physics please HELP !

130,813 results, page 40

  1. Physics

    A high diver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. If her downward motion is stopped 2.30 s after her feet first touch the water, what average upward force did the water exert on her? I'm not sure how to ...
  2. grade 9 math

    can you please help me with this question, i'm completely lost. talia's uncle owns a warehouse and he has given Talia an area in which to store the computer supplies for his company. her uncle gave Talia 40 m of rope and told her to section off a rectangular area in a corner ...
  3. physics

    SOMEBODY ANSWER THIS PLEASE, Two people pull as hard as they can on ropes attached to a 170 kg boat. If they pull in the same direction, the boat has an acceleration of 1.59 m/s2 to the right. If they pull in opposite directions, the boat has an acceleration of 0.518 m/s2 to ...
  4. Physics-Please check

    If I have a diagram of Kepler's laws of planetary motion and it shows change in t1 larger than change in t2 and A1 larger than A2 and asks the question: which of the following is correct? 1.A3 = A3 2.change in t3 > change t3 3.if change t3 = change in t2, then the orbit is ...
  5. physics-help

    In the figure below, four particles are fixed along an x axis, separated by distances d = 4.00 cm. The charges are q1 = +2e, q2 = -e, q3 = +e, and q4 = +5e, with e = 1.60 × 10-19 C. What is the value of the net electrostatic force on (a) particle 1 and (b) particle 2 due to ...
  6. Physics-Please check my explanation so far

    If I had the old-fashion camera that had a focal length of 35mm(0.035m) and I take a picture of a person 6 feet away, how far does the film need to be from the lens to record a clear image? I know that the equation is 1/f = 1/d(object) + 1/d(image) so would I do the following...
  7. Physics please help me

    Two identical guitar strings are stretched with the same tension between supports that are not the same distance apart. The fundamental frequency of the higher-pitched string is 400Hz, and the speed of transverse waves in both wires is 200 m/s. How much longer is the lower-...
  8. Physics

    A figure skater rotates about a vertical axis through her center with both arms and one leg extended. Her rotation rate is 0.65 rev/s. She then pulls her arms and leg closer to her body and begins to spin at a 1.85 rev/s. What is the ratio of her new moment of inertia to her ...
  9. Physics

    A light string can support a stationary hanging load of 26.4 kg before breaking. An object of mass m = 3.19 kg attached to the string rotates on a frictionless, horizontal table in a circle of radius r = 0.795 m, and the other end of the string is held fixed as in the figure ...
  10. Physics

    A light string can support a stationary hanging load of 26.4 kg before breaking. An object of mass m = 3.19 kg attached to the string rotates on a frictionless, horizontal table in a circle of radius r = 0.795 m, and the other end of the string is held fixed as in the figure ...
  11. physics

    how many gram of ice at 0 c can be melted by the heat released when one gram of steam condense to water at 100 c check my answer please and you deman i am sorry by accident i post it the previous question solution Qcold=-Qhot MLf(ice)=-MlV(water) Mice = -(-0.001*2256000)/(...
  12. Physics

    A car moving at some speed hits the brakes and skids to a stop after 11 m on a level road. If the coefficient of friction for the road conditions of wet asphalt is 0.53, what was the car's original speed before braking? I have used multiple modes to find the answer and have ...
  13. Physics

    An airplane is travelling from Vancouver to Toronto following the jet stream. The plane cruised at an average speed of 1100 km/h for the 4000 km flight. How long did the flight take? If the plane left Vancouver at 3:00 am EST, what time did it arrive in Toronto? please show ...
  14. Geometry (PLEASE HELP!!!)

    Please Please HELP!!!! I need the answer to this and i've worked it out but I don't know if it is correct... Please check my answer!!!! The polygons are regular polygons. Find the area of the shaded region to the nearest tenth. I can't post a picture of it but it shows a ...

    Here are the figures. file:///C:/Users/ALIZAJOY/Pictures/Untitled.png Open that link please please help me with my assignments 1. in the figure , the areas of traingle cef, triangle abe, triangle adf are 3,4, and 5 respectively. find the area of triangle aef 2. equialateral ...
  16. Science/Math

    A radio wave has a frequency of5,000,000 Hz. Write this number in scientific notation. ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? This is not the right answer so hurry up as soon as possible ...
  17. vocab help

    i need 3 sentences using wretched plz help Please do not post the same question twice. Please follow directions below and let us know what you have come up with. We will give you feedback on the sentences you write.
  18. PLeASE Help

