physics please HELP !

130,011 results, page 38

  1. Physics please HELP

    What is the ratio of the spin angular momentum of the Earth and its orbital angular momentum about the Sun. The mean radius of the earth is R_earth = 6400 km. The radius of the Earth's orbit is r_s = 1.5 * 10^8 km. For simplicity you may assume that the mass of the Earth is ...
  2. Physics

    A wheel of moment of inertia 0.136 kg · m2 is spinning with an angular speed of 5000 rad/s. A torque is applied about an axis perpendicular to the spin axis. If the applied torque has a magnitude of 67.8 N · m, the angular velocity of precession will be? Please help me solve...
  3. physics

    Can someone please help me? I am having a really hard time with physics. This is not a test question. It is a practice problem from a review website I am supposed to use, but I am having a really hard time. Can someone at least help me to begin setting up the problem? I would ...
  4. physics

    1.Distinguish between atomic physics and nuclear physics? 2.Briefly describe the Bohr model of the atom. What is Bohr’s key idea (involving matter waves) that makes the Bohr atom have discrete energy levels? I really didn't understand what they were wanting, so many of ...
  5. Diabetes

    Can someone please name 2 methods of treatment for diabetes, please? Danke!
  6. Math 116 algebra please check

    Simplify 6[-73-(-19-83)]=174 Please check
  7. science help please

    i don't understant what sexual reproduction is and what asexual reproduction is could please help me understand
  8. history.

    evaluate how the age of enligtenment is a response to the age of absolutism. help please. please.
  9. history.

    evaluate how the age of enligtenment is a response to the age of absolutism. help please. please.
  10. Spanish-Please check

    Please check-Thank you I come from the library. Yo vengo de biblioteca.
  11. integral Calculus

    Please help me with this integral problem: ʃ x^2(a^2-x^4)^2dx please help..thanks alot:)
  12. science

  13. maths

    the 8th term of an a.p is 37 and 12th term is 57 .find the a.p please help this questions .please help.
  14. calc

    integral (x^2+x-1)/(x+1) dx can you please explain maybe not step by step but not just the answer please thanks
  15. mathURGENT!!!!!!!

    if (4^x)-(4^x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????
  16. mathURGENT!!!!!!!!!!

    if 4^(x)-4^(x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????
  17. Physics

    An alloy of iron and silver has a total mass of 30 grams and a volume of 20.4 centimetre cube Calculate the mass of iron only and the volume silver only Please help
  18. 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 recommend I research and what...
  19. university physics

    It is proposed that future space stations create an artificial gravity by rotating. Suppose a space station in constructed as a 1170.0 m diameter cylinder that rotates about its axis. The inside surface is the deck of the space station. What rotation period (in s) will provide...
  20. Physics- Elena please help!

    A 2300. kg car starts from rest and accelerates uniformly to 24.0 m/s in 24.0 s. Assume that air resistance remains constant at 510 N during this time. Find (a) the net force on the car b) the average power developed by the engine? c) the instantaneous power output of the ...
  21. Physics! Please help!!

    HELP!! Two blocks of mass m1 = 320 g and m2 = 725 g are pushed by a force. The coefficient of kinetic friction between each block and the ground is 0.4. The blocks move together (with one pushing the other) with an acceleration of 225 cm/s2. What is the value of the applied ...
  22. Science

    I am working on a year 10 physics assignment on road science. I am trying to figure out the reaction distance of a car with: Skid marks = 24m Reaction time = 1 sec Decelaration rate = 6m/sec I have many formulas in my book and am unsure of which one to use and what the correct...
  23. Physics

    Please help me with this problem. The standard source for radiation therapy was radioactive 60Co which decays with a halflife of 5.27y, into an excited nuclear state of 60Ni. That nickel isotope then immediately emits two gamma ray photos wach with energy of 1.2 MeV. How many ...
  24. Physics

    A block of weight 3.8N is launched up a 30 degree inclined plane of length 2.25m by a spring with spring constant 2.35kN/m and maximum compression 0.10m. The coefficient of kinetic friction is 0.50. How much kinetic energy does it have at the top of the incline? I get 2.4J am ...
  25. physics

    our class was given an extra credit assignment where we have to design a mobile that has both the net forces and torques = 0. i have all of the masses know i just don't know how to find radii. no two masses can be in the same position nor can they be at the center of mass...i;...
  26. physics

    A proton initially moves left to right long the x‑axis at a speed of 2 ´ 103 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.2 m before coming to rest. What acceleration magnitude does the proton experience? a...
  27. physics

    You tie a battery powered, fixed-frequency buzzer to the end of a string and swing it around in a large horizontal circle. Your friend stands well off to the right and listens to the tone. At which of the labeled locations will the buzzer be when your friend hears the highest ...
  28. Physics (Wave Force)

    An archer must exert a force of 445 N on the bowstring shown in Figure (a) such that the string makes an angle of è = 34.0° with the vertical. (a) Determine the tension in the bowstring. _____________________________________ My answer was 420.525, but it is within 10% of the...
  29. physics what am i doing wrong?

