PLEASE HELP! I'm doing a physics demonstration, and in part of it I'm trying to explain why steel wool burns and normal steel doesn't. I know it's something to do with the smaller surface area and/or mass but I don't

44,880 results
  1. math

    A school has 63 students studying Physics, Chemistry and Biology. 33 study Physics, 25 Chemistry and 26 Biology. 10 study Physics and Chemistry, 9 study Biology and Chemistry while 8 study both Physics and Biology. Equal numbers study all three subjects as

  2. maths

    A survey o 85 students asked them about the subjects they liked to study 35 students liked maths,37liked history,26 liked physics,20 liked maths and history,14 liked maths and physics,2 liked all the subjects. a) how many of these students like maths and

  3. Physics

    As part of a physics experiment, you stand on a bathroom scale in an elevator. Though your normal weight is 690 N, the scale at the moment reads 588 N. (a) Is the acceleration of the elevator upward, downward, or zero? (b) Calculate the magnitude of the

  4. Math

    In a class of 100 students, 40 offer Biology and 10 offer Chemistry and Biology .10 offer Physics and Chemistry , and 30 offer Physic and Biology . Each student offer at least one of the three subjects. The number of students who offer Biology is equal to

  5. Mathematics

    In a class,30 offer Biology,21 offer Chemistry and 22 offer Physics.15 offer Physics and Biology,10 offer Physics and Chemistry and 13 offer Biology and Chemistry.2 offer Physics only,3 offer Chemistry only and 7 offer Biology only. a.illustrate this

  6. Math

    In a class of 156 students who took maths and physics they all passed at leat 1 subject 75 pass math and physics.if twice has passed physics find how many students pass math only. Represent in Venn diagram.

  7. Physics Need quick help please

    Estimate the total binding energy for copper. 550 MeV Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons. E= in Joules Please help me out I got 1st part I need the Energy in joules am confused please help me

  8. Mathmatics

    2. All the students in SS3 of a named school take either Mathematics (M), or Physics (P) or Chemistry (C). 40 take Mathematics, 42 take physics, 38 take Chemistry, 20 take Mathematics and Physics, 28 take Physics and Chemistry while 25 take mathematics and

  9. GS 104 Physics (Physical Science)

    Trucks often have signs on their backs that say, "If you can't see my mirrors, I can't see you." Explain the physics here.

  10. math

    Consider the pair of linear equations below. 4x+6y=12 2x+3y=6 Part A: What is the relationship, if any, between 12 and 6? Part B: Do the two equations have one solution, no solution, or infinitely many solution? Explain. Part C: How can you verify your

  11. science

    Explain how this interactive demonstration is a "model."

  12. Life sciences

    Aim:to demonstrate that expired air contains carbon dioxide 1-Briefly explain your observations 2- Suggest a suitable control for this demonstration 3 what can be concluded from this experiment 4 labelling experimental set-up

  13. math

    Part A: Explain why the x-coordinates of the points where the graphs of the equations y = 4x and y = 2x−2 intersect are the solutions of the equation 4x = 2x−2. Part B: Make tables to find the solution to 4x = 2x−2. Take the integer values of x

  14. Physics (Final Review)

    Ok so tomorrow is my Physics final and I have so much depending on this one test ( all my other grades are 80 and above but this one is a low 70). I have studied for the final but if anyone could supply me with a list of most know formulas for physics I

  15. Mathmatics

    2. All the students in SS3 of a named school take either Mathematics (M), or Physics (P) or Chemistry (C). 40 take Mathematics, 42 take physics, 38 take Chemistry, 20 take Mathematics and Physics, 28 take Physics and Chemistry while 25 take mathematics and

  16. overview of teaching techniques

    which technique is used after a student gives a wrong answer and the teacher continues to aim questions at that student? (a)redirecting (b)probing(my answer) (c)inquiring (d)diverting which of the following guidelines for demonstrations is good advice to

  17. Math

    DO NOT CLICK THE OTHER ONE I WILL PAY MONEY, ONLY AFTER THE ANSWER IS PROVEN RIGHT For the three-part question that follows, provide your answer to each part in the given workspace. Identify each part with a coordinating response. Be sure to clearly label

