and inclined at an angle of 30°. If a typical player has a mass of 105 kg, estimate the average power output on the way up. Ignore friction and

    asked on April 10, 2012
  11. science

    The gravitational force between two objects in space is 800 million newtons. If the distance between them is doubled, what size will the gravitational force be (in millions of newtons)?

    asked on April 3, 2019
  12. Chemistry

    How many electron domains are around the central atom ina water molecule?

    asked on November 7, 2017
  13. physics

    A curved road is banked at an angle such that friction is not necessary for a car to stay on the road. a 2500 kg car is traveling at a speed of 25 ms and the road has a radius of curvature equal to 40 m. calculate the magnitude of force that the road

    asked on October 4, 2015
  14. Physics

    007 (part 1 of 2) An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N 008 (part 2 of 2) If the same elevator

    asked on October 22, 2012
  15. physics

    A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.92 but its wrong?

    asked on May 14, 2012
  16. Physics

    Hi guys, would appreciate some help with this problem: When a light turns green, a car speeds up from rest to 50.0 mi/h with a constant acceleration of 8.80 mi/h·s. In the next bike lane, a cyclist speeds up from rest to 20.0 mi/h with a constant

    asked on October 9, 2008
  17. History

    What led to conflict in Bosnia between the Bosniaks and Serbians? A. Free elections in Bosnia promoted a Serbian Revolution that sought to rid the region of Bosniaks through mass deportation. B. Military buildup of the Bosnian Liberation Front saw a coup

    asked on February 13, 2019
  18. Chemistry

    Bromine and chlorine gas react to give bromine monochloride (BrCl) according to Br2(g)+Cl2(g)⇌2BrCl(g) Given initial concentrations [Br2]=1.50 mol L-1, [Cl2]=0.90 mol L-1 and [BrCl]=0 and K=7 determine (to two decimal places) the equilibrium

    asked on February 26, 2018
  19. physics

    A wave traveling along the x axis is described mathematically by the equation y = 0.17sin(8.5πt + 0.45πx), where y is the displacement (in meters), t is in seconds, and x is in meters. What is the speed of the wave?

    asked on January 27, 2018
  20. physics

    Traveling at a speed of 18.0 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.690. What is the speed of the automobile after 1.29 s have elapsed?

    asked on October 15, 2017
  21. Math

    You pay 3.3 cents per minute for long-distance phone calls on your phone. Your phone bill is $3.40. Write and solve an equation to find the number of minutes m of long-distance calls you made. A. ; 103 minutes B. ; 11 minutes C. ; 83 minutes D. ; 10

    asked on April 23, 2014
  22. College Algebra

    A projectile is thrown upward with an initial velocity of 272 feet per second. After t seconds, its height h(t)above the ground is given by the function : h(t)=-16t^2+272t. a. Determine the projectile's maximum height. b. Determine how long it takes the

    asked on February 18, 2012
  23. physics

    A constant friction force of 15 N acts on a 70 kg skier for 20 s. What is the skier's change in velocity?

    asked on December 19, 2011
  24. Business Math

    A furniture store sells recliners at a 70% mark-up (based on price). If the recliner costs the store $240, what price will they charge? Formula: %Markup on cost=%markup on selling price/100% - % markup on selling price x = 70%/100%-70% x = 70%/30% x =

    asked on December 8, 2009
  25. Physics

    A person pushes on a 62-kg refrigerator with a horizontal force of -280 N; the minus sign indicates that the force points in the -x direction. The coefficient of static friction is 0.70. (a) If the refrigerator does not move, what are the magnitude and

    asked on October 15, 2017
  26. math

    Let f(x) = x^2+7 and g(x) = x+ 3 / x. Find (g (circle) f) (-5) a.) 35/12 b.) 35/32 c.) 32/35 d.) 11/25 I think it is a.

    asked on June 9, 2017

    A 15 g bullet strikes and embeds in a 2.1 kg block suspended at the end of a 1.2 m string. After the collision the string rises to a maximum angle of 22 degrees to the vertical. what is the speed of bullet? what I did MASS OF BULLET = 0.015 KG i found the

    asked on April 20, 2016
  28. chemistry

    at a temperature of 5 celsius, 21.5 mg of a non electrolyte is dissolved in enough water to make a 150.0 ml solution. the osmotic pressure of the solution is 0.200 atm. what is the molar mass of the substance dissolved

    asked on September 8, 2014
  29. science-please help due first thing tommorw

    the same alkali(sodium hydroxide)can be found in both hair gel and oven cleaner.explain why it is safe to put hair gel on your skin, but not on oven cleaner. plz help!Be as acurate as possible and it has to be an outstanding scientific explanation.

    asked on November 8, 2012
  30. math

    Is -4.17 rational or irrational and is 3.24037 rational or irrational and how can you tell the difference between them?

