physics please HELP !

130,975 results, page 27

  1. Physics.

    A car starts a race from rest on a circular track and has a tangential speed of 43 m/s at the end of the third lap. The track has a radius of 91 m. If it has constant angular acceleration, what is the magnitude of its tangential acceleration? Help me and please explain in ...
  2. Physics Help

    On the Acme W&W company production line, parts have to be transported 100 m by conveyor belt to a machine area. The parts move at a constant speed of 2.5 m/s. How much time does it take to move a part 100 m? Show steps please! Thank you!
  3. Physics

    A block of iron at 415°C is put into a 0.625 kg tub of water at 15.0°C. They come to equilibrium at 100°C, and 0.144 kg of the water boils off to steam. What is the mass of the iron block? Please help, it keeps saying I have the wrong answer.
  4. physics

    research on the physics of living systems.give to examples to show how physics help to understand the concepts of evolution,biological systems of living organisms.
  5. physics

    light travels from ethanol intro crown glass. what's the brewster angle in this situation? illustrate your answer with a light ray diagram. what's the signifcance of this angle of incidence? n1=1.36for ethanol nR=1.52 for crown glass tanangleB=nR/ni =1.52/1.36 =1.12 (48.2 ...
  6. Math

    How do I express these in scientific notation AND Log10 form? 1) ln(8.1) 2) 32.8 x 10^-2 + 3.15 x 10^-1 3) 10^-2 x 10^4.5 4) 10^-45 5) 8^2.34 Please show some effort, and please stop posting under multiple names.
  7. Writing PLEASE HELP!!!!

    i need a story that has a genre of realstic fiction please its due tomorrow!! Cold Mountain or Thirteen Moons by Frazier are two
  8. DrBob222 help me!!

    Please I posted a chemistry question but I havent gotten any answer back please help me, sorry for having so little patience answered below.
  9. Critical Thinking

    A strawman is when someone makes a claim,or refute by putting words in someones mouth.Please help I need an example sentence please!!!!!!!!!
  10. To FRANK or SUE - re DATABASE

    1. Please release your Caps Lock key. 2. Copying/pasting is clearly not working for you. Please type in your question by hand.
  11. science

    what is the word to put in the blank? A(n)_____________is a summary of what you have learned from an experiment. PLEASE help! whoever answers this please type an answer nicely. Thank You!!
  12. biology

    what does the statement mean many discoveries lie in wait for the tools needed to make them? thank you.please i need the answer before i go to school in the morning. please help!
  13. biology

    if hydrogen flouride (HF) is dissolved in pure water will the pH of the solution be lesser or greater than 7? please explain why? thank you so much ! please i need the answer tonight!!!!!
  14. third grade hw help

    Hello All, Please help my son with his Math fraction. He needs to put the below fractions in ordedr from least to greatest. 1) 2/4, 2/3, 2/7, 2/5 2) 1/2, 6/7, 5/7, 1/10 3) 1/2, 6/7, 1/12, 2/3, 11/12, 1/6, 1/3, 1/4, 4/5 Please help!!! Thanks.
  15. Math

    Hi - I'm finding this question a bit tricky and think I answered it wrong, can someone please verify for me? Many thanks.... In triangle EFG, find the value of f, if e = 7.3 cm, g = 8.7 cm and <E = 73. Please help
  16. Math(Please help, very confused!)

    A piece of copper contains 3.6 x 10^8 atoms. What is the volume of the sample in units of liters? i have no idea how to start this. Please help thank you!!!
  17. Algebra

    How do I solve these equations? I was out sick a whole week :( please no direct answers. I want to know the process as well. -a=5 4/5x=20 -2/3y=-18 -x/3=18 Please note that the / are fractions. Thank you so much in advance!! :)
  18. Algebra

    Help please (x^3 + 3x^2 - 2x+7)/(x+1)=11 I don't how how to solve this at all-the answer should be 11 but I don't have a clue how to get it-please show me this one so I can hopefully do my homeowrk-we did this in class today but I don't understand it
  19. Math

    Please check my answers and if there are any other possibilities then please tell me. List all the factors for 45: I got 1x45, 3x15 and 9x5. are there anymore?
  20. BIOLOGY please help!!