    Can someone please take a look at my biology questions I have posted? I am doing a lab that is due tomorrow ( Only got it today) and I haven't learned enough to properly answer these questions. Thanks!
  19. Math Algebra

    Find the Values of X 12p^2+11p-22=0 I'm having some trouble with this math question can somebody please explain it. Please I would like to know how to do it since I have a Benchmark Tomorrow. -thank you
  20. World Cultures grade 7

    Please help me asap! I have an essay due tommarow and I need to find out the 10 criterias a country has to follow in order to be considered a civilization! I have 5 minutes! Please help
  21. Math, Calculus

    help Please... Differential Equations Problems... please give the complete solution, so that i can understand how it is derived... tnx in advance, god Bless... Here are the problems : 1.) y dx + (2x+3y)dy = 0 2.) (2xy + y^(2) ) dx - 2x^(2) dy = 0 ;y = e, x = e 3.) y( x^(2) + ...
  22. Math

    Use the Binomial Theorem to determine the coefficient of x^14 in the expansion of  (3x^2 − 1/ 3)^ 16 . Express the coefficient as a fraction in its lowest terms. Please help me with this I'm getting nowhere. And please explain the logic behind! Thanks so much
  23. Math

    Hey can you please explain Fibonacci numbers in the simplest way possible because I really don't get them. Like i know the sequence goes 1,1,2,3,5,8,13,21, etc...But we have to fill in a table by plugging the numbers 1-9 in using the equation Fn+1. Please help me, Thanks
  24. AP Chemistry

    I have no idea how to answer this question: A compound effuses through a porous cylinder 3.20 time faster than helium. What is it’s molar mass? Help me please? Give a step by step detail please.
  25. ap history

    please explain the rise of class conflict between business and labor in the 1870s and the growing hostility to immigrants especially chinese i tried to google it but not much explanation. please HELP HELP HELP! THANK YOU SO MUCH!
  26. Chemistry Please HELP!

    calculate the mass of each product formed if 10.0 g of the first reactant is reacted with 10.0 g of the second reactant: NCl3 + 3 H2O → 3 HClO + NH3 (Please show me full working out)
  27. help

    i thought you were a helping site please help i read my lessons but i just coulnd answer some questions. help please i need to pass this test, i would really appreciate it your time. im new to this site
  28. college algebra--need help please!!

    information is given about a polynomial f(x)whose coefficients are real numbers. Find the remaining zeros of f. degree:5, zeros: -6, 6-i please help and show all work.
  29. college algebra--need help please!!

    information is given about a polynomial f(x)whose coefficients are real numbers. Find the remaining zeros of f. degree:5, zeros: -6, 6-i please help and show all work.
  30. college algebra--need help please!!

    information is given about a polynomial f(x)whose coefficients are real numbers. Find the remaining zeros of f. degree:5, zeros: -6, 6-i please help and show all work.

    I have 2 questions that I need help with please. 1.What are the three parts of the law of conservation of mass/matter? Do not need the definition but the 3 laws please. 2. How are velocity, speed, and acceleration related? I know how they are different only. Thank you
  32. Chemistry - help please

    The decomposition of NH4Cl can be accomplished by heating it in an evacuated cylinder. The products are NH3 and HCl gas. If the total pressure after heating is 4.4 atm, determine Kp. Please help me with the steps on how to do solve this.
  33. math/ algebra 1

    can someone please help me explain how they got this answer and can someone please show me the steps into solving this question? Q: Four more than the quotient of a number and three is at least nine.
  34. geometry circles equation i dont know

    please he lp Find the equation of a circle circumscribes a triangle determined by the line y= 0 , y= x and 2x+3y= 10 this is my first timein this website please help me need it badly my teacher will be angry at me so much
  35. Social Studies

    Please help me with the following question: The American Revolutionary War could not have been won without foreign aid. True False I think it is True, but I am not sure it that is correct. Please help, and I will appreciate it. Thank you for any help.
  36. Need math help please

    could someone please give me an example not an example using coins, marbles, spinner, like something different that would explain the difference b/w theoretical and experimental probability.
  37. Science Please Check!

    Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait? A- homozygous B- dominant C- heterozygous D- recessive My guess is D. Please help!
  38. Science

    Please explain what the authors, Hewlett, Martinez & Peters, Ted, mean when they write that the neo-Darwinian model is very fertile? Please explain one of their three examples of this fertility.
  39. Science

    Please explain what the authors, (Hewlett, Martinez & Peters, Ted), mean when they write that the neo-Darwinian model is very fertile? Please explain one of their three examples of this fertility.
  40. chemistry to MathMate

    Chemistry - CJ, Tuesday, March 31, 2015 at 10:53pm I am experiencing a major block.... I can't say.... 1micrometer= 1000nm 5micrometer= x..... because I'll get back the same thing So please help me, tell me the answer please.
  41. Algebra2 Help please

    Find the values of the 30th and 90th percentiles of the data. Please show your work. 129, 113, 200, 100, 105, 132, 100, 176, 146, 152
  42. Physics

    I have a question that I don't understand, could you please help me? Thanks! Heres my question: A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is Isn't the package moving at ...
  43. physics

    1. a 2 kg body is attatched to a spring of negligible mass and oscillates with a period of 1.00 s. The force constant of the spring is? 2. The force constant of a massless spring is 25 N/m. A mass of .45 kg is oscillating in simple harmonic motion at the end of the spring with...
  44. PHYSICS help please

    a DC-10 aircraft is flying at an altitude where the atmospheric pressure is 40% of sea level pressure. if the aircraft interior is maintained at sea level pressure, what is the size and direction of the net force acting on a cabin door that is 1.0 meters wide and 2.0 meters high?
  45. Physics

    A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1 6 g. Find the reading of the spring scale on the moon...
  46. Physics, so confused

    A cart of mass M1 = 5.00 kg and initial speed = 3.00 m/s collides head on with a second cart of mass M2 = 3.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. I am not sure how to find this answer without having a V2 for the first ...
  47. physics

    Arann launches a rock into the air such that it rises 20.0 m in the first third (time wise) of its ascent to maximum height. Determine the rock's maximum height and launch speed. Determine the time(s) at which the ball is at a height of 10m. PLEASE HELP
  48. Please help!!!!!Physics

    Find the resultant force on (a) the mass m1 = 0.183 kg and (b) the mass m2 = 0.106 kg (the masses are isolated from the earth).. The first mass is 400kg and its 10 cm from the second mass which is 0.183 kg (m1). the second mass is 10 cm away from the third mass which is 0.106 ...
  49. Physics Help Please

    Issac has to do 1000J of work on a 5kg box, and all the work he did simply went into lifting it above the ground. How high above the ground will the box be when all the work has been done?
  50. Physics(Please respond)

    An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 15.8 N. When completely submerged in water, its apparent weight is 13.0 N. What is the volume of the object? Would I start by doing 15.8 - 13?
  51. physics Elena please verify

    If the resistance between the center and the outer terminal on a 20 k ohm potentiometer reads 12 k ohms, the resistance between the center terminal and the other outer terminal is i have 12kohms
  52. Physics

    Hello, Could anyone help me with something about rolling motion? Well the question is the next: Does static friction cause a positive work in the rolling motion? I really don't get how the static friction is involved in rolling and if it causes work Please help
  53. Another physics please

    Rex flips a coin vertically upwards with an initial velocity of 0.262m/s. Determine the height to which the coin will rise above the initial height. At what velocity is the coin moving when Rex catches it.
  54. reading...please help

    i need to know who the antagonist is in the story money hungry and i need to know what the conflict in the ook is please help me....i really need help i gotta know this by tomorrow!
  55. please!

    I need help figuring this out please! :) Write an equation for this sequence and find the 15th term. Term Number 1 2 3 4 Term 0 1 2 3
  56. Pre-Cal(Please help)

    Find two functions f and g such that (f X g)(x) = h(x). (There are many correct answers.) h(x) = 4 / (5x + 2)^2 = My answers were: f(x) = 4 / 5x, and g(x) = 5x + 2 Please explain. These answers were wrong and I do not know how to fix them!!
  57. math

    will some one please!!!! please!!! help me I'm doing wacky wordies, only have 3 to do!!! decimal decimal decimal ed ot overs pos'-i'-tive' thanks so much!!
  58. Math (Algebra)

    Can someone please check my answer? 9[73-(-95-61)]= 2061 if my answer is incorrect could you tell me where I missed? and the correct answer please? Thank you I would appreciate it...
  59. adult education

    I need help with someone to go over my eassy with me can someone please help me.This is my first time using this site so I don't know how it really works SOMEONE PLEASE HELP ME!!
  60. Math

    Forty-eight decrease by a number is the same as the difference of four times the number and seven. Find the number. Please help me and show your work please and thank you
  61. Physics repost

    Please help!! I have tried everything and is still coming up with and incorrect answer. A piece of copper wire is formed into a single circular loop of radius 13 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.70 T in a time of...
  62. Physics repost please check