    asked on May 20, 2020
  31. Math

    Turn the recursive function into its equivalent explicit function: f(1) = 18; f(n) = f(n - 1) + 6; n is be greater than or equal to 2* How would I solve this? Any help is appreciated! Thanks! *The symbol for that is the > with a line under it, I couldn't

    asked on March 9, 2019
  32. Maths

    Evaluate the expression √−7/√ −6√−5 and write the result in the form a+bi. I keep getting b as 0.483i but apparently its wrong?

    asked on February 14, 2018
  33. Math

    A lawn is 3 m by 5 m there is a path 1 m wide laid around the lawn. Find the area of the lawn (Please help)

    asked on October 15, 2016
  34. Calculus (30min before deadline help pls )

    A street light is at the top of a 16 ft pole. A 5 ft tall girl walks along a straight path away from the pole with a speed of 3 ft/sec. At what rate is the tip of her shadow moving away from the light (ie. away from the top of the pole) when the girl is 36

    asked on April 9, 2016
  35. geometry

    Hello , my name is Amelia and my daughter is really confused on her homework about quadrilaterals. Can you help explain it to her so that she can understand it better? Please answer ASAP. Thank you Amelia V.

    asked on May 7, 2015
  36. chem

    Determine the equilibrium constant for the following reaction. 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq)

    asked on June 21, 2013
  37. Physics

    Suppose a distant world with surface gravity of 7.12 m/s2 has an atmospheric pressure of 7.48 104 Pa at the surface. (a) What force is exerted by the atmosphere on a disk-shaped region 2.00 m in radius at the surface of a methane ocean?________N (b) What

    asked on November 7, 2012
  38. Math

    assume 8 males audition, one of them being Miles, 6 females audition, one of them being Jackie, and 4 children audition. The casting director has 3 male roles available, 1 female role available, and 2 child roles available. How many different ways can

    asked on September 10, 2012
  39. physics

    A steam iron draws 6.5 A when connected to a potential difference of 120 V. (a) What is the power rating of this iron? 1 W (b) How many joules of energy are produced in 20.0 min? 2 J (c) How much does it cost to run the iron for 20.0 min at $0.014/kW·h? $

    asked on May 14, 2012
  40. Math

    I'm not sure how to do this question 7. The growth of bacteria in culture can be described by the equation N1 = N0e' where N is the number of bactena at any time t, No is the initial number of bacteria, and k is a constant. The time taken for growth to

    asked on December 15, 2009
  41. Business Math

    A furniture store sells recliners at a 70% mark-up (based on price). If the recliner costs the store $240, what price will they charge?

    asked on December 8, 2009
  42. 4th grade

    I have to find the product of 22x11 using an array. Draw a rectangle 22 units long by 11 units wide. Divide the rectangle by tens and ones for each factor. Then complete the calculation.

    asked on November 3, 2009
  43. amino acids

    with amino acid ionisation staes do the r groups/side chains deprotonate first or the nh3+ group im talking about aspartic acid if that's relevant Thank you

    asked on November 3, 2009
  44. math

    differentiate from first principles 2x^3 -5 (f(x+h)-f(x))/h i know what it should be but i keep going wrong somewhere thanks

    asked on October 29, 2009
  45. 9th grade

    wats the meaning of tone... for art?

    asked on August 25, 2008
  46. math

    the tap in the health room drips 1 ml of water every 15 seconds. how many milliliters does the tap drip every minute?

    asked on April 10, 2020
  47. Freshman Success

    True or False: If you take a course and do not pass it, you still get the credit.

    asked on February 26, 2020
  48. English

    Can someone check my answer please? Read the following sentences from "Marriage is a Private Affair." ""I owe it to you, my son, as a duty to show what is right and what is wrong. Whoever put this idea into your head might as well have cut your throat. It

    asked on January 14, 2020
  49. algebra

    A town clock has a minute hand that is 1.5 meters long and an hour hand that is 1.2 meters long. What is the approximate distance in meters between the ends of the hands at 9 o'clock? 2.3 1.9 0.9 0.3 can someone get me the answer? thanks

    asked on October 29, 2019
  50. Math

    please check all of my answer and tell me if they are wrong along with how to fix them. Also, I need to know numbers 10, 8, 6, 2,3,1

    asked on April 22, 2019
  51. Algebra

    (Note): Hello! I am really stuck on this problem and am trying to figure out how to solve it! I don't want the answer, I just want to know how to solve an equation like this: Consider a sequence whose first five terms are: -1.75, -0.5, 0.75, 2, 3.25 Which

    asked on March 12, 2019
  52. Science

    A scientist goes to a large international conference and hears about a new discovery. The scientist is very excited about these new findings and decides to verify the other scientists' results by conducting her own investigations. The scientist is being