    Negative allosteric effectors in the citric acicd cycle. Theres four: I have NADH and ATP What are the other two please help
  21. Psychology

    Please help me: explain why individualistic and collectivistic cultures differ in their tendency to make the fundamental attribution error in. Please 80 to 100 words, Thank you in advance.
  22. math please help

    Write an equality to describe the situation. A sleeping bag will keep a person warm in temperatures down to -20°F. Please I really need help.
  23. Social Studies

    How did Diocletian try to reverse the decline of Rome? Please help! I don't get it :( Which event usually marks the fall of the Western Roman Empire? Please help!
  24. English help please

    Which of the following personal completes the sentence correctly? One of my brothers just received ____diploma? A. his B. him C. their I think it is A or B. Can't quite decide. Please help.. Thank you
  25. College Algebra

    Write the following a+bi form i(3.14-3i) Please help. I believe that the answer is 3.14i-3i, which would be (3.13*-1)-3*-1. however this was incorrect please tell me where I went wrong
  26. Algebra 1 (PLEASE HURRY!!)

    {3x+y=-9 {-3x+-2y=12 What is the y-value of the solution to this system of equations? A. -7 B. -3 C. -2 D. -1 I tried them all and I must have did something wrong because none of them worked. Help please!! Thanks.
  27. ELA

    What differences became matters of life and death during the Holocaust? There are no choices in the question. SOMEONE HELP ME PLEASE. MS. SUE, WRITETEACHER,SOMEBODY HELP ME PLEASE
  28. Math (exam tomorrow)

    For the function f(x)=3cos(2x),what is the first point where it is increasing the fastest? Also please tell me how you know or derived that! Thank you!!! Please answer ASAP
  29. biology

    someone please help me im confused and idk what im doingg how would i create a dna molecule model using straws, pushpins, and paperclips? help me, please.
  30. pre calc

    Can someone please help me f(x)=1/3 square root 1-2x and g(x)= (x-2)/x. Find and simplify (g of g)(3)/(g of f)(-24). The answer I got it -24/7 and i Am unsure If it is correct. Please show all work Thank you
  31. Science please help

    i am sorry to bother you Ms. Sue but i need to present your proposal of a device that minimizes heat transfer. can you please give a list of insulators
  32. maths

    find the following square roots,using 'prime factors': i) 784 ii) 7056. 1 iii) 20---- 4 please give answers and tell me how to do. please
  33. Math = please help =

    H t t p s : // w w w . C o n n e x u s .c o m / content / media / 975134-7312013-31730- PM - 451627306. jpg with out the spaces What is the surface area of the given figure? 10 cm 26 cm 36 cm 28 cm Please help -*-
  34. I really need help!

    Hi, I really need instructions. Can someone please tell me how to make a coordinate plane and a rectangle on the plane in Microsoft Excel 2013 please? I really I need an answer soon because this is due today!!!! Please someone help fast! Thank You :/
  35. physics

    I'm having a really hard time with this physics problem...not really sure where to begin or which equation to use....please help: You are assigned the design of a cylindrical, pressurized water tank for a future colony on Mars, where the acceleration due to gravity is 3.71 ...
  36. physics

    Skye is trying to make her 70 kg St. Bernard go out the back door but the dog refuses to walk. If the coefficient of sliding fricction between the dog and the floor is .5, how hard must skye push in order to move the dog with a constant speed? please explain!
  37. physics

    A 65.0-kg skier coasts up a snow-covered hill that makes an angle of 27.4° with the horizontal. The initial speed of the skier is 6.37 m/s. After coasting 2.07 m up the slope, the skier has a speed of 4.06 m/s. Calculate the work done by the kinetic frictional force that acts...
  38. Math 116

    7h+7j-6(7h-4j+5k) 7h+7h-6 Could help me with problem please, please
  39. Math

    Please please....... What is the domain and range of y=3^x-4?????
  40. Math

    Please Check My Answer Please!!! Thanks :) 9/4 = ?/12 54 36 45 27********* 27/90 = 3/? 3 10 9********** 27 32/? = 20/25 37 16*********** 26 40
  41. math

    please answer these please??(studyguide) 6. 6 to 8 and 18 to x A.20 B.22 C.24 7.9/36 and x/4 A.1 B.4 C.9 8.42/22 and 21/x A.12 B.11 C.10 9.x/7 and 5/1 A.25 B.30 C.35 10.20/x and 4/8 A.35 B.40 C.48
  42. math

    ratio please : (1 + 3 1/4) : (1 1/4 + 3 1/3) please teach me how to do it
  43. MATH

    Please help, solution set for 7(4z-3)>59 please.?
  44. english

    Hello! I'm a French student,I'm 17, I've learned the beginning of Freedom by Jonathan Franzen. Sometimes, it seems confused as it's my second language. So I need help, please. Can you explain what happened with Patty, Eliza, Carter, Richard and Walter in the chapter 2: best ...
  45. math help please