    A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.280 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.00 kg plate of food and a 0.210 kg cup of coffee. Obtain the force T exerted by the ...
  63. aig math(please answer)

    three bothers earned a total of $3,500. larry earned twice as much money as jim while adam earned half as much money as jim. how much money did jim earned? please show your work. my answer is 1000 am i right if not please tell me why and how.
  64. Intergated chemistry/physics

    Draw a setup containing 3 gears. For every turn of the input gear, you need the output gear to spin 9 times. The drawing doesn't have to be perfect, but make sure to label the input gear, the output gear, and the number of teeth on each gear. Please E-mail me the picture at ...
  65. physics

    Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 6-kg book. If your mass is 54 kg and you throw the book at 14 m/s, how fast do you then slide across the ice? (Assume the absence of friction. Let the direction ...
  66. Physics

    Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 9-kg book. If your mass is 45 kg and you throw the book at 10 m/s, how fast do you then slide across the ice? (Assume the absence of friction. Let the direction ...
  67. Physics

    A wave traveling in the +x direction has an amplitude of 0.50 m, a speed of 5.7 m/s, and a frequency of 18 Hz. Write the equation of the wave in the form given by either Equation 16.3 or 16.4. (Answer in terms of t and x. Assume standard units.) please check my answer: y= A ...
  68. AP Physics

    Could you please explain to me these problems, I don't understand them. Do 100 J of work in 50 s and your power output is? A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy of ? A diver who weighs 500 N steps off a...
  69. Physics

    Tom the cat is chasing Jerry the mouse across the surface of a table 1.5 m above the floor Jerry steps out of the way at the last second, and Tom slides off the edge of the table at a speed of 5.0 m/s. Where will Tom strike the floor, and what velocity components will he have ...
  70. College Physics

    Illinois Jones is being pulled from a snake pit with a rope that breaks if the tension in it exceeds 755 N. If Illinois Jones has a mass of 70.0 kg and the snake pit is 3.90m deep, what is the minimum time that is required to pull our intrepid explorer from the pit? Someone ...
  71. Physics

    A 2.0 kg particle is moving along the x axis to the left with a velocity of v= -6.0 m/s. Suddenly, between times t =0 and t = 4.0 x a net force = 3t^2 – 12t is applied to the particle, where F is in N and t is in s. Calculate the velocity of the particle at t=4.0 s. Is this ...
  72. physics

    A basketball player is trying to make a half-court jump shot and releases the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0 m from the basket, what speed must the player give the ball? PLEASE HELP! I have been working on this problem ...
  73. Physics! - PLEASE HELP

    A 75 kg passenger in a van is wearing a seat belt whent he van moving at 15m/s, collides with a conrete wall. The front end of the van collapses 0.50 m as it comes to rest. a) what was the paseenger's kinetic energy before the crash b) What average force did the seat belt ...
  74. physics- help please !!1

    A toy rocket moving vertically upward passes by a 2.2m -high window whose sill is 7.0m above the ground. The rocket takes 0.17s to travel the 2.2m height of the window part a) what was the launch speed of the rocker ? assume the propellant is burned very quickly at blastoff ...
  75. Physics

    A gray kangaroo can bound across level ground with each jump carrying it 8.4m from the takeoff point. Typically the kangaroo leaves the ground at a 23 angle. 1. Provide knowns and unknown values. 2. What is the initial velocity or takeoff speed? 3. What is its maximum height ...
  76. Physics

    The particles in the figure below (m1=1.6 kg and m2=3.5 kg) undergo an elastic collision in one dimension. Their velocities before the collision are v1i=12 m/s and v2i=-7.5 m/s. Find the velocities of the two particles after the collision. (Indicate the direction with the sign...
  77. please help me!! physics

    The masses of blocks A and B are 4.5 kg and 3.7 kg respectively. The blocks are initially at rest and are connected by a massless string passing over a massless, frictionless pulley. The system is released from rest. a. What is the acceleration of the blocks? b. What is the ...
  78. physics. I waited over two days for response

    An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.
  79. Physics kinematics

    An archer shoots an arrow at a 72.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 36.0 m/s? (Although neglected here, the atmosphere ...
  80. Physics

    A sign weighing 500N is suspended at the end of a uniform 300N beam 5m in length, as shown. The beam is attatched to the wall with a hinge, and its other end is supported by a wire. What is the tension in the wire if it makes an an angle of 30o with the beam? Help please. Use ...
  81. Physics