    asked on February 19, 2019
  53. English

    Compare and contrast your Independent Reading selection with one or two other selections you have read in this unit. Support your response with at least two pieces of evidence from your Independent Reading selection Be sure to give the title and author of

    asked on February 19, 2019
  54. English

    At the end of her aunt's story in The Story-Teller," the older girl asks whether the girl in the story would have been rescued even if she had not been good. What does she seem to think is the theme of her aunt's story? What detail in the aunt's story

    asked on February 16, 2019
  55. Pre algebra

    Given a long algebraic equation, what are some strategies that you can use to make simplifying and evaluating the equation more efficient and accurate? How do inverse operations help solve algebraic equations? Give a real-world scenario where this might be

    asked on February 4, 2019
  56. Physics

    A charge of -6.17 μC is traveling at a speed of 5.47 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 53.2o. A force of magnitude5.37 × 10-3 N acts on the charge. What is the

    asked on March 11, 2018
  57. Physics

    A microphone is attached to a spring that is suspended from the ceiling, as the drawing indicates. Directly below on the floor is a stationary 624-Hz source of sound. The microphone vibrates up and down in simple harmonic motion with a period of 2.31 s.

    asked on February 1, 2018
  58. Physics

    Calculate the change of volume that occure when a steel bearing with an initial volume of 1.8cm^3 is heated from 20°C to 80°C. Tried to use the formula DeltaV/Vinitial=Beta×DeltaT but kept getting the wrong answer though my maths could be off?

    asked on December 5, 2017
  59. Math

    Suppose C and D are 2 × 2 matrices with det(C) = −3 and det(D) = 2. Find the determinant of the matrices 8C^3D2 and 5 C^-1

    asked on December 3, 2017
  60. Physics

    A train, with an initial velocity of 35ms^-1 along a straight track, deccelerates at a constant 0.25ms^2. Determine how far it travels in 2 minutes.

    asked on November 28, 2017
  61. Physics

    The wheels, axle, and handles of a wheelbarrow weigh W = 67 N. The load chamber and its contents weigh WL = 511 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a

    asked on November 13, 2017
  62. Physics

    A 7.40-kg block is placed on top of a 12.5-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.610. What is the maximum horizontal force that can be applied before the 7.40-kg block begins to slip

    asked on October 23, 2017
  63. Physics

    A satellite has a mass of 5823 kg and is in a circular orbit 4.45 × 105 m above the surface of a planet. The period of the orbit is 1.9 hours. The radius of the planet is 4.57 × 106 m. What would be the true weight of the satellite if it were at rest on

    asked on October 23, 2017
  64. Physics

    At a time when mining asteroids has become feasible, astronauts have connected a line between their 3830-kg space tug and a 5930-kg asteroid. They pull on the asteroid with a force of 671 N. Initially the tug and the asteroid are at rest, 514 m apart. How

    asked on October 9, 2017
  65. MATH


    asked on September 2, 2017
  66. Science

    Explain why n2h4 acts as bronsted lowry base but n20 does not

    asked on November 6, 2016
  67. Maths

    A swimming pool is being emptied and the amount of water remaining in the pool after t minutes after emoting commences is given by: Time t (min) Volume V (L) 0 30000 20 28800 40 25200 60 19200 80 10800 Find the equation describing the volume of water

    asked on October 30, 2016
  68. homework help: social studies

    Why were colonial minutemen so prepared for the arrival of the British in Concord? (Worth 2 points) When Washington saw the British, he fired three cannon shots sending a warning sign Paul Revere had warned villages that the redcoats were coming The Green

    asked on August 31, 2016
  69. Pre Calculus

    Determine the quadrant in which a 130° angle lies. a. 4th quadrant b. 1st quadrant c. 3rd quadrant d. 2nd quadrant

    asked on July 9, 2016
  70. Pre Calculus

    Determine the quadrant in which an angle, θ, lies if θ = 5.40 radians. a. 4th quadrant b. 3rd quadrant c. 2nd quadrant d. 1st quadrant

    asked on July 9, 2016
  71. Pre Calculus

    Determine the quadrant in which an angle, θ, lies if θ = 8π / 7 a. 3rd quadrant b. 1st quadrant c. 4th quadrant d. 2nd quadrant

    asked on July 9, 2016
  72. math (significant digits)

    (3.x10^-2) + (0.2) round to significant digits required

    asked on June 10, 2016
  73. chemistry

    What is the difference between molecular compounds, covalent compounds and covalent bounds

    asked on June 8, 2016
  74. Calculus question ?

    Are there any horizontal asymptote on a ln natural log function

    asked on May 17, 2016

    lim (cubic root (7+x^2-8x^3)/(x^3-x+pi)) x--> +inf I don't know how to take the limit when there is a cubic root around . Between the ansswer is + inf . I need direction

    asked on May 17, 2016
  76. calculus question ?