    Consider the function g(x)=x/x-7. a) Determine an equation for the vertical asymptote. b) State the domain. c) Determine an equation for the horizontal asymptote. d) State the range. e) Sketch the function. ( i will do it) f) Summarize the increasing and decreasing intervals. ...
  46. 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 radius of Planet Physics?
  47. Physics

    I have the equation 'change in distance = 1/2 x (vf+vi) x change in time (or delta t)' for uniform acceleration. However, I am totally lost when it comes to rearranging it. I need to rearrange it for inital speed (vi) and change in time (delta t). Can someone please help?
  48. Physics

    A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk? ***Can someone please step me through the problem step by step?***
  49. Physics=Please check

    I have an electrical circuit which has 20V shown on left side I=0.8A on top I = 0.3A on bottom I have to find the resistance Would I add 0.8 + 0.3 and then use the formula V = IR so it would look like this: 20V = 1.1A x R 20V x 1.1A = R
  50. PHYSICS HELP

    A fibre is fixed at one end it is stretched over a pulley (2.0kg) is the mass. if the mass per unit length of the fibre is 82g/m, calculate the velocity of the wave on the stretched fibre. (please show working)
  51. URGENT: Please help with Physics

    Suppose the mass of each of two spherical objects is doubled, and the distance between their centers is three times as large. How is the magnitude of the force of gravity between them affected? (Points : 5) It is 4/9 as large. It is 4/3 as large. It is 2/9 as large. It is 3/2 ...
  52. physics

    The figure below shows three charges at the corners of a rectangle of length x = 0.65 m and height y = 0.42 m. What is the electric potential at the center of the rectangle? the picture is of a rectangle with -6.1,+2.7,-3.3 as charges. Your submitted answer is : -4.67e4 V I ...
  53. Physics

    Sound of a certain wavelength is coming from within a room and passing through a rectangular door (a "slit"). If the width of the doorway is twice the wavelength of the sound, what is the diffraction angle è of the sound leaving the doorway? Please show me how to do this.
  54. aig math(please answer)

    4 kg of apples and 1 kg of berries cost $5.75 altogether. 2 kg of apples and 1 kg of berries cost a total of $3.25.How much must i pay to buy 5 kg of apples and 5 kg of berries?please show work. my answer is $10.50 am i right if not please tell me why and how?
  55. running.from.myself

    3. how many lines of symmetry are in a 8-sided snowflake? 10, 12, 8, 16 1. how many lines of symmetry are in a 6-sided snowflake? 10, 11, 12, or 6 if you wanted to make hearts on your snowflake,, which sides of the right triangle would you have to draw half of the heart? a. ...
  56. physics

    PLease HeLP! You work for a moving company and are given the job of pulling two large boxes of mass m1 = 112 kg and m2 = 287 kg using ropes as shown in the figure below. You pull very hard, and the boxes are accelerating with a = 0.21 m/s2. What is the tension in each rope? ...
  57. Physics

    In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 16 m/s at an angle of 32° above the horizontal. a) How long does it take for the ball to reach the wall if it is 5.2 m away? (b) How high is the ball when ...
  58. Physics please help!!

    A school yard teeter totter with a total length of 5.46 m and a mass of 35.9 kg is pivoted at its center. A 17.7 kg child sits on one end of the teeter totter. Where should a parent push with a force of 272 N in order to hold the teeter totter level?
  59. Physics

    (a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm? (b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the pendulum's energy is lost ...
  60. Physics**Scientist

    Please help me with this!! I really can't find it. 1) This scientist used his device by dropped a spool of wire through a magnetic field. 2)This scientist used a torsional balance to show that the magnetic repulsion between magnetic poles varied by the square of the distance. ...
  61. Physics

    A charge of 28.0 nC is placed in a uniform electric field that is directed verticall upward and that has a magnitude of 4.00*10^4 N/C. What work is done by the electric force when the charge moves (a)0.450 m to the right (b) 0.670 m upward (c) 2.60 m at an angle of 45 degrees ...
  62. Physics

    A 450 uF capacitor is charged to 295 V. Then a wire is connected between the plates. How many joules of thermal energy are produced as the capacitor discharges if all of the energy that was stored goes into heating the wire? I am totally confused I don't even know where to ...
  63. physics!

    An electric car accelerates for 8.0s by drawing energy from its 320-V battery pack. During this time, 1300C of charge pass through the battery pack. Find the minimum horsepower rating of the car. I need some ideas to do it!!PLEASE HELP!!!THANK YOU SO MUCH!!!!
  64. physics help please....

    After fixing a flat tire on a bicycle you give the wheel a spin. (a) If its initial angular speed was 5.17 rad/s and it rotated 10.6 revolutions before coming to rest, what was its average angular acceleration? rad/s2 (b) For what length of time did the wheel rotate? s
  65. physics please!