    Three masses are arranged in the (x, y) plane. 3kg (0,0) 7kg (10,0) 6kg (0,3) What is the magnitude of the resulting force on the 3 kg mass at the origin? The value of the universal gravitational constant is 6.6726 × 10^−11 N · m^2/kg^2. Answer in units of N what ive ...
  30. physics

    A tire placed on a balancing machine in a service station starts from rest and turns through 4.93 revolutions in 1.47 s before reaching its final angular speed. Calculate its angular acceleration. It must be in units of radians. Please help. I have 20 attempts to do this and I...
  31. As physics

    The drag force acting on a car travelling at a speed v is given by the equation F=kAv^2 Where A is the area of the front of the car. Show that a suitable unit for the quantity k is kgm-3. Mark scheme answer: F= kgms-2 or A=m2 V=ms-1 Which is K=kgm-3 I am confused could someone...
  32. As physics

    The drag force acting on a car travelling at a speed v is given by the equation F=kAv^2 Where A is the area of the front of the car. Show that a suitable unit for the quantity k is kgm-3. Mark scheme answer: F= kgms-2 or A=m2 V=ms-1 Which is K=kgm-3 I am confused could someone...
  33. Physics

    On a cold winter day, the outside temperature is –5.0 °C while the interior of a well-insulated garage is maintained at 20.0 °C by an electric heater. Assume the walls have a total area of 75 m2, a thickness of 0.15 m, and a thermal conductivity of 0.042 W/(m • C°). ...
  34. Science-Physics

    You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = .55. The force you exert is horizontal. (a) How much power is needed to push the box at a speed of .50 m/s? (b) How much work do you do if you push the box for 35 s? *please list the steps to...
  35. physics

    A simple harmonic oscillator consists of a 1.1 kg block attached to a spring (k = 180 N/m). The block slides on a horizontal frictionless surface about the equilibrium point x = 0 with a total mechanical energy of 3.0 J. (a) What is the amplitude of the oscillation? (b) How ...
  36. Physics as repost please answer and help

    Silver plating: A student attempts the process of silver plating to determine the mass of a silver atom. a series of objects are measured, then electroplated for a measure period of time, while maintaining a steady current through a solution of silver nitrate in tap water. ...
  37. Physics(Please help, thank you)

    I had to do an experiment where a tiny steel ball was measured using a micrometer. There was then a series of calculations that needed to be completed and then a percent error had to be calculated. I think that my data may be incorrect or maybe I am just not doing the ...
  38. Physics

    You have been asked to keep a 35.1 kilogram crate from sliding down a 50.03° incline. The coefficient of friction between the crate and the incline is 0.26, and it's on the surface of Mars (gravitational acceleration at the surface of Mars is 3.75 m/s^2). How much force must ...
  39. college physics

    An airport worker needs to make it across a luggage belt in order to retrieve a stuck suitcase. The belt is moving with 1.6 m/s, and the worker can run with v=1.7 m/s. If he wants to make it straight across the d=2.3 m wide belt, how long will it take for him to reach the ...
  40. Physics

    A bullet of mass 3.3 10-3 kg moving at 750 m/s impacts with a large fixed block of wood and travels 5 cm before coming to rest. Assuming that the deceleration of the bullet is constant, find the force exerted by the wood on the bullet? I am confused on how to do this last ...
  41. physics

    An electron is accelerated from rest to a velocity of 2.0x10^7 m/s. a) if the electron travelled 0.10m while it was being accelerated, what was its acceleration? b)How long did the electron take to attain its final velocity? Please correct me if I'm wrong but I believe the ...
  42. physics

    A 220-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 26.6° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.863, and the log has an acceleration of 0.856 m...
  43. physics

    In an Atwood machine m1 = 2.00 kg and m2 = 6.50 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is released with a sharp push that sets it into motion at vi = 2.20 m/s ...
  44. physics Important please

    A metal wire has a resistance of 8.00Ω at a temperature of 20C. If the same wire has a resistance of 8.40Ω at 70C, what is the resistance of this wire in ohms when its temperature is −10C?
  45. Math