  18. Math

    I WILL PAY MONEY, ONLY AFTER THE ANSWER IS PROVEN RIGHT For the three-part question that follows, provide your answer to each part in the given workspace. Identify each part with a coordinating response. Be sure to clearly label each part of your response

  19. 11th grade physics

    my physics teacher asked the class to find a cool physics topic and write a summary and a reflection on it 1page.... any ideas im really stuck

  20. Maths

    In a science class of 120 student ,56 passed physics,61 passed chemistry ,60 passed biology,20 passed both physics and chemistry 24 passed both physics and biology,26 passed both chemistry and biology and 5 passed none of the three subjects. (1). Draw a

  21. @elena

    thank you so much help with the problem. i have trouble solving part b of the problem you helped me with. it told me to give it as a percentage, I got 10% but it is wrong. can you please help me Superman must stop a 190-km/h train in 180m to keep it from

  22. Physics

    In a demonstration in physics class, a 1.2 kg dynamics cart starts from rest at the top of a ramp. the ramp is 2.4 m above the ground. the cart then rolls down to the bottom of the ramp, where it collides with a stationary 1.4 kg dynamics cart. Assume that

  23. Physics

    I am taking an online course in physics and I need to write a short paper on Analog and digital information. Below are the questions that guide me through the paper. I am having a hard time finding a website that can explain this to me. There is no text

  24. Physics

    So... The task is to evaluate the design of three types of car tires, and explain how each type differs to maximize performance. Physics terminology is to be included in our report. -------- I just need a starting point. What types of tires do you

  25. Physics

    Test Bank, Question 13 In a classroom demonstration, a 79.2-kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the

  26. Mathmatics

    2. All the students in SS3 of a named school take either Mathematics (M), or Physics (P) or Chemistry (C). 40 take Mathematics, 42 take physics, 38 take Chemistry, 20 take Mathematics and Physics, 28 take Physics and Chemistry while 25 take mathematics and

  27. physics

    In a classroom demonstration, a 790-N physics professor lies on a “bed of nails.” The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the

  28. Physics

    In a classroom demonstration, a 79.2-kg physics professor lies on a “bed of nails.” The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the

  29. Physical Conceptual Science

    Trucks often have signs on the back that say, “If you can’t see my mirrors, I can’t see you.” Explain the physics.

  30. Data Management

    At a banquet, 4 coupes are sitting along one side of a table with men & women alternating. a) how many seating arrangements are possible for these eight people? b) how many arrangements are possible if each couple sits together? explain your reasoning.

  31. Psychology

    Please give me an answer ASAP. Directions: Explain which part of the study is the Dependent Variable and explain which part is the Independent Variable, and why. John is interested in studying how people hold their books in the hallway. Some hold them off

  32. Algebra help please

    Part A: Divide (16x^5y^4 + 6x^3y - 2x^2y - 24x^2y^4) by -2x^2y. Part B: How would your answer in Part A be affected if the x2 variable in the denominator was just an x? Part C: What is the degree and classification of the polynomial you got in Part A? Is

  33. Math

    Consider the following indefinite integral. I= ∫ tan(x)sec^2(x) dx Part 1 of the question was to evaluate I using substitution, u=sec(x) my answer: (sec^2(x))/2 +C Part 2: evaluate I using substitution, u=tan(x) my answer: tan^2(x)/2 + C Part 3 is to

  34. math

    1.42, 3.45, 7.01, 5.8, 6.22, 2.15 (Part A) What is the median of this set? (Part B) Explain how you found your answer.

  35. SCIENCE

    I need help with my reasons for the seasons portfolio my teacher won't respond to me. This is what I have so far I don't know if i'm right with the answers I put down already: Identify the independent variable in this experiment. # Answered The textbook

  36. Physics

    PLEASE HELP! I'm doing a physics demonstration, and in part of it I'm trying to explain why steel wool burns and normal steel doesn't. I know it's something to do with the smaller surface area and/or mass but I don't know WHY it burns because of this. Can

  37. English

    Will you please help me with a few language problems: 1)is the article necessary in the phrase "representatives of the (?)mass media" ('mass media' goes with the article in the dictionary but is it possible to omit it in the phrase) 2)does the sentence

  38. Chemisrty

    Identify the type of question. Is it a literature research question, observation only question, demonstration question, or investigation question? How would you determine the PH of vinegar using cabbage juice as an indicator? (investigation) Do germaniting