    A 0.21 kg block oscillates back and forth along a straight line on a frictionless horizontal surface. Its displacement from the origin is given by x = (16 cm)cos[(16 rad/s)t + π/2 rad] What force, applied to the block by the spring, results in the given oscillation? why ...
  66. physics

    The potential energy of a particle on the x-axis is given by U+ 8xe ^-xsquared/19 where x is 1 meter and U is in Joules. Please find the point on the x-axis for which the potential is a maximum or minimum. I've worked it three times and I get these three answers. Which one is ...
  67. physics

    A bowling ball of mass 7.3 kg and radius 9.6 cm rolls without slipping down a lane at 3.4 m/s. Calculate its total kinetic energy. I tried this problem with the equation 3/4mv^2 but I did not get the correct answer, could I please get help with step-by-step explanation of how ...
  68. physics

    A certain spring elongates 9 mm when it is suspended vertically and a block of mass M is hung on it. The natural frequency of this mass-spring system is: a)0.014 b)5.3Hz c)31.8Hz d)181.7Hz e)need to know M please explain the answer....and hope to answer soon.... thanks in advance
  69. college physics

    A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk? Can someone please help me solve this problem step by step. The ...
  70. physics please help!!

    You are lost in the woods with a friend. He's nearsighted and you're farsighted. You decide to start a fire to attract attention. Thankfully, it's a bright sunny day and you're both wearing your glasses. Whose glasses do you use to focus the sun's light to start the fire?
  71. Physics -- check answers please

    I am to fill in the blanks without a word bank, my answers are in brackets. 1. A ____ diffraction pattern is unique because it has a larger central maximum. (single slit) 2. the brightest, clearest diffraction pattern is created with a _____ (barrier)
  72. Intro Physics - Newton's third rule

    a piano mover raises a 1000 N piano at a constant speed using a very light rope in a frictionless pulley system. with what force is the mover pulling down on the rope? Show steps please! Thank you!
  73. NEED HELP PHYSICS!!!

    A person is flying a model airplane with mass 82.2 gram in a horizontal circular path on the end of a string 10.5 m long. The string is horizontal and exerts a force of 3.22 N on the hand of the person holding it. What is the speed (in m/s) of the plane? PLEASE LEAVE FULL ANSWERS
  74. Physics

    A 21 kg child swings on a playground swings 3.6 m long. What is period of her motion? 2) If her older brother, who weighs twice as much as she does, rides in the swing instead, what is the period of the motion? Assume the center of mass to be at the position of the seat in ...
  75. physics

    Consider a block on an incline plane. The coefficients of static and kinetic friction between the block and the incline are µs = 0.353 and µk = 0.31. Calculate the critical angle θc, where the block just begins to slide. Answer in units of ◦. The block weighs 1kg...
  76. Science, physics

    A ship is heading north at 15km/h in a tide moving at 6km/h westward. Determine the magnitude and direction of the resultant velocity of the ship. I can't answer it because I don't get the formula. And please give me the formula. I need the answer later. I'll wait! Thankyou in...
  77. Physics

    Johnny was in a closed door meeting and suddenly his phone rung. His immediate response was to cover his cellphone with his hand and then asked to be excused. Why did he cover his phone with his hand? PS: Please explain it briefly but the thought is very clear and easy to ...
  78. math ergent please...

    10.a)Solve the inequality x^3-5x^2+2x+8<0 by i) using intervals ii) considering all cases I did this but my teacher said that when i solved this: x^3-5x^2+2x+8<0 (x+1)(x^2-6x+8) (x+1)(x-4)(x-2)<0 She told me to show all the steps, but i don't know how to show more. so...
  79. Physics

    If 2.4 m^3 of a gas initially at STP is compressed to 1.6 m^3 and its temperature raised to 30 degrees C, what is the final pressure? I am having a little problem filling in the blanks...... I know that I need to use the formula P1v1/t1 = p2v2/t2 but I think I am missing ...
  80. Physics-PLEASE ANSWER, it's due soon!