    A house is being renovated for $50,000. Right now the HST is 12% and is charged on all renovations. After April the HST will be gone and be replaced with PST of 7% and the GST of 6%. Renovations will only have to charge GST. How much money will the homeowner save if they wait ...
  46. Language Arts - Please Check Answer

    Please help me with the following question: A paradox is a literary device often used to A. emphasize or make readers think about important ideas. B. provide hints or clues about events that occur later in a story. C. explain a character’s reason for doing or saying ...
  47. Homework

    How can I get help with my homework. Please remember these things: 1. This is a homework help website; please put your subject (math, science, English, or ??) in the subject line to make it faster for each teacher to find those questions in his/her areas. An even better ...
  48. Calculus

    A road perpendicular to a highway leads to a farmhouse located 6 mile away. An automobile traveling on the highway passes through this intersection at a speed of 55mph. How fast is the distance between the automobile and the farmhouse increasing when the automobile is 2 miles ...
  49. Physics

    A 13 kg bucket of water is attached toa rope that is wound around a cylinder whose radius is 10.3 cm. A crank with a turning radius of 44.6 cm is attached to the cylinder. If the bucket accelerates upwards at a rate of 1.21 m/s^2, then how much tension is on the rope? Again, ...
  50. college physics help please...

    The location of the center of mass of the partially eaten, 11 inch diameter pizza (r = 5.5) shown in Figure 9-20 is Xcm = -1.1 in. and Ycm = -1.1 in. Assuming each quadrant of the pizza to be the same, find the center of mass of the uneaten pizza above the x axis (that is, the...
  51. physics

    please check this: When a glass rod is rubbed with silk and becomes positively charged, a. electrons are removed from the rod b. protons are removed from the silk c. protons are added to the silk d. the silk remains neutral A Charge is most easily transferred in a. ...
  52. physics :thinking check please

    I think that: psi= A sin kx; is a solution to Schrodinger's time independent eqn for a particle confined: a) within an infinite pot well, and b) within the walls of a finite well;but psi= B exp(-kx) would only be a solution for outside the walls of a finite well. Am I close? ...
  53. Physics ang. momentum

    A diver can reduce her moment of inertia by a factor of about 3.5 when changing from the straight position to the tuck position. If she makes 2.0 rotations in 1.5s when in the tuck position, what is the percent change in her kinetic energy as she changes to the straight ...
  54. physics

    Help me with this problem i do not get it? A light wave can travel the earth to the moon in 1.3 s. the distance to the moon is 384,790 km. how long would it take a sound wave to travel the same distance at 343 m/s? state you answer in days. I got 2 days but i really think its ...
  55. physics

    -Suppose that a person is standing on the edge of a cliff 50 m high, so that the ball in his/her hand can fall to the base of the cliff. Questions (a)-How long does it take to reach the base of the cliff? (b)- What is the total distance traveled by the ball? Attempted Answers...
  56. english

    Can I please, please get some websites that will show me the local government structure of dekalb county (atlanta, georgia), and, political issues concerning dekalb county. This is stuff I need for my paper, I've been searching google all day, but nothing sticks out. Please ...
  57. True & False explanations Physics

    When a projectile is fired at 45 deg. angle and is in free fall, the only point along the path that the acceleration of the object is zero is the instant when the object is at the highest point of its path. Answer: False Can someone explain how? 2.) An object with acceleration...
  58. physics

    The human eye is sensitive to electromagenetic waves that have wavelengths in the range from 400nm to 700nm (1nm=10^-9m). What range of the frequencies of electromagentic radiation can the eye detect? Can you please show me the steps and work because i don't understand what i ...
  59. Physics - check my work

    A cannon is fired from a cliff 190 m high downward at an angle of 38o with respect to the horizontal. If the muzzle velocity is 41 m/s, what is its speed (in m/s) when it hits the ground? Please check my work. I think it’s wrong, but I don’t know where I’m messing up… ...
  60. Physics

    A plumb bob does not hang exactly along a line directed to the center of the Earth's rotation. How much does the plumb bob deviate from a radial line at 38.5° north latitude? I got my answer to be 0.122288439 deg but it was incorrect. I used theta= a(sin 38.5)/g (which ...
  61. PHYSICS - please check my work

    a spectator at a hockey game is sitting in a seat situated 10.4m above ground leve. if the spectator has a mass of 52.6 kg, calculate her gravitational potential energy relative to: a)ground level Eg=mgh =52.6X9.8X10.4 =5360.99J b)the ice surface Eg=mgh =52.6X9.8X13.2 =6804J
  62. Physics

    Two Diamonds begin a free fall from rest from the same height, 1.0 s apart. How long after the first diamond begins to fall will the two diamonds be 10m apart? Please help, I am very confused with this question, I have completed all other but I am unsure about how to answer ...
  63. Physics, Please Help