  39. Physics Drwls

    I was wanting help with my physics post and since no one replied I thought there wasn't a physics tutor on Jiskha, but came back on today cause I really need to get a hang of my physics stuff and luckily seen you Drwls. A bike rider approachea a hill with

  40. physics

    In preparation for a demonstration on conservation of energy, a professor attaches a 8.7-kg bowling ball to a 3.2-m-long rope. He pulls the ball 18° away from the vertical and holds the ball while he discusses the physics principles involved. Assume that

  41. Physics

    I am taking an online course in physics and I need to write a short paper on Analog and digital information. Below are the questions that guide me through the paper. I am having a hard time finding a website that can explain this to me. There is no text

  42. Physic

    In a dramatic lecture demonstration, a physics professor blows hard across the top of a copper penny that is at rest on a level desk. By doing this at the right speed, he can get the penny to accelerate vertically, into the airstream, and then deflect it

  43. physics

    In preparation for a demonstration on conservation of energy, a professor attaches a 7.2-kg bowling ball to a 3.4-m-long rope. He pulls the ball 23° away from the vertical and holds the ball while he discusses the physics principles involved. Assume that

  44. English

    WHICH OF THE FOLLOWING SENTENCE INCORRECTLY USES A COMMA? A.We had to decide among steak,lobster, and pork roast. B. Before we could enter the building ,we had to show our identification badges. C. The car that was used as a demonstration in the race,is

  45. physics

    For a class demonstration, your physics instructor pours 1.16 kg of steam at 100.0°C over 4.69 kg of ice at 0.0°C and allows the system to reach equilibrium. He is then going to measure the temperature of the system. While the system reaches equilibrium,

  46. physic

    For a class demonstration, your physics instructor pours 1.16 kg of steam at 100.0°C over 4.69 kg of ice at 0.0°C and allows the system to reach equilibrium. He is then going to measure the temperature of the system. While the system reaches equilibrium,

  47. English

    Hello! I will type 2 exercises from the lesson I am teaching on Wednesday-english as a foreign language - 8th graders ( it will be graded) I need you to help me with some ideas. It says: LEAD- IN: A Here is a list of some natural sciences: BIOLOGY

  48. chemistry

    Table of enthalpy of solution for selected cesium salts Compound and ΔsolH kJ mol-1: - Cesium bromide: 25.98 - Cesium iodide: 33.35 - Cesium chloride: 17.78 - Cesium fluoride monohydrate: -10.46 - Cesium fluoride sesquihydrate (·1.5H2O): -5.44 Data taken

  49. Physics;Help!!!!!!

    There is apparently no one online who can help with physics questions right now. Please check back later to see if a physics teacher has addressed your question. Multiple posts won't get faster answers. Thanks. =) The question is in the first question

  50. math

    Part A: Solve the inequality for x and explain if the solution is reasonable or not. Part B: Explain how each piece of the inequality corresponds with the situation. If the inequality is incorrect, explain why that/those part(s) of the inequality is/are

  51. Physics

    Could someone help me to say this better? I have to Distinguish between atomic physics and nuclear physics, so here is what i have. which deals with the atom as a system of electron(s) and a nucleus and nuclear physics, which considers atomic nuclei alone

  52. physics

    thanks for the help earlier just got a question I'm taking AP Physics B this year does that mean next year I would Take AP Physics C??? I don't know if the material in C convers the same material plus the additional calculus material or what??? Could I

  53. math

    Part A: Using the graph above, create a system of inequalities that only contain points D and E in the overlapping shaded regions. Explain how the lines will be graphed and shaded on the coordinate grid above. (5 points) Part B: Explain how to verify that

  54. Physics and movies

    we are supposed to relate physics to movies, and state mistakes or errors found in the movies based on physics principles. I am trying to do Willy Wonka the 1971 version...I need help trying to prove that Violets becoming a blueberry is impossible and an

  55. Science

    List all of the things that are physical property. You will find some listed here. http://nobel.scas.bcit.ca/chem0010/unit2/2.2_properties_physical.htm There are very many others, but they would require a lot of effort to explain what they mean. Isn't

  56. algebra :( help me!!

    The table below shows the weekly earnings of two groups of employees working part-time at a local grocery store. GROUP A: $245, $224, $218, $295, $214, $312, $284 GROUP B: $223, $230, $310, $246, $295, $301, $215 PART A: What is the mean for each group?