    A gun is shot horizontally from a building that is 10 meters high at a velocity of 220 meters/ second: I need to know what Vx is and Vy along with answering Vx after 3 seconds Vy after 3 second. We were given these equations Vy= Vy0-9.8t y= y0+Vy0t-4.9t^2 x=Vxt ,but I'm still ...
  82. physics

    An electron is moving through a magnetic field whose magnitude is 8.70*10^-4 T. The electron experiences only a magnetic force and has an acceleration of magnitude 3.50*10^14 m/s^2. At a certain instant, it has a speed of 6.80*10^6m/s. Determine the angle (less than 90degrees...
  83. Physics

    A 69kg skateboarder, at rest on a frictionless surface, throws a 4.0kg rock with the velocity given by v=3(i hat)+4(jhat), where the x and y axes are both in the horizontal plane. What is the x component of the subsequent velocity of the skateboarder? WHat is the y component ...
  84. Physics

    A 69kg skateboarder, at rest on a frictionless surface, throws a 4.0kg rock with the velocity given by v=3(i hat)+4(jhat), where the x and y axes are both in the horizontal plane. What is the x component of the subsequent velocity of the skateboarder? WHat is the y component ...
  85. physics

    I have a few questions that i am not too sure how to figure out... 1- as a racing car zooms by you, its pitch decreases by 20%. If the speed of sound is 345m/s, how fast is the car travelling? 2-a person has a threshold of hearing of 5db. another person has a threshold of ...
  86. physics ..PLEASE HELP ASSIGN DUE SOON :(

    A charge is to be placed at the empty corner to make the net force at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner if the three charges have the same charge of +7.63 μC?
  87. physics

    A robot probe drops a camera off the rim of a 245 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2. Find the velocity with which it hits the ground. Answer in units of m/s. 2)Find the time required for the camera to reach the ground. Answer in units of s. ...
  88. Physics(Please respond)

    A golfer, standing on a fairway, hits a shot to a green that is elevated 5.33 m above where she is standing. If the ball leaves her club with a velocity of 48.0 m/s at an angle of 35.7 ° above the ground, find the time that the ball is in the air before it hits the green. ...
  89. Physics

    A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 55.5kg and air resistance exerts a total upward force of 620N on her and her parachute. What is the combined weight of the parachutist and ...
  90. Physics

    You and some friends go bungee jumping, but you are afraid of oscillations which go too fast. Which one of these options would provide the slower oscillations? a) Tying two bungee cords to your feet such that each bungee cord is attached to your feet and the object which you ...
  91. physics... PLEASE HELP

    en meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail? (The linear expansion coefficient for steel is 12. × ...
  92. physics

    A hollow cylinder, a solid cylinder, a hollow sphere, and a solid sphere roll down a ramp without slipping, starting from rest. The ramp is 0.25 m high. All the objects have radius 0.035. What are their final speeds? Please show what equation you used and what you plugged in...
  93. Physics

    A small bug is placed between two masses (m1>m2) on a frictionless table. A horizontal force F is applied to either m1 or to m2, as shown. 1) In which case does the bug have a better chance of survival? HINT: Find the force of contact between the blocks in each case. Please...
  94. Physics

    Could someone please help me with my homework problem... a) Give the equation for terminal speed in the variables from Stoke's Law, and the densities of the sphere Ps and the fluid P1. b) Find the viscosity of motor oil (in kg/m/s) in which a steel ball of radius 0.85mm falls ...
  95. please!

    ok i REALLY am stumped. please help! it is a sequence problem here is the problem.... 120,60,30 __, __, __. if you could give me the rule for this problem and the next 3 numbers that would be so great!!!!!!

    I'm really, really, really, sorry but I seriously need help. I can't find a TIMELINE of George Vancouver's special journeys and events. PLEASE HELP ME!!! IT WILL MEAN SO MUCH TO ME!
  97. us history

    what lasting influence did Thomas Jefferson have upon the American political traditions Hi i need a lot lot lot of information please please help me.
  98. science Opinions

    i need some of your opinions on this question: how will gasoline being replaced with biofuel from garbages affect you peronally? please write your opinions please
  99. Math

    Help Please! The LCM of two numbers is 60. The GCF of the numbers is 5. One number is 5 more than the other. The numbers are________ and __________ Please help clueless in Massachusetts
  100. Physics/ Chemistry please help

    The active ingredient in the allergy medication Claritin contains carbon (C), hydrogen (H), chlorine (Cl), nitrogen (N), and oxygen (O). Its molecular formula is C22H23ClN2O2. The standard adult dosage utilizes 1.480 1019 molecules of this species. Determine the mass (in grams...
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