    A 5.7 cm thick layer of oil (n=1.46) is sandwiched between a 1.1cm-thick sheet of glass and a 2.5cm -thick sheet of polystyrene plastic (n=1.59). How long (in nm) does it take light incident perpendicular to the glass to pass through this 9.3cm -thick sandwich? I cant seem to ...
  64. Physics-can someone please check this

    John is fired horizontally from a cannon with the speed of 24.5 m/s. In 3.0 seconds he strikes the earth down range. A net will be located on the ground to catch him. a) what is his initial position above the ground? b) What is the horizontal range to put the net? a)+ upward ...
  65. Physics

    Five moles of an ideal gas are compressed isothermally from A to B, What is the work involved if the temperature of the gas is 332 K? Be sure to include the correct algebraic sign. GRAPH: wvw.webassign.n3t/cj8/15-fc-009.gif wvw and n3t need to be retyped in their proper form ...
  66. Physics HELP!!

    A tire of radius 34.3 cm turns at 575 rpm. a) What arc length does a point on the tread of the tire travel in 1.00 minute (answer in radians)? b) What is the angular speed of the tire in rad/sec? c) There is a valve-stem located 23.5 cm from the center axis of the tire. What ...
  67. Social Studies 7R (Please Read!)

    Please check my homework I have to read each statement and determine if it's federalist or Democratic Republican 1. F - The role of government should be limited 2. DR - The economy should focus on farming 3. F - No one person should have too much power 4. F - There should be a...
  68. physics

    Hi: We have a homework problem that I have no idea even how to set up! please help! "A man jogs at a speed of 1.3 m/s. His dog waits 1.4s then takes off running at a speed of 2.8 m/s to catch the man. How far will they have to travel before the dog watches up with the man? ...
  69. physics

    Hi: We have a homework problem that I have no idea even how to set up! please help! "A man jogs at a speed of 1.3 m/s. His dog waits 1.4s then takes off running at a speed of 2.8 m/s to catch the man. How far will they have to travel before the dog watches up with the man? ...
  70. Physics repost please clarify

    The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding ...
  71. Physics please help!!

    A quarterback takes the ball from the line of scrimmage, runs backward for 11.1 yds, then runs sideways parallel to the line of scrimmage for 17.8 yds. At this point, he throws a 52.7 yd forward pass straight downfield, perpendicular to the line of scrimmage. What is the ...
  72. Please Please Help-Physics

    I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
  73. criminal law

    What impact do the media have on public opinion? On the roles and responsibilities of the attorneys in a trial? Does this media viewpoint accurately portray these professionals? Why or why not? Please what are your opinions on this please explain???
  74. R.E

    On the crossword, it says, Which 5 are letters out of these words: Corinthians, Galatians, Philippians, Revelation, Romans and Timothy. Please help and theres another two questions, How many are in the Old Testmant and New Testmant. Please help! Thanks
  75. Social Studies

    Could you please give me a link to facts on how to increase state jobs and money, and if you have any facts of your own you may write them also. Thanks please hurry because I'm going to go to sleep soon!
  76. history

    How did progressivism affect the role of the federal government in the early 1900s? please, please give me some good information to answer this qusetions..because i havne't found any good sites
  77. To Ms. Sue

    Ms. Sue could you please take a look at my previous post On English-Poetry. I'm supposed to make a list of 20 everday pleasures, which I did. Could you please see if they're good. Thank you very much for all your help:-)
  78. chem can u check answer please

    the solubility of silver sulfate in water is 0.223%(w/v) at 35 degrees celsius.calculate the solubility product of this salt at this temp. I got 1.46 X 10^-6 M is this right please thanks Andy
  79. Math algebra honours

    Can someone please answer my question it is the other one named algbra honurs i am kinda new to this website so i don't know if you postt it twice or not can someone please help thankyou
  80. Ms.Sue

    Sorry for asking the same question twice,I will go through it and provide a good answer.Please let me post though.Please give me the permission to post.I am the person who asked about the STI's.
  81. Spanish-7th grade-Please help

    I'm not sure what this is asking or how to answer it- ¿Qué prefiere llevar tu mamá? Is it asking what I prefer to take my mom? And how do I answer it? I'm really confused on the transalation Please give advice
  82. english

    please correct my grammar. thank you very much to you and your is willing to employ me. I hereby certify that the above information is true and correct to the best of my knowledge. please I need your advise or advice
  83. Chemistry PLEASE HELP!