  57. Physics Find mass and radius of planet.

    While visiting Planet Physics, you toss a rock straight up at 15 m/s and catch it 2.4 s later. While you visit the surface, your cruise ship orbits at an altitude equal to the planet's radius every 240 min. What is the mass of Planet Physics? What is the

  58. english

    Which one of the following sentences containes an unnecessary comma. A. We had to decide among steak, lobster, and pork roast. B. Before we could enter the building, we had to show our identification badges. C. The car that was used as a demonstration in

  59. Thermal physics

    Explain thermal physics in details

  60. math

    identify the bias student surveys that students in his calculus class and finds that 7/33 students are physics majors. he uses the data to predict the percentage of all students at his college who are physics student a. sampling bias because the sampling

  61. chemistry

    Based on how the indicator phenolphthalein worked in Lab III, explain why the golden rod paper turned color when sprayed with Windex (a base) and changed back to the golden rod color when treated with vinegar (an acid) in the demonstration in class.

  62. REPOST

    CAN someone please give me a good idea as how to find information for this problem: we are supposed to relate physics to movies, and state mistakes or errors found in the movies based on physics principles. I am trying to do Willy Wonka the 1971

  63. Physics

    Hello! I live in Mexico, and I have a couple of questions I asked on Y answers, both English and Spanish, and have gotten no reply, and I need to turn this in for my bimonthly exam in physics this Monday. I need to calculate the volume and surface area of

  64. Sta 112

    This is my question every one . Please help me have it already I had 6 as my answer. In a class of 50 student 28,22,20 of them offer physics,chemistry and biology respectively also 4 of them offer physics and chemistry but not biology,3 offer physics and

  65. AP physics

    do you guys have an someone that good with advanced physics, because i have a few problems that i am not sure how to do and its for my AP physics class, and I wasn't sure if you had someone on board now that could help thanks

  66. Physics

    Research on the physics of living systems.Give two examples to show how physics

  67. Physics

    I am trying to help my step son who missed half of physics class due to a funeral. A laser beam is being shot through two different materials that have been stuck together. if theta 1 = 65.5 and theta 2 = 49.8 what is the index of refraction? (I got 1.2

  68. Math-Help

    Consider the pair of linear equations below. 4x+6y=12 2x+3y=6 Part A: What is the relationship, if any, between 12 and 6? Part B: Do the two equations have one solution, no solution, or infinitely many solution? Explain. Part C: How can you verify your

  69. physics

    what is physics? i know that its subject but what is definition of physics? The study of matter, energy, space, and time, and the interactions thereof.

  70. math

    Tran has made a plan to help him study for his math exam. He has broken the material that he has to study into two parts: part A and part B and has, at most, 2 h every evening over the next week to study. He wants to spend at least twice as much time

  71. physics

    Explain what ideas led Bohr to suggest a new atomic model; and state Bohr postulates. Explain also, in words, what the correspondence principle is in atomic physics.

  72. physics

    A small airplane with a wingspan of 13.5 m is flying due north at a speed of 70.8 m/s over a region where the vertical component of the Earth's magnetic field is 1.20 µT downward. (a) What potential difference is developed between the airplane's wingtips?

  73. Thanks

    I would just like to sat thanks to drwls for helping me a bunch with the physics questions...AP physics is pretty hard..thanks again, whoever you are.. I am sure i will be back plenty of times!

  74. college physics

    This site is just a front for liveperson Most college physics questions are not answered for months if ever. Out of "200 experts" you must have somebody who knows physics right? Guess not.

  75. physics

    explain the physics concept to why a ship sounds when moving in water?

  76. ALEGEBRA 1

    Part A: Explain why the x-coordinates of the points where the graphs of the equations y = 2−x and y = 4x + 3 intersect are the solutions of the equation 2−x = 4x + 3. Part B: Make tables to find the solution to 2−x = 4x + 3. Take the integer values

  77. algebra 1

    Part A: Explain why the x-coordinates of the points where the graphs of the equations y = 4x and y = 2x−2 intersect are the solutions of the equation 4x = 2x−2. Part B: Make tables to find the solution to 4x = 2x−2. Take the integer values of x

  78. how come no one is helping on physics questions!!!

    every physics helpers are not getting any responses. can someone help on physics questions pleases???