    I just can't wrap my head around this. I don't know if this is true I just came to conclusion with this if the limit of x--> +/-inf = L (if the limit of x going to pos/neg infinity gives you a number L) does that mean that L is a horizontal asymptote ? if

    asked on May 14, 2016
  77. physicss

    1) Is it possible for the net torque to be opposite the direction of angular velocity 2) Can momentum be conserved if mechanical energy is not conserved?

    asked on May 12, 2016
  78. English synonym

    I am writing an essay Do you guys know a word that is more powerful than encourages for example : the author encourages us to feel like.... but I want a word more powerful that is like the author is forcing us to feel that way

    asked on May 9, 2016
  79. calculus help amigos

    Find the point on the line 5x+5y+7=0 which is closest to the point (3,−4)

    asked on May 7, 2016
  80. Calculus quick question pls

    Why is there no vertical asymptote on F(x) = x/(x^2+1) What i learned is that to find vertical asymptote you have to set the denominator To 0 and solve for x ? In that case I find that x=-1,1

    asked on April 24, 2016
  81. PHYSICSSS emergency

    = 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with the

    asked on April 16, 2016

    m1 = 1.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 60 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.4 kg that hangs vertically. The system starts from rest with

    asked on April 15, 2016
  83. maths

    There are 40 students in a class.14 of these students are girls. What percentage of the class are girls?

    asked on April 5, 2016
  84. Social Studies

    Which solution would best help control pollution in Lake Tai while keeping Wuxi strong? People should move away to make more parkland. Factories in Wuxi should limit their waste. ** Farmers should grow fewer crops. All factories in Wuxi should be closed.

    asked on March 9, 2016
  85. physics help plz :)

    A bicycle spins 10 revs in 5.7 sec. The radius of the wheel is 15 cm a drop of water is 0.3 grams. What height will the drop of water reach when it comes off the wheel?--- I know that I have to use the v=we equation and that grams need to be in kg. But I'm

    asked on November 15, 2015
  86. Chemistry

    The question says: when .422 g of phosphorus is burned, .967 g of a white oxide is obtained. Determine the empirical formula of the oxide. I did the calculations and got that there would be 1 mole Phosphorus and 4.29 mol Oxygen. To get the empirical

    asked on September 28, 2015
  87. math


    asked on June 1, 2015
  88. finite math

    An urn contains 4 red, 6 white, and 3 blue marbles. Three marbles are selected at random and without replacement. What is the probability that one of each color is selected? Give your answer as a decimal number, with 3 decimal places.

    asked on February 22, 2015
  89. Math

    Writing with exponents 2x2x2

    asked on December 3, 2014
  90. math

    At a supermarket,pineapple sells for $1 per pint(16 oz).Greg wants to buy eightin 40-oz cans of pineapple juice from the supermarket.How much does he have to pay altogeather?

    asked on October 6, 2014
  91. Math

    In the number 7,725, which places contain digits where one digit is ten times as great as the other?

    asked on August 14, 2014
  92. business

    Mr . X calls your office to see your employer, who has forgotten about the appointment and is now lunching at his club with an important overseas client. How would you deal with the situation?

    asked on March 15, 2014
  93. Help! - Writeacher!!

    Help!! Can you check my answers? 1. The small boat was scudding into the open sea with a full sail. (1 point) getting stuck sinking deeply moving swiftly* rocking harshly 2. As an outdoor enthusiast, Kristina abhorred the fact that people left debris along

    asked on March 12, 2014
  94. project management

    explain ES=5, LF=5, SL=O

    asked on August 23, 2013
  95. university of the south pacific

    at high noon, the sun delivers 1000w to each square meter of a blacktop road.if the hot asphalt transfers energy only by radiation, what is it's steady-state temperature?

    asked on May 30, 2013
  96. chemistry

    If 22.0 of gas has a volume of 0.22 at 320 , what is its pressure in mmHg?

    asked on April 6, 2013
  97. Dynamics

    It takes 16s to raise a 2800lb car and the supporting 650lb hydraulic car-lift platform to a ht of 6.5 ft. Knowing that the overall conversion efficiency from electric to mechanical power for the system is 82% determine a) the average power output

    asked on February 22, 2013
  98. math

    show me how to do 400 divided by 43.18=

    asked on November 19, 2012
  99. Physics

    A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.21 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.03.

    asked on November 7, 2012
  100. Physics

    An elevator accelerates upward at 1.2 m/s2. The acceleration of gravity is 9.8 m/s2 . What is the upward force exerted by the floor of the elevator on a(n) 92 kg passenger? Answer in units of N

    asked on October 22, 2012


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