    • A compound is known to contain only C, H, and N. • On combustion of a sample of 12.5 mg, 22.3 mg of CO2 and 15.2 mg of H2O were produced. •Use this data to find the empirical formula for the compound. (Please show working out)
  84. calculus--please help!!

    Solve the inequality. x^3+9x^2-108 less than or equal to 0. Then write in interval noation. Please can you show me step by step on how you got the answer. I have tries and I am very confused.
  85. chem

    Please help me balance this equation: I just can't get it right. Do you have any strategy you use to solve such equation balancing if so please help me. Ba(ClO3)2(aq)+ Na3PO4(aq)-> Ba3(PO4)2(s)+NaClO3(aq) Thanks alot!!:)
  86. Math

    Please please help!!!!! Solve the inequality and write the solution set in interval notation 4x^3 -6x^2<0 2x^2 (2x-3)<0 2x-3<0 x= 3/2 Now I'm not sure about this 2x^2<0 x^2<1/2 sq root of x^2<sq root of 1/2 x=.7071 Right? When I plug it in the calculator it ...
  87. Chemistry: Conversion

    What's the formula to convert 7 square yards to square meters. May you please show me a website to help with converting or anything? I keep forgetting, and I'm kind of a slow scholar, so please bear with me...
  88. algebra - please help!

    Liam is single. He has no children and an adjusted income of $26,700. Find his income tax. A. $1,735 B. $2,185 C. $2,732.50 D. $1,835 Please walk me through on how you got the answer..
  89. Chemistry

    what volume of 0.120 M NaOH must be added to 100 ml of 0.100 M NaHC2O4 to reach ph of 4.70? H2C2O4 Ka1 = 5.9 x 10-2 HC2O4^- Ka2 = 5.1 x 10-5 The answer is 60 ml but I don't know how to find it. Can you please show me the steps and how to do it please
  90. U.S history

    Compare and contrast the US involvement in the korean and the Vietnam war. Include two similarities and two differences. Can someone please please help me? I honestly remember nothing about these wars.
  91. english

    Please help me on this homework cause am lost and this coming moday I must present it;"English is the language of opportunity.Why bother to teach indigenous languages?"....please..I don't know how or where to start writting (introduction and body)...
  92. Math Help, Check My Answers Please

    Please check my answer, I wanna make sure I get it right. 4.Personal bias can cause a scientist to misinterpret an observation or the results of an experiment. True False*****
  93. Math

    1. Which equation below matches the relationship shown in the table? Table- X: 0, 1, 2 Y: 0.5,3.5, 6.5 A. y=2x+0.5 B. y=2x+2 C. y=3x D. y=3x+0.5 Please help, thank you. BTW I would share my answer for anyone to check but I am not sure how to do this so please give the process...
  94. math - standard form

    please could you check the first 2 then explain the method on the other 2 1)5.2x10^6 + 3x10^5 5200000+300000=5500000 5.5x10^6 2)4.2x10^5 + 1.28x10^6 420000+1280000=1700000 1.7x10^6 method please 3)6.5x10^-3 - 3.5x10^-9 0.065-0.000000035=0.064999965 how do you convert this ...
  95. Chemistry

    Please help verify my answer. Not confident it is right: please verify my answer: Consider the following REDOX reaction: Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) a. Write the oxidation and reduction half-cell reactions. Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb...
  96. Chemistry

    Please help verify my answer. Not confident it is right: please verify my answer: Consider the following REDOX reaction: Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb(s) a. Write the oxidation and reduction half-cell reactions. Zn(s) + Pb+2(aq) �� Zn+2(aq) + Pb...
  97. Physics please clarify

    A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.135 m). The charges on the circle are -3.20 µC at the position due north and +5.00 µC at the position due east. What is the magnitude and ...
  98. Physics

    A pole-vaulter of mass 59.9 kg vaults to a height of 5.9 m before dropping to thick padding placed below to cushion her fall. (a) Find the speed with which she lands. m/s (b) If the padding brings her to a stop in a time of 0.48 s, what is the average force on her body due to ...
  99. Physics

    A small, single engine airplane is about to take off. The airplane becomes airborne, when its speed reaches 117.0 km/h. The conditions at the airport are ideal, there is no wind. When the engine is running at its full power, the acceleration of the airplane is 2.40 m/s2. What ...
  100. easy math question, im just dumb, please help ASAP

    DESCRIBE AND CORRECT THE ERROR IN THIS EQUIVALENT RATIO THINGY PLEASE 14 times/day X 1 week/7 days = 2 times/ week I think the answer is 14 times/day x 1 TIME/ 7 days = 2 times/DAY (I capitalized what i corrected, am I right or not? if I'm not, please correct me ASAP
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