  79. PHYSICS, still cant get it

    A man (weighing 915 N) stands on a long railroad flatcar (weighing 2805 N) as it rolls at 18.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 40.00 m/s relative to

  80. Physics

    Physics Report! What should i write..please help me need ideas !best answer!? Well First my report should be focused on Circular Motion OR Energy and momentum All the report says is to spend a day or two analysing the world around you in terms of Linear

  81. physics

    explain the physics principle why the size of tree stem decreases upwards?

  82. physics

    what are the 4 main kinds of long-distance communication? I have no idea what you mean here, in physics. Can you explain?

  83. Math

    This is a demonstration for my friends at school.

  84. Deciding on a H.S. Science Course

    I'm currently a sophomore, and I need to plan a science course for next year. Do you know if colleges require physics? Would a college prefer to see physics on my transcript in oppose to Environmental Sciences or Astronomy? Thanks!!

  85. Physics

    A physics major is working to pay his college tuition by performing in a traveling carnival. He rides a motorcycle inside a hollow transparent plastic sphere. After gaining sufficient speed, he travels in a vertical circle with a radius of 11.8 m . The

  86. physics

    I am a bit of an overachiever, and I've developed a habit of reviewing subjects during the summer before I take them in the new year. I was just looking through the posts on this site for review, when a certain physics question caught my attention. It was

  87. Math

    Hi, I tried this problem different ways, but keep getting it wrong.I am rusty, and need a demonstration of how to do it, thanks! 2x+6.7x-6

  88. Physics

    During the war in iraq, the us military was extremely successful at detecting and striking enemy targets. many news correspondants suggested the coalition forces had a spy satellite at an altitude of only a few hundred kilometers permanently positioned 34

  89. Physics Urgent!!!!! I really need help with this

    Sorry to repost this, again, but I still don't understand. Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be

  90. Physics (please help!!!!)

    Sorry to repost this, again, but I still don't understand. Newton’s Law of Gravity specifies the magnitude of the interaction force between two point masses, m1 and m2, separated by the distance r as F(r) = Gm1m2/r^2. The gravitational constant G can be

  91. Mathematics

    How can the number 39 be divided into two parts in order that the sum of 2/3 of one part and 3/4 of the other part is 28? Explain your workings

  92. Calculus

    Hi, please I need help with this demonstration: If “f” , “g” :[ 0,1]→R are continuous functions, they are differentiable in (0,1), f(0)=0, g(0)=2 and │f ‘ (x)│≤1 ,│g ‘ (x)│≤1 for the interval (0,1). Prove that f(x) < g(x) in

  93. MATH

    It's me again, I didn't have the sign after the 6. It was suppose to look like this. 2x+6>7x-6 I just need a demonstration on how to do it, I am rusty! Thanks, Tina

  94. To. Ms. Sue

    Ms. Sue you know the letter I posted, I am not sure if I have included this part in it: Explain why it is undesirable to improve working conditions. This was the part that I was stuck on as well.

  95. Physics

    The spring shown in the figure is compressed 59cm and used to launch a 100 kg physics student. The track is frictionless until it starts up the incline. The student's coefficient of kinetic friction on the 30∘ incline is 0.14 . k= 80,000 N/m m=100 kg uk=

  96. physics

    just wondering if anybody have any suggestions for a physics project (anything that deals with physics)??? thanks Research the Klien-Fogleman wing and its advantages over conventional wing shapes.

  97. Physics

    Physics Help!!!!! Maximum Kinetic Energy based on a graph? A 2.50kg ball is attached to an unknown spring and allowed to oscillate. The figure shows a graph of the ball’s position x as a function of time t.(Figure 1) Part A: What is the maximum kinetic

  98. Maths

    Separate 178 into two parts such that the first part is 8 less than twice the second part. Explain!

  99. Physics

    I posted this earlier and no one responded so I am going to try again. I have to Distinguish between atomic physics and nuclear physics, so here is what i have. which deals with the atom as a system of electron(s) and a nucleus and nuclear phys

  100. Physics

    Specifically, which of the following best expresses your view: i. Many physics concepts make a lot of sense and connect to everyday experience; but formulas are more of a problem-solving tool than a sense-making tool. ii. It really depends on the formula.

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