    A copper calorimeter can with mass 0.202 kg contains 0.185 kg of water and 1.40×10^−2 kg of ice in thermal equilibrium at atmospheric pressure. If 0.900 kg of lead at a temperature of 417 degrees celsius is dropped into the can, what is the final temperature of the ...
  81. Physics

    A certain "brand-new" (never-used) 9.0 volt cell contains 40mC of charge. The Electric energy "stored" in the cell amounts to about (___) joules. 0.0 0.06 37.5 .36 60x10^-4 I'm not too sure how to figure this problem out. I initially thought 40/9, but the answer was not one of...
  82. English

    1. Please come to see me in the afternoon, when I will be free. 2. Please come to see me in the afternoon, and I will be free then. 3. Please come to see me in the afternoon, for I will be free then. 4. Please come to see me in the afternoon, and then I will be free. 5. Please...
  83. english

    I need a description of a major theme from The Robber Bridegroom by Eudora Welty, please please please. -Preferably the theme with "Jamie Lockhart is the bandit of the woods. And the bandit of the woods is Jamie Lockhart" Thank you!!!
  84. Physics

    My last problem for the day: A) The centers of two 11.00 kg spheres are separated by 0.09 m. What is their gravitational attraction? I got 9.96 x 10^-7 N. B) What is the ratio of this attraction to the weight of one of the spheres (at the surface of the Earth)? I'm sure this ...
  85. Physics- PLEASE HELP

    Assume you are agile enough to run across a horizontal surface at 11.60 m/s on an airless spherical asteroid of uniform density 1.0x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius? (b) the...
  86. PHYSICS - PLEASE HELP

    A 1.00 kg pendulum bob is released from a height of 0.200 m. Its speed at the bottom of its swing is 1.95 m/s on the first pass. How much energy is lost due to friction during one complete swing of the pendulum? I get Ep=mgh 0.2*9.8*1 =1.96 then i get Ek=1/2mv^2 1/2*1*1.95^2...
  87. Physics

    Two equal masses(1 and 2) are connected by an ideal rope across a pulley. This system is on a larger block A; 1 is on top of A, while 2 is hanging off the side, and the pulley rests on the corner of A. The question is what is the minimal acceleration of A such that masses 1 ...
  88. physics help!

    A wire of 62cm length and mass 13g is suspended by a pair of flexible leads in a magnetic field of 0.44T. What are the magnitude and direction of the current required to remove the tension in the supporting leads? Please also scroll down because I also have a question not ...
  89. Physics repost please check

    Posted by Mary on Monday, November 5, 2007 at 8:21pm. Suppose that the electric field of an electromagnetic wave decreases in magnitude. Does the magnetic field increase, decrease, or remain the same? Account for your answer. For Further Reading Physics - bobpursley, Monday, ...
  90. please i need help accounting

    i have a promblem it gives me the information and form i understand the information but cant fill out the form because i don't know how and its 71 points out of the whole exam. is there anyway u can help me out if i give you the information. its about transactions the first i ...
  91. English Literature

    Hello, I'm a English Literature student. I'm going to make a Project on William Shakespeare and John Milton. As I said, it's an English project, So please suggest me some good topics/title for both the projects. Also please give me some general tips and ideas. Please help, its...
  92. 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
  93. please check (physics)

    Current flows out of a 110V source through a 10 ohm resistor and then through parallel branches, one containing a 20 ohm resistor and the other a 30 ohm resistor. Find V I R P V I R P 50 5 10 250 60 3 20 180 60 2 30 120 _____________________________ 110 5 22 550 First R total...
  94. Physics please help

    Calculate the force required to pull a copper ball of radius 3.00 cm upward through a fluid at the constant speed 7.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force.
  95. physics please help !

    A helicopter is ascending vertically with a speed of 5.20m/s . At a height of 110m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: for the package equals the speed of the helicopter.]
  96. Physics Help!! I'm so confused!!!

    A fire hose sprays 450 liters of water a minute onto a fire with a velocity of 17.0 m/s. Water has a density of 1 kg/liter. What is the average force acting on the fireman holding the hose due to the water? PLEASE EXPLAIN.
  97. physics

    An animal-rescue plane flying due east at 40 m/s drops a bale of hay from an altitude of 73 m . The acceleration due to gravity is 9.81 m/s^2. If the bale of hay weighs 177 N , what is the momentum of the bale the moment it strikes the ground? Please help!
  98. Physics help please

    In an experiment done by scattering 5.5 MeV α particleson a thin gold foil, students find that 10,000 α particles arescattered at an angle greater than 90 degrees. How many α particles will be scattered between 60 degreesand 80 degrees?
  99. Physics

    i41 tinypic com/2qna74k png (add the periods) For the vectors in the figure, with a = 6.4, b = 2.5 and c = 6.87. Calculate a(dot)b calculate a(dot)c calculate b(dot)c I got 0 for a(dot)b but the same method (ac*cos(theta)) does not work for the other two, please help.
  100. Math ; please please help.

    1. Explain in detail how to determine the value of the independent variable in a quadratic relation if the value of the dependent variable is known. Please check my answer - You would substitute the value for the dependent variable, then you would solve for the independent ...
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